FPGA VAX update, now DIY TTL computers

Patrick Finnegan pat at computer-refuge.org
Thu Nov 3 22:13:18 CST 2005


Tony Duell declared on Thursday 03 November 2005 20:52:
> > Tony Duell wrote:
> > >Yeah, ad I can store 16 bits per location if the high byte is the
> > > same as the low byte :-)
> >
> > What you want is the 25120  write only memory.
> > http://www.ganssle.com/misc/wom1.jpg
> > http://www.ganssle.com/misc/wom2.jpg
>
> Yeah, I've got a reprint of the data sheet in the back of the lab
> manual for TAoE.
>
> More seriously, I have a machine with 16K * 48bit words of memory that
> can be written under program control, but which can't be read back by
> said program. This memory has nothing to do with any peripheral
> device.....

Is it, say, a microcode store, on maybe a PERQ of some sort?

Yes, I do pay attention to what people talk about alot on here. :)

Pat
-- 
Purdue University ITAP/RCAC       --- http://www.rcac.purdue.edu/
The Computer Refuge               --- http://computer-refuge.org



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