18.018 Can anyone tell me what the pin to pin throughput is on the GS to ImageWriter I cable?
Description
This article is from the Apple II Csa2 FAQ, by Jeff Hurlburt with numerous contributions by others.
18.018 Can anyone tell me what the pin to pin throughput is on the GS to ImageWriter I cable?
Looking at the IIgs serial connector, the pins are numbered as follows:
8 7 6
5 4 3
2 1
The signals on each pin are:
1 Handshake Out (DTR)
2 Handshake In (DSR)
3 Transmit Data minus
4 Signal Ground
5 Receive Data minus
6 Transmit Data plus
7 General purpose input (DCD)
8 Receive Data plus
Shield is frame ground.
The ImageWriter I or DeskJet 500 has a female DB-25 connector, arranged in the
standard order for DTE (Data Terminal Equipment):
1 Frame Ground
2 Transmit Data
3 Receive Data
4 Request to Send (output from printer, probably not used)
5 Clear to Send (input to printer, probably not used)
6 Data Set Ready (input to printer)
7 Signal Ground
8 Carrier Detect (input to printer, probably not used)
20 Data Terminal Ready (output from printer)
The pinout of the cable is:
IIgs (Mini-Din-8 male) Printer (DB-25 male)
1 (HShk Out) 6 (DSR)
2 (HShk In) 20 (DTR)
3 (TxD-) 3 (RxD)
4 (Gnd) 7 (Gnd)
5 (RxD-) 2 (TxD)
6 (TxD+) no connection
7 (DCD) no connection
8 (RxD+) must be conected to signal ground (IIgs pin 4, printer pin 7)
If you have a shielded cable, also connect the cable shield to the Mini-Din-
8 plug's shielding, and to pin 1 and the shield of the DB-25.
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