
Apple II Computer Info
DCE Receiver Dibit Clock 18
SCA 120 DCE 2nd Request To Send 19
CD 108.2 DCE Data Terminal Ready 20
CG 110 DTE Signal Quality Detect 21
CE 125 DTE Ring Indicator 22
CH/I 111/2 DCE Data Rate Select 23
DA 113 DCE External Transmit Clk 24
DCE Busy 25
For DCE read Modem and for DTE read Terminal.
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Centronics/Parallel Interface
Signal 36 way connector IBM 25 way connector To
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Data Strobe 1 1 Printer
Data Bit 1-8 2-9 2-9 Printer
Acknowledge 10 10 Computer
Busy 11 11 Computer
Paper End 12 12 Computer
Select 13 13 Computer
AutoFeed 14 (may be Gnd) 14 Printer
OSCXT 15
Logic Gnd 16
Chassis Gnd 17
+5 18
Data Strobe Gnd 19
Data Bit Gnds 20-27 18-25
Acknowledge Gnd 28
Busy Gnd 29
Input Prime Gnd 30
Input Prime 31 16 Printer
Fault 32 15 Computer
Unassined 33-35
Select Input 36 17 Printer
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David Wilson +61 42 213802 voice, +61 42 213262 fax
-=-=-=-=-=-=-=-=-=-=-=-=
Hey I just happen to have my Apple II SSC Installation and Operating
Manual with me.
On page 98, under the section called Connector Pin Assignment:
10-pin DB-25
header Connector Signal name
------ --------- ------------
1 1 Frame Ground
2 2 Transmit Data (TXD)
3 3 Receive Data (RXD)
4 4 Request to Send (RTS)
5 5 Clear to Send (CTS)
6 6 Data Set Ready (DSR)
7 19 Secondary Clear to Send (SCTS)
8 7 Signal Ground
9 20 Data Terminal Ready (DTR)
10 8 Data Carrier Detect (DCD)
Apple II Computer Technical Information : Apple II Family Hardware Info
ftp://ground.ecn.uiowa.edu/2/apple2/miscinfo/hardware : May 2001 : 369 of 572
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