By the way... I think I know why this didn't turn up when I tested the memory sticks individually. I guess the first one I tested and left running was the bad one, then the others I didn't test for long enough to notice the display going into standby,
because they all start out the same. Oy...
I will say, I would have expected memory error codes for bad or incompatible memory. I read through the step by step diagnostic charts before posting here and everything pointed to a processor board or cache issue. Nothing mentioned RAM problems unless
there was a memory error code or beeping involved. I guess at the time it may not have been common for incorrect (but fitting) PC memory to have been installed in these systems.
On Monday, March 27, 2023 at 1:31:47 PM UTC-4, Ozzuneoj wrote:
Thank you for the suggestions. I just tried this just to be sure, and to my surprise something did change! One of the memory sticks (a simply 8 chip one labeled as 4MB... looks like one out of a normal PC) seems to hang the system forever at the
blinking cursor. With any combination of the other three however, the monitor will actually go into standby after about 6 seconds, stay in standby for several seconds, and then I actually start to get some error codes on the screen! They are 00060100 and
later 19990022... haven't looked them up yet, but they are probably related to all of the things I removed. I will try reconnecting everything and just using these SIMMs. They are, to me, a bit odd looking with 12 chips and slightly taller PCBs compared
to the SIMMs found in other PCs. Thank you again! I will report back here with my findings.
On Monday, March 27, 2023 at 1:12:29 PM UTC-4, Louis Ohland wrote:
Remove all MCA adapters. We are troubleshooting.
https://www.ardent-tool.com/complex/T2.html#L_486DX2-50
"L" complex, 486DX2-50, should work.
Try placing a pair of 4MB SIMMs on J11, the riser closest to the
complex. Use J1 and J3.
https://www.ardent-tool.com/90/Planar.html#Memory_Riser
The H and L can use single, paired, or mismatched SIMMs. But you are troubleshooting. Use a universally supported configuration. Can't hurt.
Re-seat the complex. https://www.ardent-tool.com/complex/Install.html
Re-seat SIMMs into J11 riser, using J1 (A1) and J3 (B1). Make sure the SIMMs are correctly oriented.
https://www.ardent-tool.com/complex/T3.html#H097075
https://www.ardent-tool.com/complex/Install.html
Power up. Report.
Ozzuneoj wrote:
92F0161 Processor Card with DX2 50Mhz and 41G96361 ROM
20MB (8+4+4+4) RAM on one memory card
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