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Kallikak

6502
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    http://school.anhb.uwa.edu.au/personalpages/kwessen/web/Collection.html

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    Sydney
  1. Only one battery is needed to start up a Mac II - but it has to be the right one. The CMOS battery is not important for startup.
  2. I love the 6502. Cleary it has limitations, but in many respects it is a magnificent chip. The Z80 is quite different, and also grand in its way. There are many things that are easier to do on one than the other, but given the choice I tend to go with the 6502. If only they'd put the extra 65C02 features in from the start... Ken
  3. The fuse is rated 1.6A/250V and has blown. There was no storm or other problem. The board is certainly charred - but only after I remove the dodgy components and clean it up will I be able to see the full extent of the damage. Ken
  4. OK - it's taken me until today to give this more attention. To keep things going I just swapped the Plus motherboard and back case with my 512Ke. Here are a couple of pics of the analog board. Clearly the damage is quite extensive. http://school.anhb.uwa.edu.au/personalpages/kwessen/Home/PlusAnalog1.jpg http://school.anhb.uwa.edu.au/personalpages/kwessen/Home/PlusAnalog2.jpg Ken
  5. Google for macsbug - there are several guides about. Or buy a second hand copy of Scott Knaster's Mac programming book - that's the best reference. Ken
  6. I just had a fairly catastrophic failure of my Mac Plus analog board. A few components are seriously charred, and though I haven't removed the board yet to check over thoroughly (it's too late at night to start doing this properly), I expect there will be too much damage for anything other than a replacement. A disturbing aspect is that this failure occurred while the machine was turned off... I had used it about an hour earlier, turned it off, but left it plugged in. Next thing I know is that the magic smoke has escaped from the Plus and filled up the living room. (My wife was not partic
  7. When writing mathematical software to run on a FPU-less machine, using fixed point rather than floating point for non-integer calculations usually results in significant speed improvement. This approach is well supported in SANE, but comes with some loss of precision. Ken
  8. The original poster did not indicate which high level language. For C and Pascal, the 6502 hardware stack limitation is an issue and limits recursion, but for Forth, say, there is no real problem since the data and return stacks are separate. (The same "trick" could be built into a 6502 C compiler of course.) On the other hand, maybe the original question implies a desire to program 6502 assembly on a mac? That's certainly possible as well - I think I'd use OrgASM (try searching for that! ) and MPW. Ken
  9. What will you do once you have everything?
  10. I just tried starting up my 128K Mac with an 800K 6.0.8 system disk - and I may as well have put in a slice of toast. It found absolutely nothing of interest - no Happy Mac, just eject and the flashing X. Ken
  11. Given that no Happy Mac appears in the absence of a System File, it must somehow be finding it or at least becoming aware of its presence. I'd suggest formatting an 800K disk, copying System 1 onto it (presumably only using the "first" 400K), and then seeing how far the boot up process gets. If at least the Happy Mac appears, I'd then delete the System File and ensure that it appears no longer. I always understood that where there was overlap, HFS control structures were expansions of MFS ones. If that is the case, it is not surprising that the 64K ROMs can make some sense of an 80
  12. It may have been possible once, but the current versions of Basilisk will not do the job. I'm quite surprised to hear 6.0.8 works on an LC II - it was never advertised as such. I put 6.0.8L on mine and never even thought of trying the normal version.
  13. That's certainly weird. A Performa 200 and a Classic II don't even have differing gestaltID's, so I don't know how the installer can tell the difference...
  14. Ah - I forgot the 150 was IDE as well. Also, keep in mind that not all PowerBooks support SCSI disk mode. Specifically, the 140 and 170 don't, and possibly some others.
  15. One big advantage of the 190 over any other 68K powerbook is it uses an IDE hard drive. 2.5" SCSI is getting quite hard to come by these days...
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