ZX-81 / TS 1000 keyboards

[Dave McGuire]

On Dec 2, 2006, at 11:07 AM, Gordon JC Pearce wrote:
>>>> At this late date it would probably be easier to design
>>>> and build an interface so that a common PS/2-type keyboard
>>>> could be used, along with some self-adhesive key-top stickers.
>>>
>>> Seems like overkill - the interface would need more processor  
>>> power than the ZX81, most likely.
>>   Nah, not even close.  In the unit I mentioned in my other  
>> message on this topic, the keyboard encoder processor (which also  
>> did a bunch of other housekeeping) was a PIC16C65B clocked at  
>> 32KHz.  (no typo there)
>
> I don't see that being able to handle talking to a PC keyboard,  
> though.

   Yeah we might have to bump the clock rate up to a screaming  
1MHz. ;)  (I personally have done it at 4MHz with lots of cycles to  
spare)

                   -Dave

-- 
Dave McGuire
Cape Coral, FL