On 12/22/2015 10:43 PM, ste...@malikoff.com wrote: > Back in the late 70s early 80s one of Dad's work colleagues came up with this > circuit for interfacing > an IBM I/O Selectric to a microcomputer. We had one, which we planned to use > with our Fairchild/Mostek > F8 development board, but it never got done - my brother and I wanted a > computer with a screen, not a > printer! So we spent our pocket money (and Dad's too) on an S-100 kit system, > but that's another story. > Recently I found the only remains of our I/O writer, the platen. Sadly I > think it must have been junked, > the platen being kept to roll out photographic prints in Dad's darkroom. > > I just finished scanning, cleaning up the degradation and turning the circuit > into a PDF. These days an > Arduino or RasPi would be a simpler and more flexible way to go, but I hope > you find it interesting > looking at how it was done with TTL and discrete components. > > The circuit was designed by (I believe) Neil Taylor, possibly with the help > of Derek Williamson, both > brilliant IBM Australia CE's. I know my dad always spoke very highly of them. > > It's an 8-page PDF at > http://web.aanet.com.au/~malikoff/misc/IBM_IO_Selectric_interface.pdf > > Regards, > > Steve Malikoff. > >
Thanks. Squirreled away in case I ever find an IO Selectric! JRJ
