Is there a schematic for the H7441 regulator anywhere? There are several
out there for the H744 but, although they are plug compatible, the H7441 is
totally different. The H744 uses an LM723, but in the 7441 DEC appears to
have rolled their own regulator using a bunch discrete parts and opamps.
Bob
We use groups,io for the tom swift discussion group real handy to post photos, files and etc..
On Wednesday, June 17, 2020 Chris Hanson via cctalk <cmhanson at eschatologist.net; cctalk at classiccmp.org> wrote:
On Jun 17, 2020, at 1:50 AM, Tor Arntsen via cctalk <cctalk at classiccmp.org> wrote:
>
>>>> There is also groups.io, and it has some very nice features compared to
>
> Please please, no groups of any kinds. They're all horrible to use.
Do you mean "web forum" where you say "groups?"
> A
> genuine mailing list like this is infinitively easier to keep track of
> and read at leisure. Can't stand groups.io.
I've found the groups.io <http://groups.io/> mailing list mode to be perfectly reasonable for a number of groups I'm a part of. And it has a forum-like front end for people who insist on doing everything through a web page.
? -- Chris
Guys,
I have acquired this board and have trouble assigning it to a particular
computer manufacturer and type:
https://lh3.googleusercontent.com/byRPH3wCR2aqxGX9U8BZfFTT_XtF7QCKSyVXoNmGIk
UheiJ5BWqxYaCWdEshppLGYkOqUD7fl9XNeVzO_tDRKVOtbC3Js7T-pOvNUHs9MY9A36fc7dU6ro
1i7hx9Uhcfc6ukEGIdC5Ac6aTQhEFFoeWBxiI6Z24hZdvq1r6vRb4o-Lj778Wbo15hwxu0JxMuxE
tcopNv0FG0_g6nUv0Eofalqu4TmgPfUWVCd4Y4LdA0pnhDRMYF5c2ASzS00TsyukCVrUyr298tjo
vztVzUGEPHNL1beVCriuQIBLITaEMX3N8EBDuxpfav0vHFuyy9yfAgUI4uJB9qT6aFGEk2KplIVt
yNWZf9phTdj-jLtqns9WvdA9Ur2klrk4uPzMyWg6SKTKRlpMrvbJuMnqZodzxPFPvWCG5--kVVBD
KRAXW8xOTOPyxXx0xrcPifO49ni2SFYIkZgTb9d4gzvJaM8ugEb-jqHlc7uqHz5glwe4PfoN838w
zMozr43veZSNHRTm9IMfON-w7xvbVufJpa_MzhuaTlKf9pvVcRIuxfhG4pMeVq7K6phhHpsKPfG5
h4BRgDSimCE8mToI35IWS3Ty8j01-6bibKH_kB-t35aIdkv7JIC-YZ1sDoguSdyk8h1xbM2d9i_U
LFQYVC0oCHESgEGdqzGO3ntgwmV4khjgaQkcp2Bk-TuC7Nwrl57JI=w654-h871-no?authuser=
0
https://lh3.googleusercontent.com/HvltevPwIvyJF0qiAJR6wCAkI4lHfFGL2Gos5uoT4a
qEJNFBAwJ3m6XX8E6k0m515EYgZJMaCwFGXiGiTCkxDeT396EjsbkukK3_XYqNDjfU8o3Pbtdq8z
vm_q7MXShANXVFUL2wjXEbAhvBug1h42tZnxpDaxTCeNIHjqF2bgs6J_S3wCjmx538E4AuHCHxrr
CqIr8yvL7AGlZXCWe8u05YNNZbIrUCYHbTtxh15hc0SwfRPzQ2U2v-pPxHs7-rx5mPpwxovbp24a
CdwLBf5RRvvEZWZgyDGKG8xdF-al4kQdZMgxrVVXFMse3ee_J-QaYgALUxckGeWp2QxM4wolrd8Q
Y1PqaMaTgbws5WSrOeBBBZrhmrUeL4TzZAlCA4-FqtRpoPIA339y9JRixB8Q6LlUeNsWzlqGqkvC
JSCHlh_hpCXgwemhOtF4B1CLvNGs-PSZjTsnj_KOeSgeINz5Sc6TCrHmnxCcIY6D42aKMJRHZ9I9
7Z02FLsKwN6IKLxjifZvrkmEX4L8qXLbd8cuF0uf1PMjwC9WNC1_QpOmMiJOrBloG9pdrHRGvmfR
RPQE7c6_HxVklEpIbxqkLmQVkKF-oM8VYS3A11tvslxiZUcvQcEhuEYhPLoqTD8PDikYhxKyVLhq
S0DC-bIVBDDLeqiegQelHFjhptKwgs-0Q5mMrxvE6rdsd6-ipEf5Q=w654-h871-no?authuser=
0
Smells of (early) 1960s transistorized.
