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AE memory for //c
- Subject: AE memory for //c
- From: robert-s@cs.aukuni.ac.nz (Robert Sheehan )
- Date: Wed, 9 Jun 1993 08:57:35 GMT
- Newsgroups: comp.sys.apple2
- Organization: Computer Science Dept. University of Auckland
Can anyone tell me why my AE ZRam II with 1 MB only lets me use 15 of the
16 64K banks of memory. I don't think it is broken, they just made them
this way. It is the //c equivalent of an aux mem board. You change banks
by hitting $C073, bank zero is normal aux memory.
I've got this horrible feeling the answer is to do with the number of
bits they used for bank selection (16 needs 5 bits). In which case they
should not have advertised it as a 1 Meg board since you can only use
960 Kbytes.
Whilst on the topic there is a lovely bit of code in the manual which tells
you how much aux memory you have available, with a couple of seemingly
worthless lines. It took me a moment to work out that these lines are
there to make other aux memory boards fail (I used to have a Checkmate
board). I thought that was pretty mean as some software developers used
the code without thinking thereby making their software only work with
AE hardware. I don't know which was worse, the dumb software writers or
AE for trying to zap the opposition.
OK, I suppose they were the first to develop aux mem boards but still.;)
--
------- Robert Sheehan ---- robert-s@cs.aukuni.ac.nz -------------------------