https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS188-024/index.html

The Personal System/2 Multi-Protocol Adapter/A provides a
full-duplex or half-duplex multi-protocol serial data transmission
channel. It supports asynchronous, bisynchronous, HDLC, or SDLC
protocols. It will support modems or direct attachment. The option
is programmable at speeds of up to 19,200 bps and supports automatic
protocol switching via software at setup.

--- SoupGate-Win32 v1.05
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On Tuesday, November 9, 2021 at 8:57:51 AM UTC-7, Louis Ohland wrote:

https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS188-024/index.html

The Personal System/2 Multi-Protocol Adapter/A provides a
full-duplex or half-duplex multi-protocol serial data transmission
channel. It supports asynchronous, bisynchronous, HDLC, or SDLC
protocols. It will support modems or direct attachment. The option
is programmable at speeds of up to 19,200 bps and supports automatic
protocol switching via software at setup.

https://www.ebay.com/itm/142188857700

He has a single, NIB adapter, marked as "without ZM1" - I thought there was a listing for multiple boards without 'ZM1' as well.

--- SoupGate-Win32 v1.05
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Huh, not coming up with MPCA with ZM1, but I'll look.

On 11/9/2021 10:36, IBMMuseum wrote:

On Tuesday, November 9, 2021 at 8:57:51 AM UTC-7, Louis Ohland wrote:

https://www.ibm.com/common/ssi/ShowDoc.wss?docURL=/common/ssi/rep_ca/4/897/ENUS188-024/index.html

The Personal System/2 Multi-Protocol Adapter/A provides a
full-duplex or half-duplex multi-protocol serial data transmission
channel. It supports asynchronous, bisynchronous, HDLC, or SDLC
protocols. It will support modems or direct attachment. The option
is programmable at speeds of up to 19,200 bps and supports automatic
protocol switching via software at setup.

https://www.ebay.com/itm/142188857700

He has a single, NIB adapter, marked as "without ZM1" - I thought there was a listing for multiple boards without 'ZM1' as well.

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

Well, turbo-spankulate me...

SYMPTOM:
01291300 errors and OS/2 Trap 0002 errors while running
applications which use the MPCA (Multiprotocol Adapter/A).

PROBLEM ISOLATION AIDS:
1. The system unit has a 66Mhz or faster processor.
2. A Multiprotocol Adapter/A is installed.
3. No diagnostics fail.

FIX:
On higher speed PS/2 systems (66MHZ and greater), a DMA timeout
error may occur due to timing factors associated with speed of
the system processor.

The fix for this problem is to replace the MPCA Adapter/A with
FRU P/N96F9156 which corrects the problem.
If the MPCA adapter currently installed is FRU P/N96F9156, this
tip does not apply and routine problem determination should
continue. Refer to RETAIN record # H017325 for additional
information and guidance.

When current inventories of FRU P/N85F0004 are exhausted, all
All orders for it will be automatically substituted to the new
FRU, P/N 96F9156.

Non Pentium processor Systems running at speeds at, or below,
33mhz have no operational problems with FRU P/N85F0004 and this
adapter should not be swapped to the new FRU part number unless:
1. The MPCA adapter installed is failing -and-
2. Current inventories of 85F0004 are exhausted.

For information on having FRU P/N85F0004 reworked to the current
level (FRU P/N96F9156) contact Charlie Hoffecker at T/L 795-4517
or (407) 595 - 4517.

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

On Tuesday, November 9, 2021 at 10:33:46 AM UTC-7, Louis Ohland wrote:

Well, turbo-spankulate me...

SYMPTOM:
01291300 errors and OS/2 Trap 0002 errors while running
applications which use the MPCA (Multiprotocol Adapter/A).

PROBLEM ISOLATION AIDS:
1. The system unit has a 66Mhz or faster processor.
2. A Multiprotocol Adapter/A is installed.
3. No diagnostics fail.

FIX:
On higher speed PS/2 systems (66MHZ and greater), a DMA timeout
error may occur due to timing factors associated with speed of
the system processor.

The fix for this problem is to replace the MPCA Adapter/A with
FRU P/N96F9156 which corrects the problem.
If the MPCA adapter currently installed is FRU P/N96F9156, this
tip does not apply and routine problem determination should
continue. Refer to RETAIN record # H017325 for additional
information and guidance.

When current inventories of FRU P/N85F0004 are exhausted, all
All orders for it will be automatically substituted to the new
FRU, P/N 96F9156.

Non Pentium processor Systems running at speeds at, or below,
33mhz have no operational problems with FRU P/N85F0004 and this
adapter should not be swapped to the new FRU part number unless:
1. The MPCA adapter installed is failing -and-
2. Current inventories of 85F0004 are exhausted.

For information on having FRU P/N85F0004 reworked to the current
level (FRU P/N96F9156) contact Charlie Hoffecker at T/L 795-4517
or (407) 595 - 4517.

Great data! - There was other information it was linked to the PS/2 model. Why does this material seem so familiar? I am remembering something like this being up in the past.

--- SoupGate-Win32 v1.05
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For information on having FRU P/N85F0004 reworked to the
current level (FRU P/N96F9156) contact Charlie Hoffecker...

BTW, he has a profile on LinkedIn too...

--- SoupGate-Win32 v1.05
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