17 Jul
2006
17 Jul
'06
9:22 a.m.
On 7/17/2006 at 8:55 AM Dave Dunfield wrote:
If it's an 8-bit card, the ROM may simply be a BIOS
which provides support
for higher density drives or other features. Most enhanced FD controllers
I've seen for XTs have a BIOS ROM.
I don't know this chip, however if it is a 765 clone, it should work with
ImageDisk. If the board has HD capacity and it is implemented the same as
the AT,
then it should work with ImageDisk as well. ImageDisk
does not use BIOS at
all
when performing transfers, so it needs standard
hardware.
At least that's right for my ISA sample. However, my notes on the chip
also tell me that it doesn't support FM, in spite of what the chip docs
say. It could be a mistake on my part, but I'm pretty certain I was
careful.
The Zilog 765 chip was very common, as was the UM8272A--both are licensed
clones of the NEC 765. The one that doesn't seem to be a direct clone is
the National 8473--it handles 128 byte sector MFM read/write/formatting
just fine.
Cheers,
Chuck