Dear DG-Addicts,
I am running RDOS (within simh) and I can readily compile
and run Algol programs in this environment. Now want to
compile Algol programs to be loaded stand-alone onto a
8k store machine via paper tape. To do this, a library
called SOS.LB is needed (at least the linker complains, that
it is missing) and so the question is whether some one
out there has already compiled stand alone programs
using RDOS and probably has the SOS.LB for Algol, and
eventually further files required, available?
I already tried to get in touch with people involved in
these web sites
http://www.chookfest.net/nova3/paper-tapes.htmlhttp://www.ludd.luth.se/~ragge/nova/swdocs.html
but so far I have not got hands on the Algol stand alone
stuff. BTW: I do NOT want to use the stand-alone tool
chain, but generate the programs using the RDOS (because
this is more convenient). Any hints are welcome,
best regards,
Erik.
I acquired an Apple IIe at the dump the other day (and a pair of IIgs
machines, sans keyboards/mice - more on those later, probably).
Something heavy has been dropped on the keyboard - there's no damage to the
keytops (amazingly), but the keyboard PCB is cracked and the frame mounting
points bent, and in testing switches around the damaged area I've found
that the '=' key is permanently shorted (I assume it took the brunt of the
impact from whatever-it-was, unless the switches in these machines are
prone to decay and subsequent shorting).
Anyway, is it just a case of desoldering the switch and prying it out of
the metal frame, or is there more to it than that? I did try a little
careful coaxing and it didn't want to move, but I don't want to try more
force if it's the wrong approach.
cheers
Jules
I'm in the process of trying to resurrect a MicroVAX-II system.
I have a RRD50 cd reader and the associated KRQ50 controller. What I'm
missing is the cable between the cabinet kit and the drive.
I've tried various incantations, including a AUI cable (DA15 to DA15)
and what I think is a straight-through cable. I also hooked the cabinet
kit DA15M direct to the drive with no success.
In most cases the drive spins up but when I try to boot it, the red
error LED on the drive blinks then it spins down.
So, I've got to build a cable. Does anyone have documentation of the
pinout of what I need to build?
Thanks,
-Rick
All;
I'm curious as to what other manufacturers/systems supported the use of
block-oriented magnetic tape media along the lines of the DECtape (TU56)
and DECassette (TU60) drives.
In particular, what about the use of standard 1/2" tape media under such
circumstances? A wear-n-tear problem given the multi-pass nature of this
use (especially if being used to store temp-files for the OS), but if that
scenario were avoided ...
I'd like to play around with some, but acquiring either a DECtape or
DECassette unit looks to be somewhere between impossible and merely
seriously unaffordable -- not to mention obtaining media for use with
either. So I'm thinking about whether there are possibly other drives out
there for which I might construct a suitable controller to mediate between
the raw(er) mechanism and the OS.
Unlike a streaming tape unit I'd expect that a major consideration would be
keeping the moment-of-inertia of the reels as low as possible, consistent
with holding a sufficiently long tape at sufficient bit-density to achieve
an economically-viable amount of storage per tape (*e.g*., 256Kb --
DECtape was 184K 12-bit words or 144K 18-bit words).
DEC managed it; did anyone else?
(Of course, if anyone has a lead on a DEC unit -- DECtape preferred -- I'm
very interested.)
Thanks for your thoughts!
-----
paul
As mentioned in my post about IIe keyswitches, I acquired a couple of IIgs
machines at the same time as the IIe (along with an AppleColor RGB monitor)
- but no ADB keyboards or mice.
I've just checked over both systems; one has an Apple memory expansion
board fitted (2MB, I think) and the other has a Harris GS Sauce memory
expansion board (also 2MB via a pair of 1MB simms) and what I think is an
Apple SCSI board (nifty!).
Both seem to power up OK and sit there trying to boot from non-existent
media (display via composite; I don't know if the CRT monitor works - it's
on the to-do list to make a cable).
Anyway, the machine with the SCSI card looks to be an earlier board, and
has a keyboard socket soldered to the PCB. Wikipedia seems to suggest that
this should accept the keyboard from my IIe, albeit with reduced
functionality over a genuine ADB keyboard - however, is it as simple as
plugging it in, or are there other tweaks that are necessary for it to
work? (e.g. perhaps worst-case a ROM change for a ROM that I don't have!).
