Commodore PET and RS232

[Dinotech]

I have CBM 3032 and want to use it as dumb terminal. From other people experiments i understand, for that purposes can be used "user port" and TTL adapter to RS232 serial port. But what i don't understand - how from Commodore Basic directly send/receive data via user port, without loading any program for that. Because - i don't have any datasette or floppy drive for that computer. I would appreciate any advice.

 

[Hutch]

Commodore didn't include any serial communications with the PET. Unlike the VIC-20 and C64, device #2 on the PET is a second cassette interface.
There was a modem sold that connected via the IEEE 488 port, but no RS232 or serial device.

There have been a few programs created that use the same or similar machine language "bit bang" routines to send and receive data via the user port, but each program has to include it's own routine. There's nothing in ROM and AFAIK nothing that will work with basic.

Currently the program to use is call PET Term. Link https://github.com/ChartreuseK/PETTERM
It will require an RS232 voltage level conversion if you plan to connect to standard RS232 devices.
The MAX232 chip or it's variants are the easiest way to do that.
https://youtu.be/_6Hpgcr85mo