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(a)msdsite.com> To: cctalk(a)classiccmp.org Date: Wed, 21 Aug 2002 21:48:17 -0700 Subject: Cromemco 64KZ Info Needed Reply-To: cctalk(a)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