AT&T 3B2 information
Seth Morabito
lists at loomcom.com
Sat Nov 29 12:55:03 CST 2014
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
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