Hi and thanks for reading...
I am on the way to getting a small Q-Bus PDP11 up and running (I used to work on and repair then in the 1980s) and have some boards and a chassis now, but I cannot find any documentation for a couple of less common boards I have got - any help would be greatly appreciated - but I have looked in the usual places...
The main issues are:
Mentec M70 CPU - There are jumpers for serial port config and speed.. I have got a glossy leaflet for it but no jumper info..
GRC MLV11 - two serial lines and 128KB memory, but configured with switches - lots of switches...
Also is anyone has any old Q-Bus parts in the UK (particularly any Baydel parts) that are looking for a good home, I would love to hear from you!
Thanks for reading - any help or info much appreciated!
I'm still looking for a copy of CP/M for the Holmes Engineering VID-80
board for the TRS-80 Model III. A manual would be helpful, as well.
Mike Loewen mloewen(a)cpumagic.scol.pa.us
Old Technology http://q7.neurotica.com/Oldtech/
Wild Hare Computer Systems is pleased to announce the public beta
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mapped Nova 840
mapped Nova 3/D
mapped Nova 4/X
Eclipse Desktop Generation Model 20 and Model 30
TTI/TTO primary console (TeleType) input/output
RTC real-time clock
TTI1/TTO1 secondary console (TeleType) input/output
PTR paper tape reader
PTP paper tape punch
LPT line printer
MTA mag tape unit
DSK fixed-head disks
DKP moving head disks
DEP Desktop Generation disks
DZP popular "Zebra" moving head disks
QTY 4060 "Quad" asynchronous multiplexers
ALM 4255 Asynchronous Line Multiplexers
DOS Novas (first DOS written for Nova)
URDOS RDOS for Novas and Eclipses (in unmapped mode)
MRDOS RDOS for Mapped Nova 840
NRDOS RDOS for Mapped Nova 3/D and Nova 4/X
ZRDOS RDOS for Mapped Eclipses
MP/OS Nova 4
MAC (Macro Assembler)
Interactive COBOL (ICOBOL)
Prior Data General knowledge is beneficial to using the emulator and
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...preserving the Data General legacy: www.NovasAreForever.org
I'm working on cleaning up a bit of battery leakage in a MicroVAX 3100
Model 10 and while it's apart I decided to look inside the PSU (an
It's nice and clean inside with no bulging caps. What it does have is an
X2 capacitor, as shown here: https://photos.app.goo.gl/dpdqJ3tuGfsRDR3Y6.
It doesn't appear to be damaged and I can't see the word "RIFA" on it
anywhere but I can't see two of the sides because of other components
that get in the way.
So does anyone know for sure whether it is a RIFA brand or not, or do I
have to desolder it to be sure?
I have a 5100 and 5106 both with a working tape unit.
But the tape unit in my 5110 is not working, and I believe it is the
read/write head. The REWIND command works, but the MARK command does not
I took the Tape Card from the 5110 and swapped it into the 5106, and the
5106 continued to work (and 5110 then had same result, ERR 3). This tells
me the issue isn't any electronics in the Tape Card electronics (such as
Swapping the electronics card is easy. But I haven't yet tried taking the
read/write head from the 5106 and putting it into 5110's tape unit (they
both use all the same components) -- it's not that difficult, but I don't
really want to put a working 5106 at more risk of becoming non-working.
Hence, that's why I'm asking around first if anyone might happen to have
one of these NORTRONICS or a suitable substitute to try. For example, it
may be the same kind of read/write head used in some reel-to-reel systems
of that era (early/mid 1970s).
The various numbers on the read/write head are as follows:
I have measurements and photos of what I'm looking for at the bottom of
The head is about a 15mm x 20mm, with a 26mm ground extension on one side
A few months ago I contacted Nortronics. They had some stock that was
close, but not this exact pin out (4-pins on one side, 6-pins on the other;
not sure which is read vs write). I think all the ones they had were
I've also tried different brand tapes, DC6150 vs DC600A (which all of them
do work in the 5100, but not the 5110).
Any Apple alumni (Al?) with documentation on AWACS registers? I'm trying to
figure out why the BeOS AWACS sound driver works on some Power Mac 6500s and
TAMs but not others (but works fine on 6400s and everything previously).
Yes, I'm aware that Be considered the 6500 "Unsupported but Compatible" and it
boots fine on my 6500/275 but is totally mute. An instrumented driver in debug
mode yielded little insight. The driver thinks it's initialized everything
correctly and reports no errors. I wonder if there's something about the SRS
sound enhancement that's different on later 6500s/TAMs.
------------------------------------ personal: http://www.cameronkaiser.com/ --
Cameron Kaiser * Floodgap Systems * www.floodgap.com * ckaiser(a)floodgap.com
-- God made the integers; all else is the work of Man. -- Kronecker -----------
Does anyone have a REASONABLY priced source for 6" x 14" anti-static bags
with zip lock tops? I've looked on eBay and Amazon with no luck. I have also
looked online and have only found heat sealable bags. I am not sure if it is
the sizing which the issue or what as other size bags seems to be easy to
I've been reporting on 9-track tape seal failures over at least the past 2 decades here.
I first noticed the problem in the very early 2000's, and thought it was just random onesy-twosy failures, possibly contributed to by ozone in LA region, but over the past 20 years the failures have progressed.
Sometime in the past couple weeks the last of my "soft" 9-track tape seals failed, because there is nothing but broken tape seals left hanging in the Wright-Line rack that had all my "new" aka 3M Blackwatch 703 tapes.
Very very few of the older (I think of them as IBM or 70's/80's style) "hard plastic" tape seals failed.
I've been looking for a video or image that shows what font the original
Datapoint 2200 used.
It's not shown in the manual. There is one vintage image with the office
lady and the DP2200 on the desk- but the font isn't very clear in that.
In any modern video about the DP2200, none of them seem to power it on --
which is certainly understandable. From what I've read, the power supply
of that system is prone to failure. Also, the system is hard-coded to load
from Tape 1 -- which means both the tape drive, and tape media, still needs
to be in good working order (which would be pretty rare after this time).
In "the" DP2200 book, it only briefly mentions that the original tape
software was developed "on an HP system" (without any elaboration that I
could tell on which HP system that was).
Nothing in the manual suggests the original DP2200 could "program itself"
(i.e. no built in machine code monitor -- those TTL chips had one strict
boot up sequence: load from tape 1). If there was a read error or no tape
available, I'm curious if any message showed on the CRT.
So, I was just wondering if there was any known pre-1973 Datapoint 2200's
that are still working? (and/or if any HD video of them powered on and
legible font can be seen) Or any other more current system that we know
for sure used the same font?