kpuchatek wrote:
Now adding two SAAs should not be difficult based on reversed PAL.
Not even the PAL information is required. The CT1320 CMS part is done with standard glue logic chips to lengthen ISA bus cycles according to CMS chip DTACK signal.
So CMS glue logic can be made similar to CT1320 and then all it needs is additional glue logic for GameBlaster detection. And better audio circuits, the analog power supplies are made with zener diodes and it is quite noisy.
(BTW, I recall reading that when you use CMS IO ports on a CT1320 but without the SAA1099 chips installed, it could hang the system, as the glue logic tries to lengthen ISA bus cycle indefinitely as there is no DTACK from the CMS chip. I cannot verify this as my CT1320 has the CMS chips soldered instead of sockected.)
kpuchatek wrote:
Sergey sais his card is Adlib compatible, so I think OPL2 is properly detected.
Currently DSP part of SB is not important to me.
Ah you mean a combined Adlib/CMS card? Interesting. I only thought about separate CMS card. Combined Adlib/CMS card will just be more complex to design.
But yes Sergey's card does nothing special, so as long as the OPL2 chip is at the right address it looks like standard Adlib.