osiweb.org

Hello,

I have an OSI 540A 64x32 B&W character video board for sale. I believe there is a mod for this board that let's you add a cassette port. (That mod is not installed.) This board was a working pull about 6 years ago but I can't vouch for it now, so sold as-is. Please make an offer via pm if interested.

The OSI540A was sold with the OSI500 CPU board to make a complete C2P cassette & video based system. The cassette I/O was handled by the 540A board for the serial port on the CPU board. Some versions of the 540A had 6 bit video for uppercase-only ASCII. Other versions included 4 additional 2102s and used the OSI chargen ROM for full ASCII and OSI graphics.

Does your 540A have the 2513 chargen ROM or the 2316 OSI graphics ROM? Or how many 2102s are installed? Thanks

I'll take a look tonight and let you know.

So the board I have is fully-populated with RAM and has the 2316/OSI graphics ROM. Just posted it on eBay