A2620 ('020) + GVP HC+8 RAM issue

[blakespot]

I've had a 3.1 ROM ECS A2000 for a good while now. It has a GVP Impact HC+8 card controlling my SCSI drive and with 8MB onboard. I just added an A2620 68020 accel with 2MB 32-bit RAM.

HD was not seen at boot.
 
Finding a similar case via Google, I dropped the GVP card's RAM to 4MB and indeed it boots up under 68020.

But only the 2MB on the A2620 (FAST RAM) are seen. No FAST RAM from the GVP card is seen. (When I boot under 68000 I get 4MB total, all on the GVP, as far as FAST RAM.)

Can I not see RAM in the Zorro slots when under 68020 control on this accelerator?

Thanks.






bp

[blakespot]

The A2620 has the latest ROMs, BTW.



bp

[blakespot]

Does the GVP card need to be jumpered to 4MB?

Indeed, and it has been.




bp

[blakespot]

So will the GVP Impat HC+8 - even with 4MB RAM only - not work with the A2620 (68020 card), as far as making its RAM available?

It appears not to be working.

Is there a cheap Zorro II RAM card I can grab to replace it (but keeping it for SCSI usage)?

Thanks.  :-(




blakespot

[blakespot]

I did change the jumper settings on the HC+8 to reflect the proper amount of RAM.  I found that not at 8MB or 6MB would the HC+8's SCSI drive appear, under A2620 control, but under 4MB.  I had seen another user report this in searching on the issue.

Is there anywhere I can find another 2MB of 32-bit ZIP memory that I can solder to my A2620?

Thanks.



blakespot