Hi Oscar, > > > In the gif file of the schematic A13 of the erom shows it should not be > > > connected! This is wrong! > > > A13 pin 26 of the 27c256 should be insterted into the eprom socket! > > > > Ops! You're right. I forgot to color the pin when documenting the kit. > > I'll fix this ASAP. > > > > > All is fine now!! > > Is 27C256 A13 pin directly connected to EPROM socket and Pin3 of 74LS139?
Yes. > And, is possible to bypass the BIOS upgradre with a jumper in VCC signal? Humm, if you�re thinking about only disabling the BIOS upgrade itself, the answer is yes. Even better, you could instead use a switch on the /CS signal from the EPROM soquet (pin-20). Anyway, IMHO there�s no advantage of doing this, because disabling the MSX-Audio BIOS make so much sense as disabling the MSX-Music BIOS on a FM-PAC cartridge: The BIOS does not interfere with anything, it just "sits" there, waiting for you to use it. Much better than the anoying Philips MusicBox Editor EPROM. But if you want some way to "disable the upgrade and get the Anoying Philips MusicBox back", then it�s not that simple. To run the MusicBox Editor after the BIOS upgrade, is easier just load it in RAM using ExecROM, LoadROM, etc. Regards, FRS _______________________________________________ MSX mailing list ([email protected]) Info page: http://lists.stack.nl/mailman/listinfo/msx
