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32KB cartridge images - format? #48
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BGPierce commented on Sep 14, 2016 |
msmcdoug commented on Sep 15, 2016 I'm talking about cartridge ROMs, not ECB/DECB internal ROMs! |
Luis46coco commented on Apr 14, 2017 |
BGPierce commented on Dec 11, 2019 My question would be, in what format is a "real" coco cart stored? VCC style or mame style? |
(from the old issues page)
msmcdoug commented on Sep 14, 2016
Seems there is an incompatibility between Vcc and MAME/MESS for 32KB ROM images.
MAME/MESS want a naturally-ordered ($8000-$FFFF) 32KB block whereas Vcc requires that the top and bottom 16KB blocks are switched ($C000-$FFFF,$8000-$BFFF).
Whilst archives on the net tend to be in the swapped format (Vcc) and therefore incompatible with MAME/MESS, it's worth noting that this swapped format is also unsuitable for burning to FLASH/EPROM.
I would argue that the naturally-ordered format is easier to produce for developers, compatible with MAME/MESS and FLASH/EPROM burners. Should we also change Vcc to use this format?
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