Interfaces of IBM and PC-1350


PC-1350 serial interface 15 pin IO

contrast wheel
1protective ground for repairs(not used) -
2transmit dataSD out
3receive dataRD in
4ready to sendRS(HIGH: sends carrier) out
5clear to sendCS(HIGH: transmits)in
7groundGND(level 0 for transfer)-
8carrier detectedCD(HIGH: carrier detected)in
105 voltsVCpower supply-
11ready to receiveRR(HIGH: receiving possible)out
12periph. signalsPAK(for serial printers from SHARP)in
135 voltsVCpower supply-
14data terminal readyER(HIGH: data terminal ready)out
15periph. signalsPRQ(for serial printers from SHARP)out

The pocket doesn't use all of these pins:
Pin 5 high is enough to make it send data.
On pin 11 only it tells that it's ready for receiving data.

PC-1350 printer interface 11 pin IO

1not used- -
2+6VVCCPower supply-
4line-Port F Bit 2out
5line-Port F Bit 1out
6LOAD-Used by CLOAD, you can get this line through TEST 128in
7SAVE-Used by CSAVE, you can set this line through port C, bits 4,5 and 6out
8line-Port B: Bit 7IO
9line-Port B: Bit 6IO
10line-Port B: Bit 5IO
11line-Port B: Bit 4IO

Desktop-PC serial interface 9/25 pin IO

9 pins25 pinsNameDescriptionDirection
18CDCarrier Detect - Modem has carrier and is onlinein
23RxDReceives datain
32TxDSends data with +12V at HIGH and -12V at LOWout
420DTRData Terminal Ready - computer is ready for receiving dataout
66DSRData Set Ready - The other computer is ready to receivein
74RTSRequest To Send - This line makes the other to get ready for receivingout
85CTSClear To Send - When the other RTS sends HIGH to this line the computer starts transmittingin
922RIRing - an incoming call is detected by the modemin

Hardware ports

Port B (&5D = 93 internal RAM)

BitPinS=15 D=11-pin-interfaceI=input,O=output

Port F (only output, &5E = 94 internal RAM)

BitPin serial

Copyright © Simon Lehmayr (Parts of my page were made with the help of Laurent Duveau)
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