DEC RK07 drive interface specs wanted

From: Jochen Kunz <>
Date: Thu May 13 02:36:53 2004

On Thu, 13 May 2004 00:04:57 +0100 (BST) (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.
Received on Thu May 13 2004 - 02:36:53 BST

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