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  • Re: 4755 snippets in 4753-14 Service Manual CUSTMSTR.BOO

    From Louis Ohland@21:1/5 to Louis Ohland on Wed Oct 12 11:09:52 2022
    Is the 4753 like the 3172, where it uses a 95 planar and complexi?

    Louis Ohland wrote:
    ROM module, security switch. battery replacement.

    Better than nothing.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Wed Oct 12 10:56:06 2022
    ROM module, security switch. battery replacement.

    Better than nothing.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From RickE@21:1/5 to Louis Ohland on Sun Oct 16 01:26:54 2022
    On Wednesday, October 12, 2022 at 12:09:47 PM UTC-4, Louis Ohland wrote:
    Is the 4753 like the 3172, where it uses a 95 planar and complexi?

    I don't know, I never saw a 4753. I shifted from processors to printers in 1989 and didn't return to mainframes until the summer of 2005.

    --- SoupGate-Win32 v1.05
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  • From RickE@21:1/5 to All on Sun Oct 16 03:13:59 2022
    It's unclear to me whether you found the 4753-014 Service Manual or not, but I found a copy in my archives. I'll put it on my Google Drive for a short time.

    https://drive.google.com/file/d/1zACCPbZR0Pp6uApXvhRLFQVd4PCkhLbn/view?usp=sharing

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Sun Oct 16 09:02:30 2022
    5.3.2.3 Removing and Replacing the Cryptographic Adapter ROM Module




    | To remove and replace the cryptographic adapter ROM module (part
    number | 11H0381 for a 4753 at Control Program Version 3.00 and number
    41H6783 for | Version 3.10)

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Sun Oct 16 09:00:15 2022
    A.2 4753 Cryptographic Hardware Diagnostic Runtime Error Codes



    A runtime error code is a 2-digit number that appears on a 4707
    display screen while the 4753 cryptographic hardware diagnostics are
    running. (A system error code is a 4-digit hexadecimal number that
    appears on the 4753 operator panel. For information about the system
    error codes, see the | 3172 Interconnect Controller Status Codes manual.)Figure A-2 describes the 4753 cryptographic hardware diagnostic
    runtime error codes. | Perform actions in order until the problem
    is corrected. If the problem | can not be corrected, contact 4753 level
    2 support.




    ________________________________________________________________________
    | Figure A-2. 4753 Cryptographic Hardware Diagnostic Runtime Error
    |
    | Codes
    |
    |_________________ ___________________________
    __________________________|
    | Code | Description | Action
    |

    |_________________|___________________________|__________________________|
    | | 11 | The cryptographic adapter | 1. Replace the |
    | | | failed. | cryptographic |
    | | | | adapter. For |
    | | | | procedures, see |
    | | | | "Servicing the
    |
    | | | | Cryptographic
    |
    | | | | Adapter and
    |
    | | | | Associated
    Hardware" |
    | | | | in topic 5.3.2.
    |
    | | |
    |
    | | | | 2. Replace system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 12 | The cryptographic adapter | 1. Check the |
    | | | driver is not installed. | cryptographic |
    | | | | adapter in slot 2 in |
    | | | | the 4753. |
    | | |
    |
    | | | | 2. Install or replace |
    | | | | the cryptographic |
    | | | | adapter. For |
    | | | | procedures, see |
    | | | | "Servicing the
    |
    | | | | Cryptographic
    |
    | | | | Adapter and
    |
    | | | | Associated
    Hardware" |
    | | | | in topic 5.3.2.
    |
    | | |
    |
    | | | | 3. Replace the system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 13 | The 4754 is not | 1. Check the 4754. |
    | | | installed. | |
    | | | | 2. Check the 4754 |
    | | | | communications |
    | | | | cable. |
    | | |
    |
    | | | | 3. Go to "MAP 0180:
    |
    | | | | System Problem
    |
    | | | | Isolation" in
    |
    | | | | topic 3.1.6.
    |

    |_________________|___________________________|__________________________|
    | | 14 | The cryptographic adapter | 1. Check slot 2 in the |
    | | | or the 4754 cannot be | 4753. |
    | | | found. | |
    | | | | 2. Check the cables |
    | | | | that connect the |
    | | | | 4754 to the 4753. |
    | | |
    |
    | | | | 3. Replace |
    | | | | cryptographic |
    | | | | adapter. |
    | | |
    |
    | | | | 4. Replace 4754. |

