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Epson Research and Development
Vancouver Design Center
S1D13503
Hardware Functional Specification
X18A-A-001-08
Issue Date: 01/01/29
3.3 ISA Bus
Figure 4: 8-Bit Mode (ISA)
(example implementation only - actual may vary)
Figure 5: 16-Bit Mode (ISA)
(example implementation only - actual may vary)
S1D13503
MEMCS#
MEMW#
MEMR#
READY
8-Bit ISA Bus
SMEMW#
SMEMR#
IOCHRDY
REFRESH
SA0 to SA19
SD0 to SD7
DB0 to DB7
AB0 to AB19
Decoder
SA16 to SA13
IOCS#
IOW#
IOR#
RESET
RESET#
SA10 to SA15
AEN
IOW#
IOR#
Decoder
0WS#
optional
Decoder
SA(1 or 4) through SA9
S1D13503
MEMCS#
MEMW#
MEMR#
READY
16-bit ISA Bus
SMEMW#
SMEMR#
IOCHRDY
REFRESH
SA0 to SA19
SD0 to SD15
DB0 to DB15
AB0 to AB19
Decoder
IOCS#
IOW#
IOR#
RESET
RESET#
Decoder
SA10 to SA15
AEN
IOW#
IOR#
IOCS16#
SA(1 or 4) through SA9
BHE#
SBHE#
Decoder
MEMCS16#
LA17 to LA23
SA16 to SA14
Decoder
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