[Coco] Dual UART with FIFO Card for the CoCo

[sales at gimechip.com]

Double Oops.
That's what I get for assuming that the Keyboard PIA was just the Keyboard 
PIA.
I've had a look at the schematic and it seems a cartridge based keyboard 
would not be able to provide the keyboard interrupt either. Disk Basic 
doesn't use it anyway but other stuff probably looks for it.
-j
----- Original Message ----- 
From: "Gene Heskett" <gene.heskett at gmail.com>
To: <coco at maltedmedia.com>
Sent: Tuesday, June 15, 2010 9:01 PM
Subject: Re: [Coco] Dual UART with FIFO Card for the CoCo


> 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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>>Coco at maltedmedia.com
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>>
>
>
> -- 
> Cheers, Gene
> "There are four boxes to be used in defense of liberty:
> soap, ballot, jury, and ammo. Please use in that order."
> -Ed Howdershelt (Author)
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> -- Steven Wright
>
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