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S1R72104 Technical Manual
4
EPSON
Rev.1.1
5. PIN DESCRIPTION
The control signal with “X” at the head of a pin name is LOW-active.
Pin No.
Symbol
I/O
Functional description
Remarks
SCSI interface-related matters (18)
97
XSDB0
Is/Otr SCSI data signal (SD0 to SD7)
Drive capability 48mA
95 XSDB1
92 XSDB2
90 XSDB3
88 XSDB4
86 XSDB5
84 XSDB6
81 XSDB7
79
XSDBP
SCSI data parity signal
Drive capability 48mA
77
XSATN
I/Ood SCSI ATN signal
Drive capability 48mA
73
XSBSY
I/Ood SCSI BSY signal
Drive capability 48mA
71
XSACK
Is/Otr SCSI ACK signal
Drive capability 48mA
69
XSRST
I/Ood SCSI RST signal
Drive capability 48mA
68
XSMSG
I/Ood SCSI MSG signal
Drive capability 48mA
66
XSSEL
I/Ood SCSI SEL signal
Drive capability 48mA
65
XSCD
I/Ood SCSI C/D signal
Drive capability 48mA
63
XSREQ
Is/Otr SCSI REQ signal
Drive capability 48mA
61
XSIO
I/Ood SCSI I/O signal
Drive capability 48mA
Port interface-related matters (20)
38
XPRD
Is/O Port lead signal
Drive capability 3mA
39
XPWR
Is/O Port right signal
Drive capability 3mA
40
PDREQ
Is/O Port DMA request signal (also operable in negative logic)
Drive capability 6mA
37
XPDACK
Is/O Port DMA ACK signal
Drive capability 3mA
42
PD0
I/O
Port DMA data bus signal (PD0 to 15)
Drive capability 3mA
44 PD1
47 PD2
49 PD3
53 PD4
55 PD5
57 PD6
59 PD7
58 PD8
56 PD9
54 PD10
52 PD11
48 PD12
46 PD13
43 PD14
41 PD15