[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [N8VEM-S100:1066] A new S-100 6502 CPU Board

On Aug 20, 2012, at 21:48, "Andrew Lynch" <LYN...@YAHOO.COM> wrote:

> Hi!  At this point since the W65C816S is an 8/18 bit chip I would suggest a
> 16 bit S-100 CPU board built around it.  Then the board could use the
> S-100/IEEE-696 16 bit extensions and be purely 16 bit rather than tweaking
> the S-100 6502 CPU V2 board which is a fundamentally 8 bit CPU design.

My memory of the 65c816 is a bit rusty, but isn't it only an 8-bit data bus with an ALE equivalent pin to latch the upper 8 address bits from the data bus?

I'm thinking that might make it difficult to make a true 16-but board out of it; I seem to recall that the primary benefit of the 65C816 was that it behaved as an 8-bit CPU to the outside world (much like the 8088 as opposed to the 8086).

Or I could be remembering completely wrong. Either way, I'd be interested in a 65C816 CPU board!

- Dave