AT&T 3B2 information

[Mark Wickens]

Don't give up Seth this is a worthy cause

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> On 29 Nov 2014, at 18:55, Seth Morabito <lists at loomcom.com> wrote:
> 
> Folks,
> 
> For some reason I got it in my head that writing an AT&T 3B2 emulator
> might be a good idea. That idea has pretty much been derailed by lack
> of documentation.
> 
> I have been unable to find any detailed technical description of any
> 3B2 systems. Visual inspection of a 3B2 300 main board reveals the
> following major components:
> 
>  - WE32100 CPU
>  - WE32101 MMU
>  - 4 x D2764A EPROM
>  - TMS2797NL floppy disk controller
>  - PD7261A hard disk controller
>  - SCN2681A dual UART
>  - AM9517A Multimode DMA Controller
> 
> How these are addressed is anybody's guess.
> 
> To even dream of doing an emulator, I at least need to know the system
> memory map -- what physical addresses these devices map to. Without
> that it's pretty pointless to get started.
> 
> If anyone has access to this kind of information, please drop me a
> line. Otherwise, I'll just put this one on the far-back burner!
> 
> -Seth
>