ZFDC Controller under control of the PC-BIOS??

[Frank Schieschke <f.schi...@googlemail.com>]

I have no luck with the floppy utilities from the "X" PC-BIOS (8086 Monitor 10.32).
From the ZFDCDIAG program all is working fine and i can read the real data from the 3,5" MS-DOS floppy.
All other functions like seeking, formatting and R/W tests are all work fine.
But every access to the ZFDC controller from within the PC-BIOS shows only like this:

Booting MS-DOS from 5" Floppy Disk
Initilizing 8259A PIC (Port 20H, Ints 0 & 1 only)
ZFDC Board Initilize OK

Floppy Sector Read Error. Error returned = 3DH

Boot sector read on floppy drive failed.

This 3DH error appears from all floppy related functions.

My configuration at the moment:
Z80 CPU V2 with V5.02 monitor. 6MHz
80286 Master Slave CPU card.  6mhz 
V2 MS-DOS Support board with V10.32 monitor in EEPROMs.
4mb SRAM board, 1MB populated
System Monitor Board V2
ZFDC Floppy controller
CompuPro Interfacer1 I/O board wired as an Prop I/O board.
Dual IDE Board with CP/M 3.0 - "Yoda" CPM 3 image incl. Z-rtc.com

Frank