TECHNICAL INFORMATION
__________________________________
Channel 2
Tone Generation of
Speaker
Gate 2
Controlled by bit 0 of
port hex 61 PPI bit
Clk in 2
1.190 Mhz OSC
Clk out 2
Used to drive the
speaker
Note :
Channel 1 is programmed to generate a 15-micro-second
period signal.
The 8254 Timer/Counters are treated by system
programs as an arrangement of four programmable
external I/O ports. Three are treated as counters and the
fourth is a control register for mode programming.
Содержание HIPPO II 486
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Страница 106: ...Appendix D System Board Layout _______________________________...
Страница 107: ...Appendix E Memory Expansion Card Layout _______________________________...