    |_________________|___________________________|__________________________|
    | | 15 | You are not authorized to | Get an authorized |
    | | | run the 4754 tests. | Personal Security card. |

    |_________________|___________________________|__________________________|
    | | 20 | A status error occurred | 1. Press the correct |
    | | | in the 4754 keypad. | key on the keypad. |
    | | |
    |
    | | | | 2. Go to "MAP 0170:
    |
    | | | | Error Code 28, 29,
    |
    | | | | or 60" in
    |
    | | | | topic 3.1.5.
    |

    |_________________|___________________________|__________________________|
    | | 28 | Either the Personal | Go to "MAP 0170:
    Error |
    | | | Security card failed or | Code 28, 29, or 60" in
    |
    | | | the 4754 failed. | topic 3.1.5.
    |

    |_________________|___________________________|__________________________|
    | | 29 | The Personal Security | Go to "MAP 0170:
    Error |
    | | | card failed. | Code 28, 29, or 60" in
    |
    | | | | topic 3.1.5.
    |

    |_________________|___________________________|__________________________|
    | | 31 | The service switch is set | This is an informational |
    | | | on the cryptographic | message. A security |
    | | | adapter. | officer will reset the |
    | | | | switch when you release |
    | | | | the 4753. |

    |_________________|___________________________|__________________________|
    | | 60 | A communication error | Go to "MAP 0170:
    Error |
    | | | occurred with the 4754. | Code 28, 29, or 60" in
    |
    | | | | topic 3.1.5.
    |

    |_________________|___________________________|__________________________|
    | | 7A | A status error occurred | Set the service switch |
    | | | in the service switch. | to OFF, and power off |
    | | | | and on the 4753. If |
    | | | | problem continues, Go to |
    | | | | "MAP 0180: System
    |
    | | | | Problem Isolation" in
    |
    | | | | topic 3.1.6.
    |

    |_________________|___________________________|__________________________|
    | 7B | An error occurred when | Replace the
    |
    | | the power to the | cryptographic
    adapter. |
    | | cryptographic adapter was | For procedures, see
    |
    | | switched on. | "Servicing the
    |
    | | | Cryptographic Adapter
    |
    | | | and Associated
    Hardware" |
    | | | in topic 5.3.2.
    |

    |_________________|___________________________|__________________________|
    | 7C | A time-out error occurred | Replace the
    |
    | | when the power to the | cryptographic
    adapter. |
    | | cryptographic adapter was | For procedures, see
    |
    | | switched on. | "Servicing the
    |
    | | | Cryptographic Adapter
    |
    | | | and Associated
    Hardware" |
    | | | in topic 5.3.2.
    |

    |_________________|___________________________|__________________________|
    | 7D | An error occurred during | Replace the
    |
    | | the cryptographic adapter | cryptographic
    adapter. |
    | | power-on diagnostic test. | For procedures, see
    |
    | | | "Servicing the
    |
    | | | Cryptographic Adapter
    |
    | | | and Associated
    Hardware" |
    | | | in topic 5.3.2.
    |

    |_________________|___________________________|__________________________|
    | 7E | An unknown error occurred | Replace the
    |
    | | during the cryptographic | cryptographic
    adapter. |
    | | adapter power-on | For procedures, see
    |
    | | diagnostic test. | "Servicing the
    |
    | | | Cryptographic Adapter
    |
    | | | and Associated
    Hardware" |
    | | | in topic 5.3.2.
    |

    |_________________|___________________________|__________________________|

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    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to RickE on Sun Oct 16 08:55:47 2022
    Looks to be '95. My guess looks to be richtig, 3172 and 4753 share same chassis.

