Any chance you have a copy of Cromemco's Macro Assembler for Z80 user
manual?
Douglas Wood
Software Engineer
dbwood_at_kc.rr.com
Home of the EPICIS Development System for the PIC and SX
http://epicis.piclist.com
----- Original Message -----
From: "MHStein" <mhscc_at_canada.com>
To: <cctalk_at_classiccmp.org>
Cc: <mhstein_at_canada.com>
Sent: Friday, August 23, 2002 2:16 PM
Subject: Cromemco 64KZ Info Needed
> The 64KZ is organized as two 32K Blocks (not 16); the A15
> switches control whether that block is in the lower or upper
> half of the 64K range.
>
> Reset out disables that block after a reset to allow the boot
> ROM to use that space on power up.
>
> Override & DMA are only relevant for DMA operations.
>
> Bank switching is done by outputting a byte to 40H
> (this address is set by a jumper block/PROM):
> bit 0 = bank 0, etc., and each block's bank(s) are of
> course set with SW2 & SW3.
>
> Good luck; I've got a manual somewhere that I could scan
> if you haven't already gotten one elsewhere, but probably
> not this weekend. Email me off-list if I can help.
>
> m
>
> -----------------Original Message----------------
>
> From: "Mike Davis" <ipscone_at_msdsite.com>
> To: cctalk_at_classiccmp.org
> Date: Wed, 21 Aug 2002 21:48:17 -0700
> Subject: Cromemco 64KZ Info Needed
> Reply-To: cctalk_at_classiccmp.org
>
> Hope this is not a duplicate. The first one did not show up.
>
> I have just obtained a Cromemco 64KZ board. This has 64K of RAM and
> I'd like to test this out this weekend. Unfortunately, I don't have
> any documentation.
>
> There are 4 banks of RAM (16K x 8) Each bank is labeled "page0",
> "page1", "page2" and "page3". There are also 3 8-pin dip switches:
>
> I have a couple of photos at:
> http://www.msdsite.com/vcomp/cromemco/photos.html
>
> Since this is a 64K board and since there is other memory in my
> system. I'm hoping this allows some sort of bank switching. But
> without docs, I don't know how to use it.
>
> I assume the Bank A/B allow setting which bank a particular 16K might
> reside but am not sure. And the address lines of A15, A14 are a
> mystery.
>
> Is there a way to switch banks by writing to an I/O port? Location?
>
> Can any of you help with an explanation how this works and how I might
> use the switches?
>
> Thanks in advance,
>
> Mike
>
>
>
>
>
>
>
>
> -------------------------------------------
> Introducing NetZero Long Distance
> Unlimited Long Distance only $29.95/ month!
> Sign Up Today! www.netzerolongdistance.com
Received on Fri Aug 23 2002 - 14:54:01 BST