IO map

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M100/T102/T200 IO Map

IOM100T200
80h-8Fh Device-select signal for optional IO controller unit
90h-9Fh Device-select signal for optional answering telephone unit 90h - Ram address (4-bit)

91h - Ram data (4-bit)
9Dh - Timer control(4-bit)

A0h-AFh Bit 0 - ON/OFF of relay for signal selection of telephone unit
Bit 1 - Generates ENABLE signal of LSI for MODEM
B0h-BFh PIO 81c55 PIO 81c55
C0h-CFh DATA input/output of UART UART 8251
D0h-DFh UART settings Banks Selection
E0h-EFh Keyboard return Keyboard return
F0h-FDh LCD
FEh LCD LCD Command/status
FFh LCD LCD Data