    2.1 Preparing to Install a 4753

    Before you install a 4753, complete the following tasks:
    Read these procedures.
    Become familiar with the following publications:
    | 3172 Interconnect Controller Model 3 Maintenance Information | manual
    | 3172 Interconnect Controller Model 3 Diagnostics Guide, GA27-4063
    | 3172 Interconnect Controller Model 3 Channel Adapters Supplement | to Maintenance Information,GA27-4050
    | 3172 Interconnect Controller Model 3 LAN Adapters Supplement to | Maintenance Information, GA27-4020
    | 3172 Interconnect Controller Model 3 Auxilliary Adapters | Supplement
    to Maintenance Information, GA27-4053
    | 3172 Interconnect Controller Status Codes, GA27-3951
    9309 Rack Enclosure Setup and Operation Guide
    Transaction Security System General Information Manual and Planning
    Guide, Chapter 4, "Site Preparation"
    4753 Network Security Processor Model 14 Installation and Operating Guide

    RickE wrote:
    It's unclear to me whether you found the 4753-014 Service Manual or not, but I found a copy in my archives. I'll put it on my Google Drive for a short time.

    https://drive.google.com/file/d/1zACCPbZR0Pp6uApXvhRLFQVd4PCkhLbn/view?usp=sharing


    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Sun Oct 16 08:58:44 2022
    A.1 4753 Cryptographic Hardware Diagnostic Startup Error Codes



    A startup error code results from an error that the 4753 cryptographic hardware diagnostics detect when they are starting up and checking the
    position or the identification of an adapter in the 4753. Figure A-1
    describes the cryptographic hardware diagnostic startup error codes.
    | Perform actions in order until the problem is corrected. If the
    problem | can not be corrected, contact 4753 level 2 support.




    ________________________________________________________________________
    | Figure A-1. 4753 Cryptographic Hardware Diagnostic Startup Error
    |
    | Codes
    |
    |_________________ ___________________________
    __________________________|
    | Code | Description | Action
    |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 001 | The diagnostics have | 1. Check slot 2 in the |
    | | | detected a missing or | 4753 to ensure that |
    | | | incorrectly installed | the cryptographic |
    | | | cryptographic adapter. | adapter is |
    | | | | installed. |
    | | |
    |
    | | | | 2. Replace |
    | | | | cryptographic |
    | | | | adapter. |
    | | |
    |
    | | | | 3. Replace system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 002 | An unknown adapter is | 1. Remove it and run |
    | | | installed in the 4753. | the systems |
    | | | | diagnostics. |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 003 | The token-ring adapter is | 1. Check slot 7 in the |
    | | | installed incorrectly. | 4753 to ensure that |
    | | | | the token-ring |
    | | | | adapter is installed |
    | | | | correctly. |
    | | |
    |
    | | | | 2. Put it in the |
    | | | | correct slot and run |
    | | | | diagnostics. |
    | | |
    |
    | | | | 3. Replace the |
    | | | | token-ring adapter. |
    | | |
    |
    | | | | 4. Replace the system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 004 | The PS channel adapter is | 1. Check slot 4 in the |
    | | | installed incorrectly. | 4753 to ensure that |
    | | | Put it in the correct | the channel |
    | | | slot and rerun the | interface adapter is |
    | | | systems diagnostics. | installed correctly. |
    | | |
    |
    | | | | 2. Put it in the |
    | | | | correct slot and run |
    | | | | diagnostics. |
    | | |
    |
    | | | | 3. Replace the PS |
    | | | | channel adapter. |
    | | |
    |
    | | | | 4. Replace the system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 005 | The cryptographic adapter | 1. Check slot 2 in the |
    | | | is installed incorrectly. | 4753 to ensure that |
    | | | Put it in the correct | the cryptographic |
    | | | slot and rerun the | adapter is installed |
    | | | systems diagnostics. | correctly. |
    | | |
    |
    | | | | 2. Put it in the |
    | | | | correct slot and run |
    | | | | diagnostics. |
    | | |
    |
    | | | | 3. Replace the |
    | | | | cryptographic |
    | | | | adapter. |
    | | |
    |
    | | | | 4. Replace the system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 006 | The XGA adapter is | 1. Check slot 5 in the |
    | | | installed incorrectly. | 4753 to ensure that |
    | | | Put it in the correct | the XGA adapter is |
    | | | slot and rerun the | installed correctly. |
    | | | systems diagnostics. | |
    | | | | 2. Put it in the |
    | | | | correct slot and |
    | | | | rerun diagnostics. |
    | | |
    |
    | | | | 3. Replace the XGA |
    | | | | adapter. |
    | | |
    |
    | | | | 4. Replace the system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 007 | The fixed-disk controller | 1. Check slot 8 in the |
    | | | card is installed | 4753. |
    | | | incorrectly. Put it in | |
    | | | the correct slot and | 2. Put it in the |
    | | | rerun the systems | correct slot and |
    | | | diagnostics. | rerun the systems |
    | | | | diagnostics. |
    | | |
    |
    | | | | 3. Replace the |
    | | | | fixed-disk adapter. |
    | | |
    |
    | | | | 4. Replace the system |
    | | | | board. |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 008 | Displays a list of the | 1. See the action in |
    | | | correct adapter slots: | this table for the |
    | | | | 4755CHKM error code |
    | | | 1 Token ring | that appears with
    |
    | | | 2 XGA adapter | this code.
    |
    | | | 3 Cryptographic |
    |
    | | | 4 PSCA |
    |
    | | | 8 Fixed disk |
    |
    | | |
    |
    | | | Note: This code appears |
    |
    | | | with error codes 4755CHKM | |
    | | | 001 - 007. | |

