Specifications

EPC-8 Hardware Reference
A A
A-4
Miscellaneous
I/O Addr Functional group Usage
0EE Fast A20 Dummy read enables Fast A20,
dummy write disables Fash A20
0EF Fast CPU reset Dummy read resets the CPU
0F4 Slow CPU reset Dummy write enables slow clock
and non-turbo mode
0F5 Fast CPU register Dummy write enables Fast clock
and turbo mode
0F9 Configuration disable Dummy write disables access to
configuration registers
0FB Configuration enable Dummy write enables access to
configuration registers
EXM Configuration
I/O Addr Functional group Usage
100 EXM Configuration EXM IDs (on each EXM module)
102 EXM option byte 1
103 EXM option byte 2
Ethernet
I/O Addr Functional group Usage
240-25F Default Ethernet
registers
(programmable)
Serial I/O (Com2) Port:
VLSI 37C651/6531 emulates 8251 of PC/AT
I/O Addr Functional group Usage
2F8 COM2 serial port Receiver/transmitter buffer
Baud rate divisor latch (LSB)
2F9 Interrupt enable register
Baud rate divisor latch (MSB)
2FA Interrupt ID register
2FB Line control register
2FC Modem control register
2FD Line status register
2FE Modem status register
Parallel I/O (LPT1) Port:
VLSI 37C651/653 emulates 8255 of PC/AT
I/O Addr Functional group Usage
378 LPT1 parallel port Printer data register
379 Printer status register
37A Printer control register
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