Changes

PlayCity

585 bytes added, 13:58, 9 July 2014
Don't forget to use RETN for NMI handlers as well as RETI for normal interrupt handlers. In other case, the Z80 CPU will not
aknowledge the next interrupt properly.
==Audio Channels==
===Informations===
The CTC-AY board is populated with two AY compatible soundchips, adding 6 stereo channels. The YMZ294 eliminate the I/O port
and improve the CPU interface through /CS, /WR control signals and a 8-bit data bus. Each sound chip can be directly
programmed using two dedicated I/O ports for registers and data. No initialization code is required.
 
By default, the YMZs are clocked at 4 MHz but run internaly at 2 MHz. So, they will sound like an Atari ST, while you don't change
the frequency by reprograming the CTC Channel 0.
===YMZ294 Registers===
123
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