    |_________________|___________________________|__________________________|
    | | 4755CHKM 009 | The cryptographic adapter | 1. Check the |
    | | | ROM component is missing | cryptographic |
    | | | or may be installed | adapter. |
    | | | incorrectly. | |
    | | | | 2. Check the placement, |
    | | | | orientation and part |
    | | | | number of the ROM. |
    | | |
    |
    | | | | 3. Replace the ROM. |
    | | |
    |
    | | | | 4. Replace the |
    | | | | cryptographic |
    | | | | adapter. |
    | | |
    |
    | | | | 5. Replace the system |
    | | | | board. |

    |_________________|___________________________|__________________________|

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Sun Oct 16 09:10:22 2022
    93G3653 | 1 |   Cryptographic Adapter (4755 Full DES)
    93G3655 | 1 |   Cryptographic Adapter (4755 Commercial DES)
    11H0381 | 1 |    ROM Module (for Control Program 3.00) |
    41H6783 | 1 |    ROM Module (for Control Program 3.10) |

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Sun Oct 16 09:05:44 2022
    Figure 5-3. 4753 Cryptographic Adapter Jumpers






    ________________________________________________________________________
    | Figure 5-4. 4753 Cryptographic Adapter Jumpers When Shipped
    |
    |_________ __________ ____________________
    ______________________________|
    | | Number | |
    |
    | Jumper | of Pins | Name of Jumper | Jumper Status when
    Shipped |

    |_________|__________|____________________|______________________________|
    | CD4 | 3 | Battery retain | Shipped in position 1
    |

    |_________|__________|____________________|______________________________|
    | CD5 | 2 | Service switch | Installed
    |

    |_________|__________|____________________|______________________________|
    | CD6 | 3 | External battery | Shipped in position 1
    |

    |_________|__________|____________________|______________________________|
    | CD7 | 2 | Tamper test | Not shipped
    |

    |_________|__________|____________________|______________________________|
    | CD8 | 3 | FEPROM program | Shipped in position 2
    |

    |_________|__________|____________________|______________________________|




    Notes:



    Position 1 means that the jumper is installed over pin 1 and the center
    pin.
    Position 2 means that the jumper is installed over pin 2 and the center
    pin.
    The jumpers have the following functions:



    Battery retain (CD4) Determines whether the contents of the
    cryptographic adapter RAM are lost or retained:
    If the jumper is installed in position 1, the memory contents are lost
    if you unplug the cryptographic adapter.
    If the jumper is installed in position 2, the memory contents are
    retained if you unplug the cryptographic adapter.
    If the jumper is not installed, the memory contents are lost if you
    unplug the cryptographic adapter or if you switch off the power.
    Note: A memory content loss can cause inconsistent results;
    therefore, a jumper should be installed.


    Service switch (CD5) Determines whether the service switch was set to ON
    since the service switch flag was last reset. (The service switch flag
    is reset when a security officer uses the operations utility to reset
    the switch or when a cryptographic adapter is reinitialized.)


    External battery (CD6) The system currently ignores the position of the
    jumper; however, a jumper must be installed.


    Tamper test (CD7) This jumper is a manufacturing test point; for normal operations, the jumper must not be installed.


