FRS
Thanks for teh reply, no luck yet
Where did you connected the pin-15 of the 74LS139? It must me connected to the pin-20 of the eprom soquet on the MM.
Connected correctly
Please note that the pin-20 of both 27C256 and the SRAM must not be connected to this same pin, but to the pins 12 ans 11 of the 74LS139, respectively.
If i connect them 27256 to pin 12 and 61256 tp pin 11 then the sram is mapped to 0000., 2000 etc If I connect them 27256 to pin 11 and 61256 to pin 12 then the sram is on 1000, 3000 etc
Also check the A13 pin of your 27C257, as it may be connected to the wrong place.
A13 to 74LS193 pin 3
Maybe its short-circuited somewhere? Are the A12 and A13 lines short-circuited? Because they must not be.
Can't see any
On the msxaudio-BIOS.gif file, the only lines short-circuited are the "Y" like ones that have the same color. There are only two of them, labeled "/CS Soquete (pin-20)" and "IC3, pin-1".
Fine
Call Audio still does not work.
_______________________________________________ MSX mailing list (msx@stack.nl) Info page: http://lists.stack.nl/mailman/listinfo/msx
