mwandel@tiger.waterloo.edu (Markus Wandel) (04/09/90)
I need to find the circuit which can be used with the Amazing Computing piggyback memory hack to map the extra memory at $C00000. The reason for this is weird. The piggyback memory is in my machine, as is the address decoding hack, but I didn't put it there. I paid someone the cost of the chips plus a bit extra to put it in for me. This guy (hi Mark!) had done it so many times, he could have done it blindfolded, and he did a perfect job, but I never got a schematic for the extra address decoding. He didn't have it. He had lost it long ago and was just copying the daughterboard modifications from his own machine. The memory has worked without a hint of trouble for two years, but just in case I need them, I think complete schematics might be a good thing to have. I have the Amazing Computing article, I just need the documentation for the address decoding. I'm sure it's floating around somewhere as an ASCII file, could someone mail it to me? I'd much appreciate it. Markus Wandel mwandel@tiger.waterloo.edu (519) 884-9547
bscott@pikes.Colorado.EDU (Ben Scott) (04/10/90)
In article <23027@watdragon.waterloo.edu> mwandel@tiger.waterloo.edu (Markus Wandel) writes: >I need to find the circuit which can be used with the Amazing Computing >piggyback memory hack to map the extra memory at $C00000. The reason for >this is weird. The piggyback memory is in my machine, as is the address >decoding hack, but I didn't put it there. I paid someone the cost of the >chips plus a bit extra to put it in for me. This guy (hi Mark!) had done >it so many times, he could have done it blindfolded, and he did a perfect job, >but I never got a schematic for the extra address decoding. He didn't have it. I bought a used, keyboardless Amiga 1000 for $100 (and later got a keyboard for $25, suprisingly enough) and was informed it had the piggyback hack inside it. Since it seemed to autoconfig anyway, I accepted this and have a 512K machine which seems normal. However, recently I've been trying to find a 256K expander to put in since 768K would be nice... anyway, all the ones I've tried in the little slot have not worked. Is this just a huge coincidence or is there something about the hack that causes the 256K expander to fail? I know nothing about the hack itself, never heard of it before I got the 1000, don't know any specifics like whether it has the address decoder (whatever that is). This does belong in c.s.a.hardware and I've directed followups there (I hope). If anyone can tell me more about how I can add memory cheaply (people seem to be selling these 256K boxes rather cheaply these days...) I'd appreciate it. . <<<<Infinite K>>>> Well, not quite... -- _______________________________________________________________________________ | | | Someday, I'm going to make up a clever .sig file like everyone else has... | |_____________________________________________________________________________|