    FEPROM program (CD8) Determines whether the code in the loadable shield
    can be erased or changed:
    If the jumper is installed in position 1, the code in the loadable
    shield on the cryptographic adapter can be erased or changed.
    If the jumper is installed in position 2, the code in the | loadable
    shield on the cryptographic adapter cannot be erased | or changed.

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to Louis Ohland on Sun Oct 16 09:34:54 2022
    31F1713 is valid as well.

    Louis Ohland wrote:
    93G3653 |     1 |   Cryptographic Adapter (4755 Full DES)
    93G3655 |     1 |   Cryptographic Adapter (4755 Commercial DES)
    11H0381 |     1 |    ROM Module (for Control Program 3.00) |
    41H6783 |     1 |    ROM Module (for Control Program 3.10) |

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to All on Mon Oct 17 07:41:13 2022
    Figure 5-3. 4753 Cryptographic Adapter Jumpers


    4755 Cryptographic Adapter Jumpers

    | Number | |
    Jumper | of Pins | Name of Jumper | Jumper Status when Shipped
    CD4 | 3 | Battery retain | Shipped in position 1
    CD5 | 2 | Service switch | Installed
    CD6 | 3 | External battery | Shipped in position 1
    CD7 | 2 | Tamper test | Not shipped
    CD8 | 3 | FEPROM program | Shipped in position 2

    Notes:
    Position 1 jumper is over pin 1 and center pin.
    Position 2 jumper is over pin 2 and center pin.

    Jumper functions:

    CD4 Battery Retain Lose or Retain cryptographic adapter RAM:
    Position 1, memory contents lost if cryptographic adapter is unplugged. Position 2, memory contents retained if cryptographic adapter unplugged.

    If CD4 is not installed, memory contents are lost if you unplug the cryptographic adapter or if you switch off the power.

    Note: A memory content loss can cause inconsistent results;
    therefore, a jumper should be installed.


    CD5 Service switch Determines whether the service switch was set to ON
    since the service switch flag was last reset. (service switch flag reset
    when security officer uses operations utility to reset switch or when a cryptographic adapter is reinitialized.)


    CD6 External Battery Currently ignored; but a jumper MUST be installed.


    CD7 Tamper Test Manufacturing test point; Open for normal operations.


    CD8 EEPROM Program Erase or Change the code in the loadable shield:
    Position 1, code can be erased or changed.
    Position 2, code cannot be erased or changed.

    --- SoupGate-Win32 v1.05
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  • From JWR@21:1/5 to Louis Ohland on Mon Oct 17 20:53:11 2022
    On 17-10-2022 14:41, Louis Ohland wrote:
    Figure  5-3. 4753 Cryptographic Adapter Jumpers

    snip <

    CD8     | 3        | FEPROM program     | Shipped in position 2

    snip <

    CD8 EEPROM Program Erase or Change the code in the loadable shield:

    Is there a difference between a FEPROM and an EEPROM (except for a possible typo)?

    --
    Jelte,
    Admirer of the letter of IBM with blue Ishiki

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Tomas Slavotinek@21:1/5 to Louis Ohland on Mon Oct 17 21:41:49 2022
    On 17.10.2022 21:32, Louis Ohland wrote:
    I think it is a typo. EEPROM is my SWAG.

    JWR wrote:
    Is there a difference between a FEPROM and an EEPROM (except for a
    possible typo)?

    "FEPROM" is the old name for what we know as Flash memory. But I'm not
    sure if they meant Flash here, or if it's just a typo...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to JWR on Mon Oct 17 14:32:04 2022
    I think it is a typo. EEPROM is my SWAG.

    JWR wrote:
    Is there a difference between a FEPROM and an EEPROM (except for a
    possible typo)?

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From JWR@21:1/5 to Tomas Slavotinek on Mon Oct 17 22:10:40 2022
    On 17-10-2022 21:41, Tomas Slavotinek wrote:
    On 17.10.2022 21:32, Louis Ohland wrote:
    I think it is a typo. EEPROM is my SWAG.

    JWR wrote:
    Is there a difference between a FEPROM and an EEPROM (except for a possible typo)?

    "FEPROM" is the old name for what we know as Flash memory. But I'm not sure if they meant Flash here, or if it's just a typo...

    As these cards date from around '95, I don't think its a typo:

    Flash Erasable Programmable Read-Only Memory (storage)
    (FEPROM, "flash memory") A kind of non-volatile storage device similar to EEPROM, but where erasing can only be done in blocks or the entire chip.

