Thanks Jeff,
Yes, these are the switches in the upper left. But knowing that they
are address selection switches does not help much. I presumed they
were. But there appear to be 4 banks of 4K RAM. That should only
require about 4 switches for selection. There are 16 switches
however.
So, if you have the manual, can you say what the specific switch
assignements are?
Also, what is the analog circuitry in the lower right, with the delay
module?
Thanks,
> >I have a Processor Tech. 16KRA (16K RAM) board. There are three
> >components missing on the board.
> >
> >U40 14 pin DIP
>
> 74LS136
>
> >U42 16 pin DIP
>
> 74LS157
>
> >U58 16 pin DIP
>
> 74LS157
>
> >Anyone know what they are? There are also 2 8-pin dip switches that
> >control addressing and who knows what else. Anyone have the switch
> >description?
>
> Is this in the upper left corner of the board? If so it
> controls the page and address line assignments for the address
> selection switches.
>
> All of this info came out of the '16KRA Users Manual', forth
> printing, April 1978.
>
> Jeff
> --
> Home of the TRS-80 Model 2000 FAQ File
> http://www.cchaven.com
> http://www.geocities.com/siliconvalley/lakes/6757
>
>
Received on Wed Aug 28 2002 - 20:31:00 BST