[Coco] (very very slightly OT) 6800 emulator

[Bob Devries]

David,

If you're going to emulate more than just the 6800 CPU, as for example, the 
DREAM 6800 we discussed, you'll need to emulate the periphral chips 
associated with that. Specifically, the 6821 PIA chip. Your program will 
need to recognise when the emulated programme accesses the PIA's A and B 
side, as well as the control registers for those.

--
Regards, Bob Devries, Dalby, Queensland, Australia

Isaiah 50:4 The sovereign Lord has given me
the capacity to be his spokesman,
so that I know how to help the weary.

website: http://www.home.gil.com.au/~bdevasl
my blog: http://bdevries.invigorated.org/

----- Original Message ----- 
From: "David Roper" <dave at ebonhost.com>
To: "CoCoList for Color Computer Enthusiasts" <coco at maltedmedia.com>
Sent: Sunday, April 29, 2007 4:21 PM
Subject: [Coco] (very very slightly OT) 6800 emulator


> Yes, call me masochistic..
>
> I'm writing a 6800 chip emulator in Visual Basic :)
>
> So far it initialises the RAM (4k), the registers, inserts some dummy asm 
> code into the RAM and executes the fetch/execute cycle
>
> Only a few opcodes have been implemented yet, but it's working
>
> This is an exercise to get familiar with "how it all works" so I can :
> a) try it in VB with the 6809, and
>
> b) implement it in 6809 assembly to (very slowly) emulate a 6800
>
> No, I don't know why either
>
> -- 
>
> Kind Regards,
>
> David Roper
>
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