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.

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.

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.

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.

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.

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.

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

Sounds Image Adapter/A like. "high-speed video interface"

Louis Ohland wrote:
> 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

Ooohh..

Louis Ohland wrote:
> Sounds Image Adapter/A like. "high-speed video interface"
>
> Louis Ohland wrote:
>> 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

A dual-port FIFO memory with unlimited expansion capability

Published in: Electronics and Power ( Volume: 31, Issue: 11.12,
November-December 1985)

Louis Ohland wrote:
> Ooohh..
>
> Louis Ohland wrote:
>> Sounds Image Adapter/A like. "high-speed video interface"
>>
>> Louis Ohland wrote:
>>> 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

The main application of the MK4501 is as a rate buffer, sourcing and
absorbing data at different rates, (e.g., interfacing fast
processors and slow peripherals).

Louis Ohland wrote:
> A dual-port FIFO memory with unlimited expansion capability
>
> Published in: Electronics and Power ( Volume: 31, Issue: 11.12,
> November-December 1985)
>
> Louis Ohland wrote:
>> Ooohh..
>>
>> Louis Ohland wrote:
>>> Sounds Image Adapter/A like. "high-speed video interface"
>>>
>>> Louis Ohland wrote:
>>>> 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

http://www.bitsavers.org/components/thomson/_dataBooks/1987_Thomson_Memory_Data_Book.pdf

pages 70-83

Louis Ohland wrote:
> The main application of the MK4501 is as a rate buffer, sourcing and
> absorbing data at different rates, (e.g., interfacing fast
> processors and slow peripherals).
>
> Louis Ohland wrote:
>> A dual-port FIFO memory with unlimited expansion capability
>>
>> Published in: Electronics and Power ( Volume: 31, Issue: 11.12,
>> November-December 1985)
>>
>> Louis Ohland wrote:
>>> Ooohh..
>>>
>>> Louis Ohland wrote:
>>>> Sounds Image Adapter/A like. "high-speed video interface"
>>>>
>>>> Louis Ohland wrote:
>>>>> 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