A2000 Supra ram card question

[shaf]

I might ber wrong but try this:

Jumper the Supra Ram card to 4 MB and run the RAM test again.

Depending on the Version of the A2000 Motherboard and ROMs on the A2630 only 8 MB or Total RAM is supported.
The A2630 2 MB of Ram is actually configured as $ MB or RAm only leaving space to autoconfig another 4 MB or RAM.

I'd have to check the Memory Map from the Tech. Refrence manual to be sure.

Cheers

Shaf

[shaf]

Hello ,

If the Machine Doesn't boot from Hard Drive it might be because of thr A2000 Motherboard Revision.

CBM Service Bullitin # C3-1.14 (May 20,1989)

A Problemn has been found with the A2620 Accelerator and A2090 Hard Disk Controller with A2000 Motherboard revisions 4.1, 4.2, 4.3 or 4.4.
   This is seen as read/write disk errors or memory failures with this configuration of hardware.

The problem may be solved by adding a pull-up resistor on the _BAS signal.

The rework is to add a 3.3K ohm resistor between pin 20 and pin 11 on U605 (74LS245). This chip is located near connectors CN 600 (86 Pin expansion slot).

Cheers

Shaf

[shaf]

Hello ,

If the Machine Doesn't boot from Hard Drive it might be because of thr A2000 Motherboard Revision.

CBM Service Bullitin # C3-1.14 (May 20,1989)

A Problemn has been found with the A2620 Accelerator and A2090 Hard Disk Controller with A2000 Motherboard revisions 4.1, 4.2, 4.3 or 4.4.
   This is seen as read/write disk errors or memory failures with this configuration of hardware.

The problem may be solved by adding a pull-up resistor on the _BAS signal.

The rework is to add a 3.3K ohm resistor between pin 20 and pin 11 on U605 (74LS245). This chip is located near connectors CN 600 (86 Pin expansion slot).

Cheers

Shaf