No helpful marking apart from
* "GATE JJ01" on SIDE A. (components).
* "C NT OL DATA" on side B (solder traces).
Big transistors are Motorola "180376008". Also, any ideas what the "246 636
B" boxes are, they have four legs?
Can any of you of mature years suggest anything?
Many thanks,
peter
|| | | | | | | | |
Peter Van Peborgh
62 St Mary's Rise
Writhlington Radstock
Somerset BA3 3PD
UK
01761 439 234
"Our times are in God's wise and loving hands"
|| | | | | | | | |
Not exactly on subject, but problems designing the IBM 604 Electronic Calculating Punch due to the use of existing vacuum tube designs is discussed in section 2.4 of:
Charles J. Bashe, Lyle R. Johnson, John H. Palmer, and Emerson W. Pugh
IBM?s Early Computers
The MIT Press, 1986
The book says Ralph Palmer set up a vacuum tube laboratory with the ability to manufacture small quantities of tubes. This helped them get credibility when they went to a vacuum tube manufacturer with a request for a design change to achieve the needed reliability for digital applications.
Hi!
Anyone else getting duplicate messages from this list? I get 2 copies of
most (but not all) messages, with the second copy often arriving
significantly later.
Julf
Hi all.
I recently bought a mystery blinkenlight panel. Closer inspection reveals it was manufactured by Intel in the early 70?s (1973), and some people on the book of faces suggested it was part of a ?device multiplexer?(?)
I?m 95% confident it?s not strictly a ?computer? blinkenlight panel, but rather an attached device, but that still hasn?t helped me narrow down what exactly it was from.
I?ve not seen any early Intel stuff as rack-mount, so i?m wondering if it was a prototype, or maybe a piece of internal/non-commercial hardware for Intel's own use.
I?m hoping someone here might be able to shed some light on this mystery.
Pictures: https://imgur.com/gallery/lD74oSy <https://imgur.com/gallery/lD74oSy>
Thanks in advance.
Josh Rice
Is there anyone that has already built a tool to dump TU58-tapes on a Linux
machine? I have the drive of course.
There is PUTR. But it is DOS only and is written in assembler so it cannot
be ported easily. The other option is running RT11 on a PDP-11, but then
there is the hassle of getting the dumps off the RT11 file system.
It is probably not too difficult to use relevant parts of the various TU58
Unix implementations out there to do something quickly, but if someone has
already done it, it would be great to not reinvent the wheel.
I have approximately 80 11/730 and 11/750 console and diag tapes that
need reading.
/Mattis
Folks,
I think I now have too many 3174 controllers. I have
1 x Rack Mount - Token Ring Card + MFM Disk Emulator
1 x Large Tabletop - Token Card
1 x Large Tabletop - Ethernet Card <=> I am keeping this.
1 x Small Tabletop - Token Ring card but won't run TCPIP code.
If anyone wants one of these I am happy to ship at cost but they are
220/240v and heavy so shipping to USA may be a problem.
I have a selection of floppy drives that can be fitted but I recommend using
a Gotek with FlashFloppy firmware.
I also have the following spares:-
1. working PSU for rack mount
2. non-working PSU for the rackmount systems but I am sure it can be
fixed
3. spare motherboard for rackmount
4. spare token ring card (if I can find it)
5. (I may have memory modules but can't remember where I put them
6. I think I have a 3299 multiplexor some where
Feel free to e-mail off-list with questions.
Dave Wade
G4UGM & EA7KAE
> With Jay retiring, what are the hosting plans for these mailing lists?
Hi Al,
I didn't know about Jay retiring or what that means for the list - i.e. does it need to find new infrastructure, new administraton/management, or both? I'm a relatively background person in the vintage computing scheme of things but I do have an involvement in the data centre / hosting area & so if no better options were to come forward would be very happy to pitch in somehow.
