Got a bunch of classic computing junk up for sale, here it is:
DEC RL02 Disk drive x2 - $150 ea
RLV12 controller and cable - $30 with drive purchase only
H9644 chassis with side panels and back door, and trim pieces for RA82 setup
- free for local pickup
DQ130 Pertec disk controller - free with purchase, no cabkit
DEQNA adapter, unknown revision - $10, no cabkit
BA11-SE expansion chassis with cover and expander card in it - $75, clean
unblemished faceplate.
Rack mount SCSI expansion chassis, with partial side rails, $60, very nice
piece
See something you like, make me an offer. These are asking prices
Hello everyone!
I was just investigating the usage of DECDLD for defining a small graphic
screen on my PDP11 during a program.
When using a VT220 at 19200 baud, how fast can a screen be refreshed using
DECDLD graphics? I was thinking of doing a multiplayer (4 player) game
using this system.
Re: "I reckon that a good 35mm camera (good meaning a top-end lens and
fine grain film) is equivalent to 12-20 megapixels."
My understanding from the camera companies, which I've heard more than once
(and going back to 2000, before any such digital cameras existed) is that
they consider 35mm film about the equivalent of 6 megapixels. It's not
exact, as it depends on what image sensor (not all image sensors of the same
megapixels are the same) and what film (not all 35mm films are the same,
either). The lens obviously enters into overall image quality in a big way,
but that is equally true for both film and digital cameras. But bottom
line, as a rule-of-thumb, and other things (in particular the lens) being
equal or at least comparable, I consider (and a lot of experts consider)
that about a 6 megapixel camera is the equivalent of 35mm film.
Can anyone shed any light on this? Box of 8" soft-sectored floppies,
box labelled "Advent Systems LTD.".
Floppies inside:
Paint (2 disks)
POS G601
Advent users
Rectify
Utilities
Doclayout
Docdraw
Designer
Skan
Image compression
Manual fonts
Roman fonts
Rockwell fonts
Megaron fonts
Map rectify
I suspect they might be PERQ disks due to the mention of POS and the
fact that there are PERQs on the site where I got them. It'd be nice to
confirm that though - googling for anything related to Advent turns up
all sorts, and as there are a million and one other flavours of machine
on the same site there's no guarantee they're anything to do with PERQs
at all.
cheers
Jules
Hi all,
A local second-hand store got a bunch of TTL and CMOS chips, maybe
500 pieces in all. It's kind of odd -- some are in original retail
bags, some are in old glass medicine bottles with corks. Someone's
basement workshop collection, I guess.
I looked through them, wrote down some numbers. They're selling them
for about $3 per dozen for the ones in larger quantities.
Anyone interested in MM5262 2K dynamic RAMs? Loads of
these, in original retail plastic bags (antistatic? I think not).
These are interesting, I'm going to pick these up for projects:
8642 quad bus tranceiver?
8836 single-ended bus receiver (Unibus?)
8838 quad bus tranceiver (Unibus?)
MM5311 digital clock
5371 digital clock, 4 digits, 50 Hz
5781 programmable controller or calculator?
MM5780 (2 digit toy calculator?)
MM5799 4-bit microcontroller
5841 serial shift input, 8 bit NPN drivers (50V, 500 MA)
(if this is really what they are, they're really fun)
Anyone have any info on the M5799?
These look like TTL. Anything of special interest in this list?
8092 dual 5-input NAND w/2 inv. inputs
8094 non-inv function buffer gate (if National, DM)
8136 6-bit identity comparator
8601 single RC timer?
8664 7 segment decoder/driver
8796 General purpose Mask Prog ROM (no idea what version)
8806 4-input AND function gate? (if SE/SL/NE)
8828 Dual D flipflop?
8856 programmable counter
8880 Hi volt 7 seg decod/driv
74174 Hex D FF
74181 TTL ALU function generator
Others, can not determine what they are. Any ideas? I can go back and
try to get manufacturer letters:
5737 ???
5782 ???
7504 ???
7506 ???
7515 ???
7517 ???
8096 ???
8098 ???
8670 ???
8681 ???
8817 ???
16254 ???
60769 ???
