Robert Smits wrote: > On Wednesday 08 August 2007 19:08, James Knott wrote: > > >> Incidentally, many years ago, I bought a huge Cherry keyboard, without >> any encoder logic. I designed & built my own encoder and used that >> keyboard with my IMSAI 8080. >> > > Had one of those. Mine came with the optional 4K memory, and I entered > programs in with toggle switches I Byte at a time. In 1976 I got cassete tape > drives, and then 8 inch floppy drives (1.2 MB each). Don't miss CP/M all that > much, though. > >
Mine didn't come with any memory. I bought a 16K board, loaded with 4K from another vendor. My system eventually reached 20K. I also used cassettes with it, but never graduated to floppies. I eventually connected it to my ham radio gear, a modem and also a Model 35 ASR Teletype. I designed and built an 8 port serial I/O card for it (only installed 4 UARTs) and in the process found a bug in the 8250A UART chip that National Semiconductor didn't know about. I also wrote a lot of my own software, though I bought an editor, monitor, assembler and BASIC (Scelbal) from Scelbi. I did a lot of learning with that box. Had a lot of fun with it too. It's hard to believe I bought it almost 31 years ago! -- Use OpenOffice.org <http://www.openoffice.org> -- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