Although I'd like to get an ADB keyboard and rodent, I'm curious to see if
the IIe keyboard will work in the meantime...
cheers
Jules
I have a broken SGI Indigo I'd like to fix, but I have no idea where to start.
The most obvious problem is that shortly after power on - two seconds, maybe
three - a noise starts coming from the internal speaker. The sound becomes
louder and louder with every second. No startup chime, no output on serial
console.
My initial thought was a broken power supply, but a PSU repair guy I've found
claims that power supply is ok and voltages are correct and clean. He also
says that he tried to bend the "mainboard" - probably the CPU board - slightly
and this sometimes leads to the startup chime.
Any suggestions are welcome. Thanks :-)
--
If you cut off my head, what would I say? Me and my head, or me and my body?
Anyone have a listing of shows coming up in the NY/NJ/CT area...
Anything for computers and/or videogames...
I would like to see about getting a vendor table to sell copies of the
Atari Inc. book and to also sell my USB joysticks and my newer versions
that are ready May 1st.
Thanks.
Curt
https://twitter.com/computermuseum/status/327461803061817345/photo/1
@computermuseum
(Computing History)
3m ago
If my car travelled back to the seventies it would be the most
powerful car on the road!! :-) pic.twitter.com/P2476JP6BC
(Pic shows a car boot containing a PDP - I can't read the model number
- and an Imsai 8080.)
--
Liam Proven ? Profile: http://lproven.livejournal.com/profile
Email: lproven at cix.co.uk ? GMail/G+/Twitter/Flickr/Facebook: lproven
MSN: lproven at hotmail.com ? Skype/AIM/Yahoo/LinkedIn: liamproven
Tel: +44 20-8685-0498 ? Cell: +44 7939-087884
At 10:03 AM 4/30/2013, Glen Slick wrote:
>On Tue, Apr 30, 2013 at 6:02 AM, Cindy Croxton Electronics Plus >
> > These companies have this exact cable listed, Bobby at IGS is the least
> > expensive.
>
>I have bought DEC cables from IGS within the last couple of months and
>was satisfied with the transactions.
Thanks. Given Tony's info, I'll probably try making my own cable as the
prices I can find are high enough that it's worth my time to make my
own surrogate. I've got plenty of DA15 cables used for T1 work that I
can repurpose.
-Rick
Wow! Got a Mac Color Classic for $25! :oD And I made it work :oD
Now I have a computer for that //e card :o)
But it is slow, unbelieveable slow. Is there a way to speed it up without changing the main board? Can I overclock it? I already maxed the memory (but have no VRAM SIMM module) and no FPU, but 16MHz is too slow :(
A 575 board would be great, but seems it has a premium price nowadays
A little of history:
Got this Color Classic and of course, no boot. Took off the motherboard and there was the classic signals of old computers from 90's: Dead PRAM battery, lots of leaked capacitors, tons of dirt. Cleaned the board, changed the capacitors, cleaned the goop with MEK, put a CR2032 with a socket to work as a PRAM battery replacement (these aren't easy to find here in Brazil) and it booted. No "bong", no sound. But it booted properly and loaded system 7.*.*,
On shutdown, it BANGed something, and the classic smell of rotten capacitors was felt on the room. I disassembled the computer and wasn't able to find anything. Now the computer wouldn't boot, but no HD. Without the motherboard, the HD would spin up and thereafter, spin down.
After disassembling the entire computer, I found the hard disk (!) with 4 leaked capacitors. I changed the capacitors and it still wouldn't boot, turning down the HD after some seconds. I changed the HD to another SCSI I had here from my HP16505A and it wouldn't spin down. HD problem.
A more detailed exam shown capacitor goop on the HD digital board. I cleaned it with MEK and it is working properly.
Unfortunately, I'm still unable to make it bong. No sound whatsoever. I tried to use an earphone on the audio output, but got no sound. Changed all the polarized caps on the motherboard (even tantalum ones) and no cigar. I still cannot figure what can be wrong. The audio amplifier SEEMS to be working.
Interesting point: It bonged ONCE.
Tips, suggestions, hints, are welcome :o)
Greetings from Brazil,
Alexandre Souza
---
Enviado do meu Motorola PT550
Meu site: http://www.tabalabs.com.br
