One fact overlooked when considering the plentiful RS/6000 configuration
choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
slots.

Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
and 4 slots?

Still no idea on the saving of RS/6000 POS values, maybe not in the ODM,
but NVRAM?

Christian, the lack of any changed values in the 4-4 POS registers was
galling, but perhaps the chosen values are stored in the NVRAM. This is
way out of my usual stomping grounds. Grasping at thin straws here...

Louis Ohland wrote:
> One fact overlooked when considering the plentiful RS/6000 configuration
> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
> slots.
>
> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
> and 4 slots?
>
> Still no idea on the saving of RS/6000 POS values, maybe not in the ODM,
> but NVRAM?

Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
> One fact overlooked when considering the plentiful RS/6000 configuration
> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
> slots.
>
> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
> and 4 slots?

RS/6000 systems *may* have many IOU (input/output) or XIO (extended input/output) modules with their own IOCC (I/O channel control unit), each controlling up to 8 Micro Channel slots.
See SA23-2647-00 POWERstation and POWERserver - Hardware Technical Information - General Architectures, section 1-8, Figure 3 "Fourth Processor Chip Set".
https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf

My guess is that each IOCC has its own NVRAM.

Chapter 2. System I/O Structure, page 105

Processing. Processing.

Christian Holzapfel wrote:
> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>> One fact overlooked when considering the plentiful RS/6000 configuration
>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>> slots.
>>
>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>> and 4 slots?
>
> RS/6000 systems *may* have many IOU (input/output) or XIO (extended input/output) modules with their own IOCC (I/O channel control unit), each controlling up to 8 Micro Channel slots.
> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical Information - General Architectures, section 1-8, Figure 3 "Fourth Processor Chip Set".
> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>
> My guess is that each IOCC has its own NVRAM.
>

IOCC = CACP ?

Christian Holzapfel wrote:
> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>> One fact overlooked when considering the plentiful RS/6000 configuration
>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>> slots.
>>
>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>> and 4 slots?
>
> RS/6000 systems *may* have many IOU (input/output) or XIO (extended input/output) modules with their own IOCC (I/O channel control unit), each controlling up to 8 Micro Channel slots.
> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical Information - General Architectures, section 1-8, Figure 3 "Fourth Processor Chip Set".
> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>
> My guess is that each IOCC has its own NVRAM.
>

Bus Time Out page 124

A number of conditions can result in a hung bus or in grossly extended
I/0 bus cycles. These errors can result in overrun conditions to other
devices on the I/O bus and are checked by the IOCC using a bus timeout
mechanism. Although the minimum architected bus timeout value is 7.8
microseconds, the IOCC does not attempt to check that finely and should
Implement a timeout that varies between 15 and 120 microseconds. See
"Implementation Details" on page 2-86.

Christian Holzapfel wrote:
> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>> One fact overlooked when considering the plentiful RS/6000 configuration
>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>> slots.
>>
>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>> and 4 slots?
>
> RS/6000 systems *may* have many IOU (input/output) or XIO (extended input/output) modules with their own IOCC (I/O channel control unit), each controlling up to 8 Micro Channel slots.
> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical Information - General Architectures, section 1-8, Figure 3 "Fourth Processor Chip Set".
> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>
> My guess is that each IOCC has its own NVRAM.
>

Special Facilities page 177
Figure 77 shows the register organization within the IOCC.

Christian Holzapfel wrote:
> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>> One fact overlooked when considering the plentiful RS/6000 configuration
>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>> slots.
>>
>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>> and 4 slots?
>
> RS/6000 systems *may* have many IOU (input/output) or XIO (extended input/output) modules with their own IOCC (I/O channel control unit), each controlling up to 8 Micro Channel slots.
> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical Information - General Architectures, section 1-8, Figure 3 "Fourth Processor Chip Set".
> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>
> My guess is that each IOCC has its own NVRAM.
>

Chapter 3. Vital Product Data page 199

I am konfuzed. VPD stores POS?

