Anyone else spot that one near the end of the movie? It was one of the
80-column models.
Not sure what any of the other "30-year old" computers were.
-Frank
> I finally have a scanning system setup here for archiving documents.
On a tangentially related note, we've just started an effort at the VC
Forum to track scanned documents.
Think of it as an index to available online documents of interest to
vintage computer collectors.
It's just in its infancy, but I think it's a great idea and I hope we
have success with it.
The thread at http://www.vintage-computer.com/vcforum/viewtopic.php?
t=241 covers my interpretation of the effort. I'm sure it will evolve
somewhat over time.
Please feel free to drop by and comment or help out!
Thanks,
Erik Klein
www.vintage-computer.com/vcforum
The Vintage Computer Forum
I got a lot of manuals and schematics - I'll prepare a list. Since my
brother got a powerful scanner at work, he might be able to scan the
documents, which are not at your site already.
--
I have quite a bit of material also which I will put up now that there
is someone who needs it. What I don't have that would be very handy would
be documentation on the fixed head disc, and disc interface.
I got a Varian(Univac) Data Machines 620L100 in very good conditions
including a fixed-head disk, a teletype and a Tektronix storage display.
This machines is dated to 1974.
--
Is it an ADAPTS system (is there an A/D panel just below the CPU) ?
I have one. It is very likely that there is a lab oriented BASIC
(possibly still in core!)
If there is any way to save the contents of memory before you fiddle
with trying programs, it would be a GOOD THING. I haven't touched
my machine because I don't want to destroy what may be the only copy
of that program.
I would also suggest not spinning up the disc right away.
I assume you aren't getting any documentation or external software
with it?
On Jul 23, 1:34, <rogersda(a)cox.net> wrote:
> Jerome Fine <jhfinexgs2(a)compsys.to> wrote:
>
> > [...] In addition,
> > I also added a bounce buffer in DYX.SYS so that
> > a user buffer above 256 KBytes could be used
> > with the 18-bit hardware addresses in the floppy.
>
> Actually, for device I/O, it doesn't matter whether
> one is using 16, 18, or 22 bit addressing. The PDP-11
> I/O page is defined as from 28KW-32KW, which is entirely
> within the range of 16bit addressing.
It's true that the I/O page always appears *to software* at *logical*
addresses 160000-177777. This is fine for the processor, which has
logic to deal with it. Nevertheless, the *hardware* addresses which
appear on the bus need to be 160000-177777, 760000-777777, or
17760000-17777777 depending on whether the system uses 16, 18, or
22-bit addressing. To make life easier, DEC provide a "Bus Bank Select
7" signal, which most I/O devices use to detect access to the I/O page.
What Jerome is referring to, however, is the DMA operation. An RXV21
or RLV11 (and some other devices) can only perform data transfers to
18-bit addresses. Data is transferred only by DMA; you can't transfer
data from the device controller, only commands and status. Most DEC
operating systems expect data transfers to be able to load/save from
data buffers at arbitrary (physical) addresses; therefore drivers in
some operating systems have the option to use a bounce buffer mapped to
low memory, for 18-bit devices. They therefore transfer the data in
two stages: under program control between the bounce buffer and the
required address, and letting the DMA transfer between bounce buffer
and actual device.
--
Pete Peter Turnbull
Network Manager
University of York
Jerome Fine <jhfinexgs2(a)compsys.to> wrote:
> I agree there needs to be a SYSGEN to be able to use
> all 3 * RL02 drives with the DL(X).SYS device drivers
> and the hardware handles ONLY 18 bit addresses for
> both the DYX.SYS and DLX.SYS device drivers.
>
> BUT the RLV11 and the RXV12 from DEC also
> managed to handle only 18-bit addresses. So the
> DSD box was completely compatible with the stock
> (distributed) V4.00 of RT-11.
>
> However, V4.00 code in DY.MAC contained the
> extra instructions to use a double-sided media which
> would probably have been called an RX03. And
> although those extra instructions had bugs (after all
> they had never been tested) and were removed by
> V5.00 of RT-11, I did fix the bugs and ran a DYX.SYS
> device driver under V5.03 of RT-11 using the DSD
> 8" floppy as a double-sided drive. In addition,
> I also added a bounce buffer in DYX.SYS so that
> a user buffer above 256 KBytes could be used
> with the 18-bit hardware addresses in the floppy.
Actually, for device I/O, it doesn't matter whether
one is using 16, 18, or 22 bit addressing. The PDP-11
I/O page is defined as from 28KW-32KW, which is entirely
within the range of 16bit addressing.
Dale Rogers
DEC/Compaq/HP
Does anyone know what a DEC AD0L-A is?
Looks like some sort of A/D equipment. Mounting panel
holds a number cards and has a small power supply near
one end.
Cards present (looks like a bunch are missing, from
the amount of wiring on the backplane) are:
A220
A708
A862 bipolar high speed A/C convertor
G701
M100
M111 invertors
M161 binary to octal convertor
M216 flip-flops
M602 pulse generator
M636
Anybody know what the mystery cards are?
Thanks,
Bill
Sorry all the email got backed up on cctech for a few days. I just got back
>from the Great Oklahoma Excersion(tm) with Guy to pick up Jeff Sharp's
collection - hence I was away from the list for a few days.
God was Oklahoma HOT!!! Lots of pictures of the move were taken. I'm shipping
my pictures off to Guy and he'll put them up on his website sometime I'm
sure.
Regards,
Jay West
The RA60's should be opened with power on. However,
unlike RL02's, the solenoid can be overridden with a
thin blade.
> From: Corda Albert J DLVA <CordaAJ(a)NSWC.NAVY.MIL>
> ... As I recently acquired a VAX6630, I am considering
> latching onto the HSC40, but am vacillating on the drives...
You have to really *want* one of these. They are power
hungry little beasties.
> they _are_ heavy, and the dealer has no disk packs unless,
> god forbid, they are still in the drives 8-( ... I need to go
> back sometime this week and open 'em up for a look-see.
>
> Not being familiar with the RA60, and being unable to find any
> docs on-line, I have no idea how to open these up... does anyone
> have any experience with these critters? Can they
> be opened without power (i.e. is the top door locked with a
> solenoid?)
As far as what to look for, hold the pack so that light
is passing through the side of it. Every surface should be completely smooth. If you see any rings, it's had the head
touch it. The heads should be white to yellowish white with a dark bar in the middle. If there are black or brown smudges on the head, they've been crashed. If they clean up smooth with 95% alcohol, they ~may~ be okay. I'd have to look, but I think good heads ohmed out at 4-6 ohms. (It's been a while since I last worked on one.)
Dale the DECdude