ZX81 and 6116

From: Glen Goodwin <acme_ent_at_bellsouth.net>
Date: Mon Mar 25 22:59:19 2002

> From: Hans Franke <Hans.Franke_at_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
0/0
Received on Mon Mar 25 2002 - 22:59:19 GMT