KayPro II keyboard schematic

[Ethan Dicks]

On Thu, Dec 20, 2007 at 10:56:09AM -0800, Chuck Guzis wrote:
> > From: "Andrew Lynch" <lynchaj at yahoo.com>
> 
> > Does anyone have a schematic for *simple* hardware only circuit using a
> > commonly available UART, like an 8251 or 8250, to do the serial to
> > parallel conversion?  I am looking for a schematic which I can easily
> > modify to strap the UART to 300bps operation.
> 
> If you don't want programmable logic, an 8251 or 8250 isn't going to 
> be what you want.  Try a TR1602 or TR1865 or any of the other 
> "hardwire" UARTS--set parity, data bits, etc. by connecting 
> appropriate pins to Vcc or GND; put the serial data in on one pin and 
> take the parallel data out on 8 pins.  No programming needed.

The RCA CDP1854 or the Intersil (and others) IM6402 are great for this,
and shouldn't be difficult to find.

-ethan

-- 
Ethan Dicks, A-333-S     Current South Pole Weather at 20-Dec-2007 at 19:30 Z
South Pole Station
PSC 468 Box 400       Temp   -8.3 F (-22.4 C)   Windchill   -30.5 F (-34.7 C)
APO AP 96598          Wind   13.7 kts Grid 24   Barometer 688.1 mb (10324 ft)

Ethan.Dicks at usap.gov            http://penguincentral.com/penguincentral.html