Well, the 4216-020 could have it's main board swapped out with an -030
main board.

Anyone that can take feelthy-feely pictures of the -020 main board?

The -020 _MIGHT_ have been upgraded with an -030 as an RPO, I'm not
seeing an announcement letter. _BUT_ it was IBM, there is a 4216-030 on
VCF that started out as an -020, it was upgraded AND an -030 sticker was attached.

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

o 10 Mhz M68000 processor
o 0.5Mb program and 2.0Mb page buffer storage
o 16Kb EPROM including diagnostics and loader

"high-speed video interface"

- FIFO and serializer logic to convert the page image in RAM to a video
bit stream for transmission to the 4216 Model 020.

- An interface port between the M68000 and the Personal System/2. The interface consists of a modified parallel printer adapter design. This
is the only communication between the Adapter and the Personal System/2
with no processor memory space being used by the adapter.

This interface emulates the Personal System/2 printer port (i.e., LPT2)
when an ASCII printer emulator is loaded and can be accessed by normal
BIOS calls. It also can be switched to an alternate (high-speed) mode
that transfers data using a packet mode protocol. The interface also
allows bi-directional data transfer.

--- SoupGate-Win32 v1.05
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Rockwell R65NC22 P2 Versatile Interface Adapter (VIA)

Louis Ohland wrote:

o   10 Mhz M68000 processor
o   0.5Mb program and 2.0Mb page buffer storage
o   16Kb EPROM including diagnostics and loader

"high-speed video interface"

-  FIFO and serializer logic to convert the page image in RAM to a video
bit stream for transmission to the 4216 Model 020.

-  An interface port between the M68000 and the Personal System/2.  The interface consists of a modified parallel printer adapter design.  This
is the only communication between the Adapter and the Personal System/2
with no processor memory space being used by the adapter.

This interface emulates the Personal System/2 printer port (i.e., LPT2)
when an ASCII printer emulator is loaded and can be accessed by normal
BIOS calls.  It also can be switched to an alternate (high-speed) mode
that transfers data using a packet mode protocol.  The interface also
allows bi-directional data transfer.

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

http://www.bitsavers.org/components/rockwell/_dataBooks/1987_Rockwell_Controller_Products_Databook.pdf

pages 62-83

Louis Ohland wrote:

Rockwell R65NC22 P2 Versatile Interface Adapter (VIA)

Louis Ohland wrote:

o   10 Mhz M68000 processor
o   0.5Mb program and 2.0Mb page buffer storage
o   16Kb EPROM including diagnostics and loader

"high-speed video interface"

-  FIFO and serializer logic to convert the page image in RAM to a
video bit stream for transmission to the 4216 Model 020.

-  An interface port between the M68000 and the Personal System/2.
The interface consists of a modified parallel printer adapter design.
This is the only communication between the Adapter and the Personal
System/2 with no processor memory space being used by the adapter.

This interface emulates the Personal System/2 printer port (i.e.,
LPT2) when an ASCII printer emulator is loaded and can be accessed by
normal BIOS calls.  It also can be switched to an alternate
(high-speed) mode that transfers data using a packet mode protocol.
The interface also allows bi-directional data transfer.

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

https://eater.net/datasheets/w65c22.pdf

Louis Ohland wrote:

https://git.redump.net/mame/commit/?id=32f64dfce658fea5f3d8b9247055976b75020098

fix for the shift register's CB1 input synchronizer ?

+Apple continued sourcing VIAs from the same two manufacturers for the
Mac SE, though their ADB-era VIAs are newer CMOS models with a fix for
the shift register's CB1 input synchronizer which Apple may have
specifically requested. The new Rockwell version (R65NC22) is only
labeled with Apple part number 338-6523

Louis Ohland wrote:

http://www.bitsavers.org/components/rockwell/_dataBooks/1987_Rockwell_Controller_Products_Databook.pdf


pages 62-83

Louis Ohland wrote:

Rockwell R65NC22 P2 Versatile Interface Adapter (VIA)

Louis Ohland wrote:

o   10 Mhz M68000 processor
o   0.5Mb program and 2.0Mb page buffer storage
o   16Kb EPROM including diagnostics and loader

"high-speed video interface"

-  FIFO and serializer logic to convert the page image in RAM to a
video bit stream for transmission to the 4216 Model 020.

