From: William Levak (wlevak_at_sdf.lonestar.org)
Date: 2007-01-23 09:39:08
On Mon, 22 Jan 2007, Bryan Pope wrote:
>
>
> Hello!,
>
> According to
> http://www.cbmhardware.de/cbmpet/cbm2001mos.php?Lang=D&from=pet2001 ,
> it sounds like it should be fairly easy to adapt say a 2716 or 2764
> EPROM to replace a 6540 ROM and a 2114 SRAM to replace a 6550 RAM.
>
> To do this would I wire all of the Chip Selects together and
> then connect them to the Output Enable on the EPROM/SRAM?
CS1 and CS2 are connected to +5V. CS5 is connected to ground. These
three can be ignored. CS4 is the bank select and is the only required
select. CS3 is actually A11.
It is easier to replace the two 2K ROMs in the same bank with one 4K
EPROM. This can be placed in either of the 2 original sockets.
Pin 16 is the phi 2 timing signal. I think it can be ignored. The 2316Bs
do not use it.
> Also, what is pin 16 on the 6540 ROM for? It is labeled "02"
wlevak@sdf.lonestar.org
SDF Public Access UNIX System - http://sdf.lonestar.org
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