GLINK-LT - User Port RS232 for Commodore 8-bit Computers

Submitted by GG on Sat, 02/24/2018 - 00:41
Project Status

glinkltGLINK-LT is a modern clone of the Commodore VIC-1011A RS232 User Port adapter for Commodore 8-bit computers. The adapter is fully supported by the standard Commodore BASIC at up to 2400 baud. Jumpers allow the card to be configured as a UP9600 for 9600 baud operation in Novaterm and Striketerm. A reset button and a 5V header are also provided for added convenience.

The schematics is practically identical to the older GLINK-LT-B00 version. The only change is the jumper block that is now a single part.
Two MAX232 are used as RS232 level translators (U1 and U2). U3 inverts the control signals as expected by the original commodore software. R1, R2 and R3 provide reasonable default to the control lines in the case of 3-wire RS232 cable. Jumper blocks J3 and J4 enable UP9600 functionality.


Jumper Configuration

J4 VIC-1011 UP9600
1-2 OFF ON
3-4 OFF ON
5-6 OFF ON
7-8 ON ON
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