KayPro II keyboard schematic

[Jim Brain]

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.
>
> Cheers,
> Chuck
>   
Wow, that's a lot to pay for a hardwire solution:

http://store.americanmicrosemiconductor.com/tr1602.html

A TINY2313 AVR will do the job in a single IC for a few bucks.  Heck, 
I'd even program it for you if you told me the specifics (how to signal 
that a new byte as arrived, for example)

Maybe if you have a TR1602 lying around, or maybe that place is ultra 
expensive.

Jim