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B. 3 PIR DESCRIPTION
TABLE B-1
Pin Description
Pin
1/0
SYMBOL
Signal name and Description
01
0
AUTF
AUTFD1:
When this bit is set to "1", the set paper is
automatically fed one line after the printing is
finished.
02
0
STRB
STROB1 :
Strobe signal used when data is sent to the printer
03
Vcc
+5vdc
04
GND
Ground
05
I
TEST2
P12AO: Test pin. (Not used)
06
I
TEST1
P12BO: Test pin. (Not used)
07
I
HRESET
HRESETO
HDD reset
08
I
XINT
XINT1: Interrupt Request from the HDC
09
I
HDDSL
HDDSLO: HDD select signal
10
0
HRST
HRST1: HDD Reset signal
11
0
IRQ5
IRQ51: Interrupt Request 5 signal
12
0
HDCS
HDCSO: HDC chip select signal
13
0
HDIR
HDIR1:
Direction of the system data bus towards HDC
14
N.C
15
GND
Ground
16
N.C
17
0
FDRDY
FDRDY1: When FDD is selected, this signal becomes
FDRDY1, that is, "OR" for both of DSLB and DSLA
18
0
DRQ2
DRQ21: DMA request to 82C37, but is suspended
19
0
IRQ6
IRQ61: Interrupt request to 82C59
20
0
TC1
TC1: Output signal (inverted fromTCO signal) to EXP.
slot
21
I
TCO
TCO: Terminal count output from 82C37
22
I
PRTSL
PRTSLO: Printer port select signal
23
I
FDDSL
FDDSLO: FDD port select signal (3FO - 3F7H)
24
0
BDLED
BDLEDO: B Drive LED turn on signal
25
I
D7
SYD71: System data bus bit 7.
26
I
AO
AOB 1: Address bit 0
27
I
lOW
10WRO: 1/0 write command signal
B-3
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