From: davidsen@ariel.crd.GE.COM (william E Davidsen) Subject: Re: stop me before I hurt myself... Date: 28 Feb 1993 23:08:10 GMT
In article <1993Feb28.015528.9009@sol.UVic.CA>, pmacdona@sanjuan (Peter MacDonald) writes:
|
| I am toying with modifying the floppy driver so that it can
| use a second controller to drive a 3rd and 4th floppy. Questions:
|
| - is it doable?
| - do/should I use a separate DMA and IRQ (3 and 10)
| - any tips?
|
| I am using the AHA1542b which has nice settable features, with
| an IDE drive/ctl. Any pointers a H/W type can give me appreciated.
I can't give you any real pointer other than this: you can disable the
FD on the 1542B (making it like a 1540), and buy a WD (now SMD?) 4
floppy controller for about the cost of a two floppy controller. One
int, just device numbers, and you probably don't have to change a thing
in the driver.
The only reason I can think of for doing something else is to use a
2nd HD+FD, in which case if the driver uses DMA (I can't remember) avoid
channel conflicts.
A friend went down this road with DOS and found that for about $7 in
extra price he could use the stock driver with extra device numbers.
--
bill davidsen, GE Corp. R&D Center; Box 8; Schenectady NY 12345
Windows NT is a *great* program!
It's everything CP/M should have been all along.