Very interesting about the dump, is that if you can read the chip and dump like the ASCII contents or are you talking about taking pictures of the chip die? On Sat, Jun 26, 2021 at 1:11 PM Gerrit Heitsch <gerrit_at_laosinh.s.bawue.de> wrote: > On 6/26/21 8:27 PM, Mike Naberezny wrote: > > On 6/21/21 10:58 PM, Gerrit Heitsch wrote: > >> If it's in fact a 6500/1 then the firmware should be dumpable using > >> the same method as was used for the Amiga keyboard controller and the > >> 1520 plotter. > > > > It worked. It is now confirmed that the "VIC-42" is a MOS 6500/1. > > > > The dump can be downloaded from my page: > > http://mikenaberezny.com/hardware/c64-128/alphacom-vp42-printer/ > > > > I haven't done a complete disassembly of it, but I did check the dump by > > following the reset vector. It leads to 6502 code that starts by > > clearing decimal mode and setting the stack pointer, as one would expect. > > Lets see if this is really only 2 KB or if MOS also had a version with > more ROM. The code will tell. > > Gerrit > > >Received on 2021-06-26 22:00:21
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