Louis Ohland wrote:
> IOCC = CACP ?
>
> Christian Holzapfel wrote:
>> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>>> One fact overlooked when considering the plentiful RS/6000 configuration
>>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>>> slots.
>>>
>>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>>> and 4 slots?
>>
>> RS/6000 systems *may* have many IOU (input/output) or XIO (extended
>> input/output) modules with their own IOCC (I/O channel control unit),
>> each controlling up to 8 Micro Channel slots.
>> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical
>> Information - General Architectures, section 1-8, Figure 3 "Fourth
>> Processor Chip Set".
>> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>>
>>
>> My guess is that each IOCC has its own NVRAM.
>>

• •co L = board ID (adapter board ID) page 203
The board ID field is supplied by software after reading the board ID
from POS 0 and POS 1 registers. (Programmable Option Select (POS),
replaces switches on feature boards. It is defined under •Micro Channel
Adapter Requirements• on page 3-16.) This descriptor only applies to
Micro Channel adapters. This descriptor is not present within the
machine-readable VPD field contained within an adapter or channel. It Is
added by software to the configuration and VPD file or the NVRAM area
for VPD.

Following the two bytes of the board ID Is a field generated and used by
software, which contains mask bytes and POS data used to initialize the
adapter. It also contains a flag byte to Indicate whether this adapter
was successfully configured. The detailed specification of this field Is
defined by the software operating system.

Christian Holzapfel wrote:
> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>> One fact overlooked when considering the plentiful RS/6000 configuration
>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>> slots.
>>
>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>> and 4 slots?
>
> RS/6000 systems *may* have many IOU (input/output) or XIO (extended input/output) modules with their own IOCC (I/O channel control unit), each controlling up to 8 Micro Channel slots.
> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical Information - General Architectures, section 1-8, Figure 3 "Fourth Processor Chip Set".
> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>
> My guess is that each IOCC has its own NVRAM.
>

Micro Channel Adapter Requirements page 214

Christian Holzapfel wrote:
> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>> One fact overlooked when considering the plentiful RS/6000 configuration
>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>> slots.
>>
>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>> and 4 slots?
>
> RS/6000 systems *may* have many IOU (input/output) or XIO (extended input/output) modules with their own IOCC (I/O channel control unit), each controlling up to 8 Micro Channel slots.
> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical Information - General Architectures, section 1-8, Figure 3 "Fourth Processor Chip Set".
> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>
> My guess is that each IOCC has its own NVRAM.
>

R/W Port for Ext Config Data (VPD) page 215

POS[3]

Louis Ohland wrote:
> Micro Channel Adapter Requirements page 214
>
> Christian Holzapfel wrote:
>> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
>>> One fact overlooked when considering the plentiful RS/6000 configuration
>>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
>>> slots.
>>>
>>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
>>> and 4 slots?
>>
>> RS/6000 systems *may* have many IOU (input/output) or XIO (extended
>> input/output) modules with their own IOCC (I/O channel control unit),
>> each controlling up to 8 Micro Channel slots.
>> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical
>> Information - General Architectures, section 1-8, Figure 3 "Fourth
>> Processor Chip Set".
>> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
>>
>>
>> My guess is that each IOCC has its own NVRAM.
>>

On Friday, January 13, 2023 at 6:59:31 AM UTC-8, Louis Ohland wrote:
> R/W Port for Ext Config Data (VPD) page 215
>
> POS[3]
> Louis Ohland wrote:
> > Micro Channel Adapter Requirements page 214
> >
> > Christian Holzapfel wrote:
> >> Louis Ohland schrieb am Freitag, 13. Januar 2023 um 02:28:36 UTC+1:
> >>> One fact overlooked when considering the plentiful RS/6000 configuration
> >>> choices is that while PS/2 systems have 8 slots, RS/6000 may have over 8
> >>> slots.
> >>>
> >>> Ever consider why the Server 195 / 295 has two sets of slots, 8 slots
> >>> and 4 slots?
> >>
> >> RS/6000 systems *may* have many IOU (input/output) or XIO (extended
> >> input/output) modules with their own IOCC (I/O channel control unit),
> >> each controlling up to 8 Micro Channel slots.
> >> See SA23-2647-00 POWERstation and POWERserver - Hardware Technical
> >> Information - General Architectures, section 1-8, Figure 3 "Fourth
> >> Processor Chip Set".
> >> https://ardent-tool.com/RS6000/docs/pdf/SA23-2643-03_RS6000_Hardware_Technical_Information_General_Architectures_1993.pdf
> >>
> >>
> >> My guess is that each IOCC has its own NVRAM.
> >>
Chet Heath

Blessed be his name!

Other than praising the creator [VGER ?] what's up with Chet Heath?

KP2 KP2 wrote:
> Chet Heath