DESCRIPTION OF PIN FUNCTIONS
NAME SYMBOL
IDE1 INTERFACE
PIN NO.
BUFFER TYPE
23
24
25
30
31
26
IDE1 Enable (Note 4)
nIDE1_OE
nHDCS0
nHDCS1
nIOROP
nIOWOP
IDE1_IRQ
O4
O24
O24
O24
O24
I
IDE1 Chip Select 0 (Note 4)
IDE1 Chip Select 1 (Note 4)
IOR Output (Note 4)
IOW Output (Note 4)
IDE1 Interrupt Request (Note 4)
IDE2 INTERFACE
27
28
29
IDE2 Chip Select 2/SA13 (Note 3, 4)
IDE2 Chip Select 3/SA14 (Note 3, 4)
IDE2 Interrupt Request/SA15 (Note 4)
nHDCS2
nHDCS3
IDE2_IRQ
I/O24
I/O24
I
PARALLEL PORT INTERFACE
138:131 Parallel Port Data Bus
PD[0:7]
nSLCTIN
nINIT
I/O24
140
141
143
144
128
129
127
126
142
Printer Select
OD24/O24
Initiate Output
Auto Line Feed
Strobe Signal
OD24/O24
nALF
OD24/O24
nSTB
OD24/O24
Busy Signal
BUSY
nACK
PE
I
I
I
I
I
Acknowledge Handshake
Paper End
Printer Selected
Error at Printer
SLCT
nERROR
REAL-TIME CLOCK
KEYBOARD/MOUSE
122
124
121
32 kHz Crystal Input
32 kHz Crystal Output
Battery Voltage
XTAL1
XTAL2
Vbat
ICLK2
OCLK2
91
92
93
94
Keyboard Data
Keyboard Clock
Mouse Data
KDAT
KCLK
MDAT
MCLK
I/OD16P
I/OD16P
I/OD16P
I/OD16P
Mouse Clock
7
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