First post, by Tronix
Recently, I made an expansion card based on CPLD Altera epm3256. The main purpose of this card is the logical analyzer of the ISA bus signals. In addition, the card has an SD and minijack 3.5 connector.
I did implement ports 0x378 and 0x278 for the emulation of two Covox's at LPT1 and LPT2. So, minijack left channel - covox at LPT1 and right channel - covox at LPT2. This is a stereo using two covox's.
I'm trying to use FastTracker II for playing modules. Separatly, there are no problems. I can easily switch from LPT1 to LPT2 and I hear music in the right (when i chose LPT1) or left (when i chose LPT2) channels. Worked wery well. Real record from LPT1 in mono mode here: https://clyp.it/fjeyp5kr
BUT when i chose LPT1+LPT2 and check checkbox "Stereo" - FastTracker halted. Sometimes, unexpected exit to DOS with debug information about registers and stack.
What am I doing wrong?