[Coco] CoCo 3 patch question

[Art Flexser]

If you put in a STA $FFDE to go to ROM mode, all the CoCo 3 patches
will disappear, which I would think would solve the problem.

Art

On Mon, 24 Nov 2008, Roger Taylor wrote:


> Does anyone know if the CoCo patches the Disk ROM if it's available?

> 

> The reason I ask is that I'm developing an embedded system EPROM 

> which poses as Disk BASIC by having the "DK" bytes at the top.  From 

> M.E.S.S., a CoCo 1 or 2 boots into my ROM fine and shows a title 

> screen, but from the CoCo 3 modes, my title text has about 5 or 6 

> bytes of garbage in it, which tells me something is changing part of 

> the area where my text is stored within the ROM.

> 

> I tried starting my ROM with:

>    fcc "DK"

>    jmp Start

>    fzb 256  (CCASM's way of filling with 256 0's)

> Start nop

> 

> And this works in the emulator, but I'm not sure what OTHER bytes are 

> altered by the CoCo 3 patch routines.  This leads me to ask yet 

> another question... how does the CoCo 3 (if it's patching Disk BASIC) 

> deal with the other DOS brands?

> 

> Anyway, I've created a nice ROM which turns a CoCo into an embedded 

> server.  It boots up hands-free-ready to accept MP3 cassette files or 

> those sent by cocotape.exe from a PC, or a real tape deck, etc.  As 

> soon as the file is over, it executes.  This allows the control 

> program to be uploaded just by sending the audio stream into the CoCo 

> once. If you hit RESET it runs the control program again (or last 

> program uploaded) instead of resetting the CoCo back to a hard 

> start.  The control program can be a game or any other single-record 

> ML tape file.  I've been sending games to the remote CoCo for my kid 

> to play and all he's doing is toggling the power button when he wants 

> a new one sent.  The game starts up automatically.  Talk about 

> nice.  The serious side to this project is that no keyboard or 

> monitor is required if the plans are to do an emedded project.  Just 

> send power to the CoCo board and run a cassette cable to an MP3 

> player, select (I'll call it control.mp3) and walk away.  Or connect 

> a laptop speaker, type cocotape control.bin, and walk away.

> 

> -- 

> Roger Taylor

> 

> http://www.wordofthedayonline.com

> 

> 

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