25 Mar
2002
25 Mar
'02
11:31 p.m.
If there's a configuration for the 2016, that should work OK with the 6116,
shouldn't it? It's well to keep in mind that it doesn't matter WHICH address
line goes to which address pin on the SRAM, only that it goes to an address
pin. Of course, some designs use addresses as chip selects, since they don't
use all of the address space. In those cases it's important to pay attention
to the association between addresses and the memory map.
Dick
----- Original Message -----
From: "Glen Goodwin" <acme_ent(a)bellsouth.net>
To: <classiccmp(a)classiccmp.org>
Sent: Monday, March 25, 2002 9:59 PM
Subject: Re: ZX81 and 6116
From: Hans
Franke <Hans.Franke(a)mch20.sbs.de>
I think Pete is right here. there was a wire you
had to add if
you used a 4118 (or 6116) instead of the 2114s. I have to grab
the kit documentation to veryfy this.
After checking the schematic I find that there is a link. "Use L1 for 1K
RAM, use L2 for 2K RAM." This tells me that when a 4118 or two 2114s are
used (or a 6116???) there is no need to change the jumper -- it's only
required when using a 2KB 2016 or equivalent.
Digging thru my ZX Stuff I found an _original_
"ZX81 2-K RAM" Kit *G*
Well, it is at least original over here, since it
has been sold by ISS,
the official distributor of ZX81 stuff in Germany.
Wow -- did you ever use the kit?
The kit konsists of a 24 pin socket and a NEC
D446C-2 RAM
I'd guess this is the same as the 2016, and that you need to change the
link to L2 for it to work.
Glen
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