sneakers@heimat.UUCP (Dan "Sneakers" Schein) (12/02/88)
In Message <85@sns.UUCP>, johndoe@sns.UUCP (Christian Motz) writes: >I recently upgraded from my good old Amy 2000 A to a B-Model. I still >have the Memory Expansion Board that was plugged into the Processor slot >of the 2000 A. Now here's the Question: is there any way to use the board >in the B-Model? It would be a shame to throw away 1 MByte of RAM, right? >Unfortunately playing around with the jumpers on the board ("COMMODORE >1986 A2000 1MB RAM EXP. ASSY NO. 380 745 REV.3") had (almost) no effect. >Most of the time the machine simply stays dead on startup; the "best" >result was that the Power-LED flashed. > Could someone tell me what the jumpers on that board mean and if there >is some simple hardware hack to get the board working in the 2000 B? I >would appreciate any help. > Chris. Since that board resides at $C00000 - it will not work in a B2000 because a B2000 already has 512K at that address. Moving those jumpers around will not solve the problem, they simply allow for 1meg or 512K on that board. As for what to do with the board, heres 2 ideas ;-) #1> Place a 86 pin card edge connector on the component side and use it as a memory expansion card on a 1000. I did this when I was at CBM and when I visited a few weeks back my old one was still im my old office working. #2> Place a buss connector (the type that receives 86 pins) on the solder side and use it in a SideCar for 1000 memory expansion. Ive also done this and it works. Im not sure what (if anything) happens when you switch a B2000 to 1meg of CHIP memory, but im sure some CBM type (GRR || Hazey) can tell you if $C00000 is in use at that point or not. -- Dan "Sneakers" Schein {pyramid|rutgers|uunet}!cbmvax!heimat!sneakers Sneakers Computing 2455 McKinley Ave. Of course heimat is an Amiga. West Lawn, PA 19609 Doesn't everyone run UUCP & UseNet on an Amiga? Call: BERKS AMIGA BBS - 60+ Megs - 24 Hrs - 3/12/2400 Baud - 215/678-7691