A2000 Supra ram card question

[melott]

I got a Supra ram card for my A2000.
I have a problem.... the card has a test mode
and a ram? mode. (the jumper is T for test or R for Ram).
The card has 6 megs installed, there is 2 megs installed
on the 2630 accellerator, for a total of 8 megs.
The card tests OK in test mode but with the jumper set
for Ram mode the machine boots up them the power light
starts blinking and Guru. I don't think its the power
supply as it runs in test mode fine.
Is there a jumper on the MoBo that I'm unaware of or
anything like that??
I D/L'ed the docs and install disk from Amiga Hardware Data
but there really isn't any install prg.
Is there a lib I need to copy over or what??
I have 3.1 roms in the machine.
Also how do I make the DKB MultiStart rom switcher work ??
I had one in my A1000 several years ago, but I've forgotten
how to make it work (this A2000 has a switcher in it).

 

[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

[melott]

I'll try that..........

The machine does boot and run from floppy
but not from the harddrive.

[Will-i-am]

I have a Supra ram card on my vanilla A2000 w/ os1.3 and it was pretty much plug-n-play in that configuration. Never had any problems with it. I installed from the original disk.

[JimS]

On the DKB board... one of the ROMS is the default ROM. to switch to the other, hold down the ctl-A-A keys for about 5 seconds when booting. It should switch to the other ROM.

[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

[melott]

This machine has a 2091 HardCard and a 2630 accellerator.
The accellerator is an 030 @ 25mhz. I have to do somemore
checking but I think the problem is with the roms on the
accellerator. I have an older version of the roms and I'm
sure I read that they had a problem.
The machine boots from Harddrive and reconizes the ram if
I pull the accellerator. I think I'm going to have to find
the newer roms IF they are available.

[JimS]

Is there any RAM on the 2091?

[melott]

>Is there any RAM on the 2091?

No, there's no ram on the 2091 SCSI card but
there is 2 megs on the 2630 accellerator.