10 Aug
1998
10 Aug
'98
6:12 a.m.
On Aug 10, 6:42, Ethan Dicks wrote:
uVAX,
Again, it should. It should be capable of using up to two ST-412 interface
drives to emulate up to four RL02s, though I never tried mine with more
than one. IIRC there's a small overhead, so you need slightly more than
20MB to emulate two drives.
RLV12
Me neither. I don't have the full docs, just a pair of layout diagrams,
switch table, and a few bits about formatting. Unfortnately, all the
formatting stuff seems to use a program which I don't think I have handy.
At the back end of the board is either a 34+20 pin connector, or two
individual headers. As Ethan said, the 34-way is the control bus
(daisy-chained like floppies for multiple drives) and the 20-way is the
data. J3 is the second 20-pin data connector (for the second physical
drive). Pin 1 of the 34-way connector is the end nearest the LED, and the
other connectors are fitted in the same orientation.
There are five switches:
S1 ON = ECC used to transparently correct errors where possible
OFF = ECC ignored; used for diagnostics
S2 ON = bootstrap enabled
OFF = bootstrap disabled
S3,S4 Identify the last logical RL unit on physical drive 0. So
the settings are as follows:
S3 S4 Physical 0 Physical 1
off off DL0 Dl1, DL2, DL3
off on DL0, DL1 DL2, DL3
on off DL0, DL1, DL2 DL3
on on DL0, DL1, DL2, DL3
S5 ON = use secondary address for bootstrap ROM: 175000
OFF = use primary address for bootstrap ROM: 173000
Factory setting is all switches off.
There are 10 jumpers:
JP1 (near U22) removed (etch cut) allows data loopback for diagnostics.
JP2 (near U32) removed (etch cut) aborts controller pre-comp logic when
writing, for diagnostics.
JP3,4,5 (near U70) sets interrupt levels:
level JP3 JP4 JP5
4 B-C B-C B-C
5 B-C B-C A-B
6 B-C A-B B-C
7 A-B A-B B-C
JP6 (near U22) "Must be removed"
JP7 (near U22) "Must be removed"
JP8 (near U5) "Must be removed"
JP9 (near U32) "Must be installed"
JP (near U32) "A-B must be installed, A-C must be removed"
There's also a socket for a special (customer) bootstrap at U38.
That's about all I can tell you, I'm afraid. I'll have a look for a copy
of the formatting program (which came on an RT11 floppy, I think) but I'm
not hopeful... I don't have the controller any longer.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Subject: Re: DQ614 and other Q-Bus questions
On Sun Aug 9, 15:20, Zane H. Healy <healyzh(a)ix.netcom.com> wrote:
> Hmmmm, now this sounds ponentially very cool!
According to the Field
Guide
> this is a "Dilog ST-506 emulation of four
RL01/02".
Yes, it is. I think I might have been responsible for that highly
informative entry ;-)
> Any one have info on
> this, and will it work in a system that has actually RL02 drives
attached?
It would make
it a lot easier to get data on to the Hard Drive if I can
just copy it from a RL02 to a fake RL02.
Presuming that it can be strapped at the alternate address (DLB0 on a for example. Dunno the CSR), it should work fine.
It needs a different PROM to switch the address/vector. The standard PROM
at U38 is labelled 91265D (according to my old notes) and the
alternate-address PROM is labelled 91578A (old notes again). YMMV :-)
What kind of
Hard Drives will work with it?
The one I have used to have a Rodime 10 Mb 5.25" full-height MFM drive
attached to it. I'd love to hear if an ST-251 would work. > Is there any kind of setup for it? There is a
funky 20-pin connecter
> marked J3 that might be for jumpers or a ribbon cable though I don't
really
> want to try to attach a ribbon cable to it, as
it's rather wierdly
attached.
It's an ST-506 interface - 20 pin for analog data (one per drive, up to 4
supported, depending on the exact nature of the controller in question),
and 34 pin (digital signals) for control (one per controller, including
up to 4 drive select wires).
Two physical drives, in this case.
Does it have
any kind of boot ROMs?
Almost certainly not. It is a register-level emulation of the RLV11 or (don't know which one). It would use the regular
DL boot ROM on your
system.
It does have a bootstrap, but I think the emulation is RLV11 (it's to old
to be RLV12, I think). You can switch the bootstrap off, though. The code
will boot either a DY or DL device.
Any idea on
how well it would co-exist with a DQ606?
No idea.