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Re: [N8VEM-S100:4952] Re: ZFDC Controller under control of the PC-BIOS??

John and David -

The V3.5 firmware appears to format 3.5" disks fine on my system.

- Gary

On 8/16/2014 5:18 PM, John Monahan wrote:

Will need a day or two Dave. For others, Archer Electronics supplies WD2793’s


It’s best to phone them however.  Great source of chips BTW.






From: n8vem...@googlegroups.com [mailto:n8vem...@googlegroups.com] On Behalf Of David Fry
Sent: Saturday, August 16, 2014 12:47 PM
To: n8vem...@googlegroups.com
Cc: mon...@vitasoft.org
Subject: Re: [N8VEM-S100:4952] Re: ZFDC Controller under control of the PC-BIOS??


Hi John,


I have just got my ZFDC board working today after waiting 3 weeks for a WD2793 to arrive from China (my first WD2793 from another US supplier was dead).


I'm using ZFDCDIAG.COM to test the board, all my boards are S100Computers.com boards, Z80CPU, RAM/ROM, Console, CF IDE board on default ports.


On ZFDC firmware V2.8 everything seems to work fine, I can format a 3.5" floppy for CPM or DOS, I can perform random read/write tests all OK.

On upgrading to firmware V3.5 I noticed that the format disk command '00' seems to send the ZFDC board into reset with the two left hand digits clocking over (like before the board is initialised), disk random read/write seems to be fine and read sector etc, it only plays up if I try to format a disk


Reverting my firmware back to V2.8 and Format works fine.


Can you check on your board with a 3.5" disk to see if any bugs have crept in to the latest firmware version.




David Fry