thanks André, really interesting.... On 01/11/2016 15:45, André Fachat wrote: > You may want to have a look at > http://www.6502.org/users/andre/petindex/superpet.html > > Regards, > André > > > Am 1. November 2016 14:26:08 schrieb Rhialto <rhialto@falu.nl>: > >> On Tue 01 Nov 2016 at 13:53:03 +0100, didier derny wrote: >>> if I saw this machine in 1981, I never really had the opportunity to >>> play with it >>> Initially I thought the 6809 was running on it's ram and communicating >>> with the 6502... >>> (a bit like the madison zram with it's z80) >>> >>> recently I found the schematics of the superpet board (combined one) >>> Finally (apparently according what I saw) >>> 1/ either the 6809 or the 6502 is running ? >> >> Yes, only one at a time. >> >>> 6809 stopped by the dma ? >> >> There is a hardware switch which usually controls which cpu runs. The >> changeover actually happens during RESET, if I remember well. Although >> there is also a setting on the switch to control it by software. >> However that isn't implemented in VICE I think. I haven't seen any >> software which uses it, so there is no info coming from that direction. >> >>> 6502 stopped by shutting down the power ? >>> 2/ the extra memory is only accessed as 16 page s of 4k in 9000 ? >> >> Yes. >> >>> 3/ it add a serial port >>> >>> 4/ a protection dongle >> >> The 6702, which was reverse engineered by this mailinglist and me. >> >>> Initially I thought the 6809 was running on it's ram and communicating >>> with the 6502... >>> >>> how are the rom decoded ? I dont really understand... >>> the standard rom are only 'seen' by the 6502 ? >>> the extra rom only 'seen' by the 6809 ? and mapped at the same place ? >> >> Yes, each CPU sees only its own ROMs even though they are mapped to the >> same address range. >> >> You can play with it in VICE, select the SuperPET model, and find the >> Waterloo software disk images. The 6809 is not emulated cycle-exact, but >> it is fairly close and apparently good enough for the normal SuperPET >> software. >> >>> didier >> -Olaf. >> -- >> ___ Olaf 'Rhialto' Seibert -- Wayland: Those who don't understand X >> \X/ rhialto/at/xs4all.nl -- are condemned to reinvent it. Poorly. > > > > Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2016-11-01 21:00:02
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