[Coco] (very very slightly OT) 6800 emulator

[David Roper]

Hi Bob,

That's quite right - I'll be using dedicated functions for writing and 
reading to the virtual machine's RAM, so I can easilly intercept any 
reads/writes to/from "interesting" addresses

I'm going to focus on getting the 6800 core fully-functional first, then 
expand the emulation to include associated chips

This is more of a learning exercise than an attempt at a 
fully-functional emulation of any particular machine at this stage, but 
it'll be fun, none-the-less :)

I'm snowed-under with web development work and two kids with chicken pox 
at the moment, so haven't had much of a chance to progress, but I'll 
keep you all updated on my progress

Kind Regards,

David Roper

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Bob Devries wrote:
> 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
>>
>> ------------------------------------------------------------------------- 
>>
>> *My Graphic Garden / Ebonhost*
>> *website:* www.mygraphicgarden.com.au
>> *phone:* (02) 4268 5934
>> *fax:* (02) 4268 6456
>> *mail:* po box 624 thirroul, nsw 2515
>> *email:* dave at ebonhost.com
>> ------------------------------------------------------------------------- 
>>
>> *Legal: The information contained in this email communication, and 
>> any attachments, is confidential.
>> Please don't distribute, copy or quote. If you have received this 
>> communication in error, please notify
>> customerservice at mygraphicgarden.com.au immediately.*
>>
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