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Enhanced Cartridge Interface

A B C D E F H
o o o o o o o
o o o o o o o
1           7

Pin Name Description
A Res Reserved
B ~IRQ Interrupt request
C ~HALT Halt CPU
D A13 CPU Address bus line 13
E A14 CPU Address bus line 14
F A15 CPU Address bus line 15
H GND Ground
1 ~EXTSEL External Select
2 ~RST Reset output
3 ~D1XX Chip select at area $D1xx
4 ~MPD Math Pack (FP) disable
5 Audio input
6 ~REF Refresh cycle
7 +5V +5VDC

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