-  An interface port between the M68000 and the Personal System/2.
The interface consists of a modified parallel printer adapter
design. This is the only communication between the Adapter and the
Personal System/2 with no processor memory space being used by the
adapter.

This interface emulates the Personal System/2 printer port (i.e.,
LPT2) when an ASCII printer emulator is loaded and can be accessed
by normal BIOS calls.  It also can be switched to an alternate
(high-speed) mode that transfers data using a packet mode protocol.
The interface also allows bi-directional data transfer.

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

https://git.redump.net/mame/commit/?id=32f64dfce658fea5f3d8b9247055976b75020098

fix for the shift register's CB1 input synchronizer ?

+Apple continued sourcing VIAs from the same two manufacturers for the
Mac SE, though their ADB-era VIAs are newer CMOS models with a fix for
the shift register's CB1 input synchronizer which Apple may have
specifically requested. The new Rockwell version (R65NC22) is only
labeled with Apple part number 338-6523

Louis Ohland wrote:

http://www.bitsavers.org/components/rockwell/_dataBooks/1987_Rockwell_Controller_Products_Databook.pdf

pages 62-83

Louis Ohland wrote:

Rockwell R65NC22 P2 Versatile Interface Adapter (VIA)

Louis Ohland wrote:

o   10 Mhz M68000 processor
o   0.5Mb program and 2.0Mb page buffer storage
o   16Kb EPROM including diagnostics and loader

"high-speed video interface"

-  FIFO and serializer logic to convert the page image in RAM to a
video bit stream for transmission to the 4216 Model 020.

-  An interface port between the M68000 and the Personal System/2.
The interface consists of a modified parallel printer adapter design.
This is the only communication between the Adapter and the Personal
System/2 with no processor memory space being used by the adapter.

This interface emulates the Personal System/2 printer port (i.e.,
LPT2) when an ASCII printer emulator is loaded and can be accessed by
normal BIOS calls.  It also can be switched to an alternate
(high-speed) mode that transfers data using a packet mode protocol.
The interface also allows bi-directional data transfer.

--- SoupGate-Win32 v1.05
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https://repository.rice.edu/bitstreams/1e0edebf-f0de-4f73-8092-cd8038912e11/download

pages 17-18

2.6.6 A Special Characteristic of the R6522
The R6S22 Versatile Interface Adapter was actually originally designed
to be used with the 6500 family of microprocessors. One of the major characteristics of the 6500 family is that the control and address
busses are always driven. They are never allowed to float.

During testing of the prototype microprocessor board the R6522s were
found to exhibit strange behavior. The parallel output lines would
change states randomly when the processor executed the STOP instruction,
which floats the address, data and control lines. At first the problem
was unclear, as some chips exhibited this phenomena, and others worked correctly. The outputs would sometimes change several seconds after the
STOP instruction had been executed. This behavior was very mysterious,
since the devices changed their outputs despite the fact that their chip selects were negated. After much experimenting it was discovered that in certain circumstances it was possible to change the outputs by shorting
the floating address lines to ground.

At this point die manufacturer was contacted, and an application
engineer explained politely that this was an undocumented feature of the
part However, Rockwell had sold the R6S22 to Apple for use in the
Macintosh, and during that transaction a Rockwell engineer discovered
that pull-up resistors on the address bus fixed the problem. Rockwell
also decided to fix the part The new part is called the R65NC22. The microprocessor board has pull-ups allowing original R6S22 parts to be
used, although all the systems built contain the new part

--- SoupGate-Win32 v1.05
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