AddMem

[leofoe]

I have an A1000 with a trapdoor RAM-expansion and also a half meg extra RAM soldered on the existing chips. The latter is added with the AddMem program in the startup-sequence at location $80000-$FFFFF.
When I add an A590 HD with 2 meg of RAM, the system crashes when I use AddMem with the same memory location. So obviously, that's not right. The A1000's memory map:

$000000-$07FFFF Chip RAM
$080000-$1FFFFF Reserved
$200000-$9FFFFF Potential Fast-RAM
$A00000-$BEFFFF Reserved
$BFD000-$BFDF00 PIA B (even addresses)
$BFE001-$BFEF00 PIA C (odd addresses)
$C00000-$DFEFFF Reserved for expansion
$DFF000-$DFFFFF Custom chip registers
$E00000-$E7FFFF Reserved
$E80000-$EFFFFF Expansion ports
$F00000-$F7FFFF Reserved
$F80000-$FFFFFF System ROM

Can I use all RAM I have?

[leofoe]

Zac67 wrote:
I would've thought this is possible...
$80000 is just behind the 512 KB chip mem and the A590's RAM should start at $200000 - could you verify this?

How do I do that?

Doobrey wrote:
What Kickstart are you using?

Version 1.3

[leofoe]

ShowConfig doesn't work under WB1.3.
I'll try SysInfo later.
Thanks.

[leofoe]

Results of SysInfo:
2 MEG 200000 - 3FFFFF
1/2 MEG 0 - 7E7FF

When I add 1 MEG at location 400000 AddMem says it's e bad location and won't do it.
If I add 1 MEG at location 300000 it will do it. But that can't be correct, can it?

[leofoe]

Zac67 wrote:
The best way to find out fore sure would be to open up amy and look what cable connections were added inside. To eliminate ghosting you'd have to modify the hack anyway...

You mean this?