On Wed, Jun 11, 2014 at 05:29:35PM +0200, Rainer Buchty wrote: > On Wed, 11 Jun 2014, Gerrit Heitsch wrote: > >External test equipment can use this feature to test internal CPU > >logic and I/O. A program can be loaded into RAM allowing the contents > >of the instruction ROM to be dumped to any port for external > >verification. > > To me that -- optimistically -- confirms the "ROM-only" theory, although > admittedly the wording is very vague. But then you cannot dump the ROM that way. Many micros with a similar "load the program over a port" mode disable that mode as soon as some jump instruction is executed (those do not make sense when blasting in the insns anyway); maybe the 6500/1 does something similar? It shouldn't be very hard to try out all ops, see which ones stop port fetch. Segher Message was sent through the cbm-hackers mailing listReceived on 2014-06-11 16:01:05
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