141097 national semi, no idea
These seem pretty common, not worth bothering with:
4016 CMOS quad bilateral switch
4019 CMOS quad 2-input mux
4021 CMOS 8-bit shift reg
4049 CMOS hex inv buffer
4066 CMOS quad bilateral switch
MM5221 mask prog. ROM (no idea what's on them)
Brian
Scott Stevens <chenmel at earthlink.net> wrote:
> ard at p850ug1.demon.co.uk (Tony Duell) wrote:
> > You do realise I paid less than that for my monorail camera. The
> > [...]
> You can buy a 4x5 'digital back' for that camera.
> [...]
> You'd also be dealing with 450MB images for each shot.
EXACTLY! That is what Tony has been saying all along.
You can't get good quality pictures with digital cameras UNLESS you
want to spend a fortune for the equipment AND deal with the huge
data files.
By contrast film combines very high resolution, compact physical
dimensions, low cost, AND long life. If you add that you do not
require any additional complex supporting equipment to VIEW the
images [1] then you must agree that film is the best medium
for images you want to enjoy for a long time.
Having said that, I do not use film because I prefer the convenience of
digital photographs. But I understand the tradeoffs and do not go about
telling people that my equipment is better than film or that I
produce images that can compete with film.
**vp
[1] compare this with the CDROM or DVD drive that you will need to
read the data, plus an understanding of the encoding/format of the
directory structure on the disk and finally the encoding used for the
images. Before you say smth about jpg, note that for high quality
pictures you would want to keep them in their native (proprietary)
raw format. Given the hell that people are having to go through to recover
data from old media, there is no doubt in my mind that people will
NOT be able to view the digital images they take today, unless they
are willing to devote a lot of effort to preserve them by migrating
them to new storage and encoding technologies as these are introduced.
BTW what are you doing to preserve your VHS tapes? Remember VHS equipment
are disappearing fast from the retail market and, in any case, the ones
made today will not last for more than a couple of years anyway.
Joe, (I think) was asking about power for the Diablo Model 30 disk drive
(DEC RK02/RK03).
I had a chance to look in the manuals on bitsavers today. The Model 30
Maintenance Manual (not the parts list), gives the pinout of the power
connector. I'd forgotten one detail, there are 2 connections for each of
the +15V and =15V lines, one for the high-current, noisy, stuff (like
motors), one for the low currnet, sensitive, stuff like the read
amplifier. You should use separate wires for each connection and only
join them at the PSU output terminals.
There's also a maximum length of power cable, something like 5'. I don't
see why this would be a major problem in any sane system layout.
Oh yes, these drives take up to 8A (!) on the +/-15V lines.
The PSU manual _is_ on bitsavers, I think. It's the Model 29 manual in
the samre directory. No, this is not obvious, I was just looking at
various manuals. The DEC PSU is, I think, electrcially different, though.
-tony
Hello everyone!
I was just investigating the usage of DECDLD for defining a small
graphic screen on my PDP11 during a program.
When using a VT220 at 19200 baud, how fast can a screen be refreshed
using DECDLD graphics? I was thinking of doing a multiplayer (4 player)
game using this system.
Hi
The only issue here is that it also depends on the
camera lens. I have a small lens Olympus C50 with 5 MegPix
and a 10D Canon. There is no question about which
has the sharper pictures. The 10D can be blown up
2 to 2.5 times bigger. So pixel count is not 5.0
vers 6.3.
Dwight
>From: "Barry Watzman" <Watzman at neo.rr.com>
>
>Re: "I reckon that a good 35mm camera (good meaning a top-end lens and
>fine grain film) is equivalent to 12-20 megapixels."
>
>My understanding from the camera companies, which I've heard more than once
>(and going back to 2000, before any such digital cameras existed) is that
>they consider 35mm film about the equivalent of 6 megapixels. It's not
>exact, as it depends on what image sensor (not all image sensors of the same
>megapixels are the same) and what film (not all 35mm films are the same,
>either). The lens obviously enters into overall image quality in a big way,
>but that is equally true for both film and digital cameras. But bottom
>line, as a rule-of-thumb, and other things (in particular the lens) being
>equal or at least comparable, I consider (and a lot of experts consider)
>that about a 6 megapixel camera is the equivalent of 35mm film.
>
>
>
>
