Does anyone out there have a spare 1/2 high 5 1/4" Seagate MFM hard
drive face plate (ST-221, ST-251, etc.) that they can let go cheap?
And also a 34 conductor dual drive cable and a single 20 on single drive
cable?
Thank you.
Contact me off list at bitwiz(a)12bitsbest.com
As we're emigrating soon, I am starting so find a new home for my collection of vintage computers and peripherals. On offer today is:
Dec PDP 8E* ==========on a standA list of modules included in the link below. including with the machine comes: - Rail mounting hardware - Spare power supply - A long flat cable - Bootstrap card M847E - 32k SRAM + Bootstrap card from Vincent Slyngstad (new kit, unassembled)
ASR33 Teletype* ==============on its original stand
Hazeltine H2000 terminal* ========================in pristine condition on a stand
Hazeltine H2000 terminal========================probably not working (got somehow damaged during transport from last seller to me, and I never got around checking out what's wrong)
Tektronix 4014-1* Graphics Terminal ===================================on its original stand
Please make an offer for either some or for all of the items (to martin(a)meiner.ch).
*) Items marked with a star were functioning well a few years ago when I was actively acquiring them. As times went by, it could be that one or the other may need TLC. I have not tested them again for full functionality.
Items are located near Zurich/Switzerland. It is the buyer's responsibility to either pick the items up or to arrange packing and shipping by a forwarder.
Here a link to cloud storage showing photos and other information of the units: http://e.pc.cd/o3sy6alK
More equipment to follow in a few weeks / months (will rather be elder calculators).
It seems that nowadays you can't get *any* replacement for failing DEC
3639 aka 2N3639 transistors. All parts are obsolete and unobtanium, e.g.
2N3640, PN3640, MMBT3640 and so on.
So, what can be used instead? The most important electrical parameter is
the storage time. It needs to be *very* low, around 20-30 ns.
Does it mean that a failing PDP-8 will stay a dead PDP-8 from now on?
Christian
I have an ST-251 42MB MFM hard disk drive.
The documentation says the drive is 512 bytes per sector. I don't know
if this is fixed (hard sectored) or not.
My problem is my operating system (OS/9 Level II) wants 256 bytes per
sector. The OMTI 20C-1 controller can handle that but I'm not sure if
the ST-251 can.
Does anyone know if the ST-251 can support 256 bytes per sector and/or
how to configure it for 256 bytes per sector?
Thank you,
Mike
I'm looking for ancient versions of the VAX Workstation Software (VWS) for
my software collection and for my VAXstation I:
- V1.0
- V1.1
- V2.0
- V3.0
V1.0 (which was called "uVMS VAXstation I graphics/windowing softwarere"
back then) and V1.1 are the most wanted ones, because they are the only
ones that run on MicroVMS V4.0 for the VAXstation I.
Version 1.0 was shipped on two RX50s, labeled “VSI010 1/2” and “VSI010
2/2”; later versions grew bigger and from V2.0 onwards TK50s were used
besides RX50 floppies as well.
Best Regards,
Ulli
40 years ago this year Intel came out with the 80386 – 386 – or i386.
Either seems to be correct. What this meant was a memory address of 4GB,
far beyond what an average computer user would need or want, but was so
much more than previously(8086, 80286); ‘true’ multi-tasking which for the
average computer user didn’t mean all that much; and paging, which made
virtualization possible- experimenters were over-joyed! What all this
contributed to was the end of the classical/vintage-computing era. Whether
this began the time of open-source OS development is debatable!
Happy computing?
Murray 🙂
Via one of the articles about that Unix V4 tape I found this https://eylenburg.github.io/os_familytree.htm which is quite an impressive chart of operating systems old and new.
A few bits are clearly incorrect or missing; for example, P/OS and TRAX are both not there. I was going to mention them to the author of that chart but I don't actually know the correct placement. (Is P/OS an RSX-11/M or M+ derivative? I should know but don't.)
Neat to see RSX-15 mentioned as the ancestor of RSX-11/D. Did the earlier RSX-11 versions ever ship? I know I have seen traces of /A and/or /C...
The DOS-11 and RSTS entries aren't quite right either, I can send feedback for those.
Also, while VMS is reasonably listed as RSX-11/M derivative, I always thought that VAXElan was unrelated. Along the same lines, where would MicroPower/Pascal fit?
paul
