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Amiga computer related discussion => Amiga Hardware Issues and discussion => Topic started by: jcrubin on April 01, 2018, 04:34:16 PM

Title: Baseboard and extra 512k chipram Fat agnus issues
Post by: jcrubin on April 01, 2018, 04:34:16 PM

Hello all,

Ive been working with my amiga in a stock hardware mode so that there are no external issues here.  No ACA500+ or anything like that.   Just a 68000.


Installed is a Baseboard expansion BB504A rev 1.2 with Floppy boot and install software version 1.7

Motheeboard rev is 6A

Agnus chip is 8372A 318069-02   [ECS?]   FAT AGNUS? or FATTER?


ROM jumper on baseboard is set for 1.3
JP2 on the motherboard is set to 2-3 [the center to forward connected]
Jumper on Baseboard is set to FAT
both Jumpers on sidecar board set to FAT

Sidecar board is 885048 rev 1.1
Fully populated with  HY534256S-80    9142A in every ram socket

memcheck ran on this configuration shows no errors, just FYI


Now..... If I run the Cram program either in boot or stand alone from the cli.  It says something like " 524280 added to chipram" and crashes, if I set the boot program to fat instead of fatter it loads fine but doesnt add the extra 512

is the motherboard jumper wrong for this agnus???

Title: Re: Baseboard and extra 512k chipram Fat agnus issues
Post by: jcrubin on April 01, 2018, 05:16:49 PM

Looks like it was JP2 after all.   I have changed it and now have 1 meg of chip ram

Title: Re: Baseboard and extra 512k chipram Fat agnus issues
Post by: number6 on April 01, 2018, 05:34:55 PM

Quote from: jcrubin;838134

Looks like it was JP2 after all.   I have changed it and now have 1 meg of chip ram

And how much fast ram is showing?

#6