13 May
2004
13 May
'04
3:36 a.m.
On Thu, 13 May 2004 00:04:57 +0100 (BST)
ard(a)p850ug1.demon.co.uk (Tony Duell) wrote:
When I took it off the stand, water poured out of the
hollow
baseplate
When I took the fan out of my drive I poured out about a good hand full
of rust.
The real question is: What is more time consuming? Rebuild the RK07 or
build a solid state RK07 replacement.
Anyway, I cleaned it all up, cleaned the heads,
cleaned the
connectors, lubricated the fan etc. And then tried it out. Worked
fine!
Well. I have to take apart the base plate to clean it inside. This is
destructive, as the base plate is welded. I already bought a sand
blasting unit to "clean" the UniBus box of the machine.
Wouldn't it be simpler to make a Unibus card with
the flash memory and
interface on it that pretended to be a disk controller?
I don't know. I
suspect that I would need a FPGA for bus glue logic and
maybe a microcontroller a bit more powerfull then a 8 bit Atmel AVR.
This seems to be more complex then a solid state RK07 replacement. A
RK07 replacement should be doable with a hand full of serial <=>
parallel converter chips (data and controll words are transfered
serially between drive and controler), a 8 bit Atmel AVR and a FLASH,
IDE, whatever disk.
The Unibus is fairly well documented and quite simple.
I know. I have the DEC "pdp 11 bus handbook".
Do you have the printsets for the drive and
controller?
No. I found only the User's Manual.
--
tsch??,
Jochen
Homepage: http://www.unixag-kl.fh-kl.de/~jkunz/