hedley@cbmvax.UUCP (Hedley Davis) (12/09/87)
I received an interesting phone call from a software vendor who was attempting to help an individual over the phone. Apparently his software was running extremely unreliably. After a certain amount of discussion, it came out that the user had a B2000 with 1 MEG of chip memory. Wow. It seems that the dealer who sold the unit found that he could upgrade his B2000's to 1 meg of chip memory simply by changing a couple of jumpers on the PCB. He then sold this unit to the buyer as having 1 meg of chip memory, and lo and behold, AVAIL indicates that there is indeed 1 meg. Unfortunately, AGNUS cannot properly address all of this memory, and even though the 68000 ( and therefore the memory manager type software ) can access it properly, alot of software will break as soon as the blitter ( for example ) is directed to act on this memory. The insidious thing is that the system will function ok for a while because the first memeory allocated out of chip memory will be the lower 512K which works just fine. Only when things get rolling will the system fail. Beware this 'enhancement'. Hedley