    In 1995 this relatively new technology started to replace EPROMs because reprogramming could be done with the chip installed. At that time FEPROMs could be rewritten about 1000 times.

    Like EAPROM and ferro-magnetic material, FEPROMs rely on FN tunnelling. Some flash memory supports block erase.
    This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)


    --
    Jelte,
    Admirer of the letter of IBM with blue Ishiki

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to JWR on Tue Oct 18 12:04:38 2022
    What kind of voltages are needed? Can this be done on the 4755 or must
    the chip be removed and programmed on a programmer?

    JWR wrote:
    On 17-10-2022 21:41, Tomas Slavotinek wrote:
    On 17.10.2022 21:32, Louis Ohland wrote:
    I think it is a typo. EEPROM is my SWAG.

    JWR wrote:
    Is there a difference between a FEPROM and an EEPROM (except for a
    possible typo)?

    "FEPROM" is the old name for what we know as Flash memory. But I'm not
    sure if they meant Flash here, or if it's just a typo...

    As these cards date from around '95, I don't think its a typo:

    Flash Erasable Programmable Read-Only Memory (storage)
    (FEPROM, "flash memory") A kind of non-volatile storage device similar
    to EEPROM, but where erasing can only be done in blocks or the entire chip.

    In 1995 this relatively new technology started to replace EPROMs because reprogramming could be done with the chip installed. At that time
    FEPROMs could be rewritten about 1000 times.

    Like EAPROM and ferro-magnetic material, FEPROMs rely on FN tunnelling.
    Some flash memory supports block erase.
    This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)



    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Tomas Slavotinek@21:1/5 to Louis Ohland on Tue Oct 18 20:01:19 2022
    On 18.10.2022 19:04, Louis Ohland wrote:
    What kind of voltages are needed? Can this be done on the 4755 or must
    the chip be removed and programmed on a programmer?

    Early flash chips required higher programming voltage - 12 V usually.
    Since this thing dates back to 1989, it would have been designed with
    these older parts in mind. But I don't know if it can be programmed in
    place... It's hard to tell, as you don't need much hardware to implement
    this - just something to toggle the Vpp voltage and Write Enable line.
    The rest can be done purely in software.

    What is this ROM supposed to contain anyway? All the DES keys and
    algorithms are stored inside the secure metal can no doubt...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From schimmi@21:1/5 to Tomas Slavotinek on Tue Oct 18 13:38:17 2022
    Early EPROMs required even more programmable voltages (21V) and should not be confused with Flash chips (=electronically erasable, EEPROM).

    Tomas Slavotinek schrieb am Dienstag, 18. Oktober 2022 um 20:01:20 UTC+2:
    On 18.10.2022 19:04, Louis Ohland wrote:
    What kind of voltages are needed? Can this be done on the 4755 or must
    the chip be removed and programmed on a programmer?
    Early flash chips required higher programming voltage - 12 V usually.
    Since this thing dates back to 1989, it would have been designed with
    these older parts in mind. But I don't know if it can be programmed in place... It's hard to tell, as you don't need much hardware to implement
    this - just something to toggle the Vpp voltage and Write Enable line.
    The rest can be done purely in software.

    What is this ROM supposed to contain anyway? All the DES keys and
    algorithms are stored inside the secure metal can no doubt...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Tomas Slavotinek@21:1/5 to schimmi on Tue Oct 18 22:57:08 2022
    On 18.10.2022 22:38, schimmi wrote:
    Early EPROMs required even more programmable voltages (21V) and should not be confused with Flash chips (=electronically erasable, EEPROM).

    And Flash is a special case of EEPROM. "EEPROM evolved"...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From schimmi@21:1/5 to Tomas Slavotinek on Tue Oct 18 14:04:05 2022
    yip, you're right :)
    Tomas Slavotinek schrieb am Dienstag, 18. Oktober 2022 um 22:57:09 UTC+2:
    On 18.10.2022 22:38, schimmi wrote:
    Early EPROMs required even more programmable voltages (21V) and should not be confused with Flash chips (=electronically erasable, EEPROM).
    And Flash is a special case of EEPROM. "EEPROM evolved"...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)