27 May
2008
27 May
'08
12:28 p.m.
Eric Smith wrote:
branchuk wrote:
That sounds about right.I think I bought that DDJ for something about
FORTH rather than the mac. Lazy Evaluation for FORTH words.
Back then you got a paper listing and all that stuff. Not like now
where you buy the MAG so you can order a CD rom with the CODE
that only works under some unfordable windows development
system.
I think fatten your mac had you piggy back your
64K drams and
bring out CS? to the address decoder.
Nope. DRAMs don't have a CS signal, they have RAS and CAS. Also, there
wasn't any decode for another bank of 64K DRAMs. The upgrade was to
replace the DRAMs with newfangled expensvie 256K parts, and add a
74S257 multiplexer for A8. I don't recall whether the board had
pin 1 of the DRAMs wired together; if not you'd have to do that
as well.
Eric