Oops, Model 90 with N should be at 10. Though 08 won't hurt.

Louis Ohland wrote:

You must tell us the error[s] of your ways, in order to be sanctified...

Really, you had a T2 IML system with an unknown BIOS level. At this
point, your SCSI controller is unknown. So if my SWAGs are wrong, say
lah vee...

SIMMply put, you wrote the T4 N complex CMOS values into the NVRAM, then dropped the T2 back in. Drain the CMOS, use the refdisk to reconfigure
in order to get the T2 running. Use J10 [?] to "force" the system to use
the refdisk.

Instead of describing the whole T2 and SCSI controller SCSI BIOS level
thing, we'll look at getting the "N" up to cruising speed [a worthy endeavor].

The N is FLASH based, so it should not have any issue with completing
IML. What version of SurePath does the N have?

If you have level 01, please save it! MAJ Tom hid the list of SurePath levels, we got 02, 03, 05, 08, 09, and 10 IIRC.

If your N is below 05, it won't work with the latest refdisk/diags, but
it WILL flash. I had an N at 03, flashed it to 05, no problem.

Further fun. I >assume< your T2 was downlevel and did not have the
enhanced BIOS. The SCSI HD was formatted with the downlevel complex
BIOS. Now you dropped in an N with the Enhanced complex BIOS and things
jist ain't raahht.

What you need to do for N-ification...

SCSI controller MUST have the 44/45 SCSI BIOS.

N MUST be SurePath 05 or better [or you need older refdisk/diags]

Once the N is 05 or better, we will kick the Model 90 in the head with
steel toe boots... by moving J10, we will force it to read the refdisk.
In case you are curious-blue, the override jumper function was patented
and it applies to all of the complexi...

https://www.ardent-tool.com/complex/T3.html#H097075

"The RETAIN tip says:
   The installation instructions for the 50 MHz processor board, FRU
P/N 92F0048, used in the 8590 and 8595 are incomplete.

Remove the existing complex, then move the override jumper, [8590 - J10,
8595 - J16], so that it connects the center pin and the pin on the
opposite end of the connector. Leave the jumper in this position. [It
does not matter if you change the complex before or after moving the
jumper].

Note: The system detects any change in the Override Jumper position from
the last power on, and if it detects a change, it FORCES it to read the
Ref Disk on the next boot -ONLY-. It is a one-shot wonder.

The system will detect this change and read the Initial Machine Load
(IML) image from the new reference diskette."

Reformat SCSI HD, install convenience partition, install O/S of choice.

Done.

Processor Complex Installation https://www.ardent-tool.com/complex/Install.html

Type 4 "N" Processor Complex
https://www.ardent-tool.com/complex/T4_N.html

SCSI Drives Over 1 GB
https://www.ardent-tool.com/IBM_SCSI/SCSI_over_1GB.html

IBM PS/2 System ROM Images - there are NO T4 flash images... https://www.ardent-tool.com/firmware/system.html

Thank Heavens for old mirrors, 'cuz the drunken Moravians have mucked
things up.

BIOS Releases
http://ohlandl.ipv7.net/complexes/Type4.html#BIOS

Complex BIOS Levels
http://ohlandl.ipv7.net/complexes/Type4.html#BIOS_levels

Ryan Alswede wrote:

Is there a BIOS update required.  Link?

Install

d a Type 4 DX2 66mhz complex in place of the Type 2 DX2 50 complex and
it did not like it at all.

ON a side note going back to the Type 2 complex the SCSI device
reports error and will not boot.

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