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From: Richard Atkinson
Date: 2000-08-07
Subject: Re: Plus 4 Database Update

On Mon, 7 Aug 2000, Tim Böscke wrote:

> > Yes it's slightly more restrictive than the Hannes expansion, but *a lot*
> > easier to build and I'd like to convert as many 256K programs to use it as
> > possible, (a) to show its usefulness as a 256K expansion and (b) to make
> > it easier for less technical users to build 256K machines.
>
> Where is the point ? The simple version of Hannes expansion is the most
> supported 256kb extension. Its not more complex than your version.
> (You are using a 6529, ls138 and two ls257 ?)

Not quite, but a similar level of complexity. Do you have details of this very simple Hannes expansion? I don't think I've ever seen a diagram of a circuit that simple. The ones I have seen have been far more complex.

The reason I developed this alternative expansion is that I was already developing one for the C64 and C128 and it uses the same principle, so I can re-use the hardware between the machines. If it really is as simple as the simplest Hannes expansion then I will of course abandon development and build a Hannes 256K plus/4 instead.

Richard