Yeah the problem we had with Magic Voice was it would take over the bus when the 6502 went for the reset vector at $FFFC and would take over the boot. The problem we had was we had to do some housekeeping to set up the MMU/VIC first but couldn't really stop the MV cart from jumping in. To get by it we inverted the reset line and made the Z80 wake up first and set up the MMU for C64 mode if it saw a C64 cart, and then start the 02. -----Original Message----- From: firstname.lastname@example.org [mailto:email@example.com] On Behalf Of Groepaz Sent: Tuesday, December 17, 2013 5:23 PM To: firstname.lastname@example.org Subject: Re: Ribbon Cable On Tuesday 17 December 2013, you wrote: > and that some carts > like the Magic Voice cart would drive the bus at unexpected times > including the high address lines (They would toggle /GAME and /EXROM > dynamically when the system had been designed for them to be solder > jumpers). Eventually I stopped trying to "improve" it and try to > learn to "live with" it. its a common trick used by a bunch of cartridges... for example to switch to ultimax mode depending on the address lines, so you can get memory at 8000 which can accept writes. magic voice is interesting though, as the software first probes the cartridge in the passthrough port, and then sets its own game/exrom lines accordingly ... would make an excellent cartridge dumping setup with a little bit of custom software :) -- http://www.hitmen-console.org http://magicdisk.untergrund.net http://www.pokefinder.org http://ftp.pokefinder.org Politicians are like diapers. They both need changing regularly and for the same reason. Message was sent through the cbm-hackers mailing list Message was sent through the cbm-hackers mailing listReceived on 2013-12-18 00:00:04
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