[Coco] Dual UART with FIFO Card for the CoCo

[Gene Heskett]

On Tuesday 15 June 2010, Darren A wrote:
>On 6/15/10, sales at gimechip.com wrote:
>>  I was going to design an interface that plugged into
>> the cartridge port - this way the CoCo wouldn't even have to be opened
>> and it would not matter which CoCo Model you have - the keyboard
>> connector wouldn't matter. My thinking was that whenever the CoCo made
>> an attempt to access the keyboard memory areas, the plug in cartridge
>> would assert SLENB* disabling the internal devices and replacing them
>> with the circuitry inside the keyboard interface cartridge. It seems
>> plausible -
>
>---
>
>If you use SLENB to disable PIA 0 whenever it is accessed, then you
>also lose the ability to read the joystick fire buttons, control the
>analog mux, and use the VSYNC and HSYNC PIA interrupts.
>

Ooops.

>Darren
>
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>


-- 
Cheers, Gene
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