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  • Probing the parallel dimension

    From Louis Ohland@21:1/5 to Louis Ohland on Fri Feb 10 07:28:14 2023
    Might be an eggcellent opportunity to painfully probulate the Model 90
    type 3 parallel port.

    Louis Ohland wrote:
    My year old Brittany has been desperate to find things to fetch lately.
    He's taken some things off my desk downstairs. Finally had to clear up
    some of the drifts of mail... And what do we have here?

    Might be a somewhat slow solution to my chicken and egg problem. I'll be assembling a page on it with manuel, NT, 95/98, W2k drivers.

    I tried the later version and it blue screened my 90... Had to destroy
    the 'ville in order to save it.

    --- SoupGate-Win32 v1.05
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  • From Louis Ohland@21:1/5 to Tomas Slavotinek on Fri Feb 10 11:51:18 2023
    So why does software choke on an arbitrated parallel port? Riddle me that...

    Tomas Slavotinek wrote:
    On 10.02.2023 14:28, Louis Ohland wrote:
    Might be an eggcellent opportunity to painfully probulate the Model 90
    type 3 parallel port.

    Well, except for the "Reserved" but clearly connected pin 12, there
    isn't much to probulate there...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Tomas Slavotinek@21:1/5 to Louis Ohland on Fri Feb 10 18:27:56 2023
    On 10.02.2023 14:28, Louis Ohland wrote:
    Might be an eggcellent opportunity to painfully probulate the Model 90
    type 3 parallel port.

    Well, except for the "Reserved" but clearly connected pin 12, there
    isn't much to probulate there...

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Tomas Slavotinek@21:1/5 to Louis Ohland on Fri Feb 10 21:29:58 2023
    On 10.02.2023 18:51, Louis Ohland wrote:
    So why does software choke on an arbitrated parallel port? Riddle me
    that...

    Eh, disregard my comment about the pin 12 oddity, that of course relates
    to the previously discussed 25-pin SERIAL port. Confirmation bias...

    Anyway, there are a few potential problems with the DMA parallel port
    (not exclusive to Model 90):
    -the connected device does not understand the protocol
    -low-level software/driver incompatibility
    -configuration/user error (setting the link to ECP or EPP...)

    But data transfers between two PS/2s with Type 3 controllers should be relatively trouble-free and pretty fast too!

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Louis Ohland@21:1/5 to Tomas Slavotinek on Fri Feb 10 15:53:42 2023
    https://www.ardent-tool.com/comms/New_Developments_Parallel_Ports.html

    DMA Mode PS/2 Connections

    If two PS/2s are to transfer data using the DMA mode, their two parallel
    ports should be connected in the manner shown in Figure 3. This
    particular configuration allows the two parallel-port controllers to
    produce the proper handshaking for the DMA transfer.

    So connected, a pair of PS/2s using their DMA parallel ports can
    transfer data at up to 2MB per second, a transfer rate rivaling that of
    some hard disk contro

    Tomas Slavotinek wrote:
    But data transfers between two PS/2s with Type 3 controllers should be relatively trouble-free and pretty fast too!

    --- SoupGate-Win32 v1.05
    * Origin: fsxNet Usenet Gateway (21:1/5)
  • From Christian Holzapfel@21:1/5 to Louis Ohland on Sat Feb 11 09:59:32 2023
    Louis Ohland schrieb am Freitag, 10. Februar 2023 um 18:50:49 UTC+1:
    So why does software choke on an arbitrated parallel port? Riddle me that...

    At least my P70 does not assign any IRQ to LPT1 - not the common no. 7, and no other. Makes it hard to use the Xircom Pocket Ethernet for example, having W95 drivers demaning the interrupt.
    So there seem to be strange implementations out there.

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