1 Apr
2002
1 Apr
'02
3:53 a.m.
John Honniball wrote:
Something like the CMU Free6809 board would be great, but I'd
prefer to add a CRT coltroller to get a video display. I'd
also want a keyboard interface so that the machine could
be independent of a terminal. Maybe even a disk interface
of some sort, and the AY-3-8910 sound chip, and a parallel
port, and... Oh dear, now I'm making it too complicated!
My SWTP/c contains a third-party board called "the communicator" with a 6845
CRTC. Complexity is low : 6845, 2K sram, character generator and around 10 TTL
IC's. It produces a standard 80x25 output.
The same board also contains a 6821 to interface to a parallel ouput keyboard.
The floppy interface of the SWTPc is also rather simple.
Jos Dreesen