Richard Atkinson wrote: > > I personnaly prefer the plastic type because the other one has some > > incompatabilities and is less easier to repair. > > Are these incompatibilities the same as the C64 / C64C ones? Both later > machines use 9V HMOS chips, but I've not seen the same level of cost > reduction in the C128DCR as compared with the C64C. All Commodore seem to The only obvious component changes in the C128 part of the 128DCR are the 8580 SID instead of the 6581 one and the 8568 VDC instead of the 8563 one. I never heard that one of these ever caused any compatibility troubles. But there are other, less obvious differences. E.g. CBM changed something about the CIA timers from 1987 on, so 1987 and later 6526 chips behave a little bit differently than older models. The newer models seem to assert the IRQ line on a timer underrun one cycle earlier for some reason, this causes the trace mode of SMON to fail, for example. Naturally all machines manufactured after 1987 (C64C, C128DCR) and all machines that have been repaired with new chips suffer from this problem. But actually there's only one other program I know of that had problems with this behaviour, it's the 15 seconds parallel copier. Funet has a fixed version. Maybe the biggest problem are the new ROMs of the 128DCR, both the C128 ROMs and the 1571 drive ROMs are new revisions. Since the 128DCR was the first 128 I had, I don't know if any of the programs that failed on this machine wouldn't have failed on an original 128D, and I'm not gonna try that now ;-) Nicolas - This message was sent through the cbm-hackers mailing list. To unsubscribe: echo unsubscribe | mail firstname.lastname@example.org.
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