24 Aug
2005
24 Aug
'05
3:58 a.m.
In message <0ILP004N8EKHJER2 at vms040.mailsrvcs.net>
Allison <ajp166 at bellatlantic.net> wrote:
It seems this drive is jumperable. I found three jumpers (actually 0R links)
next to the speed-select wire... Now if I could just find out which one
locked the drive at 300RPM (or made it pay attention to the edge connector).
Later.
--
Phil. | Acorn RiscPC600 SA220 64MB+6GB 100baseT
philpem at philpem.me.uk | Athlon64 3200+ A8VDeluxe R2 512MB+100GB
http://www.philpem.me.uk/ | Panasonic CF-25 Mk.2 Toughbook
REALITY.SYS corrupted: reboot universe?
Unless you use a drive that spins faster then the
500khz rate is fine.
If it doesn't, I'll speedhack it to run at 300.
The only drive I've got that runs at 360 is a Y-E Data YD-380B. It completely
ignores the speed select pin, even though it's wired to "something" on the
PCB...
There are no visible jumpers anywhere, besides DS0 and DS1.
Yep, remember the worst case for "fast is 13us!
I'd plan for that.
Also the slow rates will give you nominal 32us (27us worst case).
Eek! Interrupt-mode it is then.
Or a S100 board like the Compupro Disk1A.
Time to google for a Disk1A manual (and hope that it includes schematics)...
I've done this at enough times to loose count on
S100, multibus, ISA8 and 16
Z80 raw cpu bus (single board), 8085 single board, 8088 single board and
even with an 8749. The Floppy side is largely done for you of you look at
the app nots, existing board manuals and that one site some had a pointer to.
I don't have any of the NEC 765 appnotes... I've got the i8272, uPD765 and
R6765 datasheets, but not the matching appnotes.
Same applies to the NEC V20 CPU I've got lying around - I've got the data,
but not the hardware and software manuals.
The MFD520 and 920 is good and for 5.25 I really like
the teac FD55GFR
as that will do most 40 and 80 track reads including 1.2m. If you intend
to write honest 360k formats with 5.25" drives a FD55B is a good choice.
There are other 5.25 drive that would make goood equivelents to both teacs.
I wouldn't mind getting an FD55, actually. Just that they don't seem to
appear on ebay very much these days.
Easy way to
solve the 360rpm issue: Find the SPEED_SEL pin on the motor
controller, lift the pin then wire it to the edge connector.
Yes, saves pain.