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RE: [N8VEM-S100:6283] An updated (V3) version of our Dual IDE/CF card S100 bus board

Roger what you have below has all the hallmarks of the MYIDE sector reading/writing being different to that of your CPM BIOS.  I had that, way back.  Do you have a floppy in your system. If so boot CPM from that and era A:*.*   Then PIP things across. A text file first. See that you can first read it from your floppy based CPM.  Then see if you can do so with MYIDE. 


Yes I will add “A” & “B” on the Silkscreen. Good suggestion.





From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com]
Sent: Tuesday, February 10, 2015 9:46 PM
To: n8vem...@googlegroups.com
Subject: Re: [N8VEM-S100:6283] An updated (V3) version of our Dual IDE/CF card S100 bus board


All the suggestions sound pretty good for the updated IDE/CF card.  Would you also consider adding a label on the card silkscreen for the drive ID's?  (Along the top edge of the card?)  A big "A" and "B"??  It was not obvious (to me, anyway) when I first started working with the card, and I ended up putting a large, paper, sticky label there to identify the two "drives".

I also should report that I have still had no luck getting a ver. 2 card to work, and it is not because I'm at the "hi-tech." end of things.  I'm running it with a 4 MHz CompuPro CPU, and the serial card.  I wrote a CBIOS to try to get it working with CP/M 2.2, and it works ..... sorta'.  The CBIOS will permit me to run a "DIR" on the (7, as I remember it) CF drives, but try as I might, I was not able to get a "clean" listing.  There are a bunch of blank file names in the displayed directories.  When I run DU on those "drives", sure enough there are a few (4, as I remember it) sectors of zeros in with all the "E5"'s.  I used DU to "write" "E5" into those sectors, but then when I turn around and read and display them, they are zero!  Nothing I have tried has allowed me to write anything in those sectors.  They show up (probably at different places?) in all 7 "drives" on the CF.  I tried several different 8255's (along with the suggested mods. -- remove SIP, change 7403 to 74LS00, etc. etc.).  I did use NSWP to copy files into some of the CF "drives", and they appear to copy correctly in *most* cases, but there were also some strange things happening in some of the directory allocations for the resulting files .... in addition to the "zeros problem."


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