>From: "Bill Pechter" <pechter at gmail.com>
>
>I believe that you can get by with a fairly wide range of diodes and
>caps if you just readjust the video after throwing the cap and diode in.
>
>If I remember correctly the diode was 50v -- and should be at least 100
>as you say.
>
---snip---
Hi
Just as a rule of thumb, the diode needs to be rated
at least 2 times the output voltage for an AC input.
This is not overrating! It actually needs to stand
off that much reverse voltage.
Some pulsed AC supplies, such as switchers may not
need that high of a voltage because the voltage
is not symmetric, on both polarity swings.
If you want to overrate the diode, go to 3 to 4
times the voltage out. 2 times is not overrating,
that is the normal operation level.
Dwight
>
>Subject: Re: FPGA VAX update
> From: Scott Stevens <chenmel at earthlink.net>
> Date: Wed, 02 Nov 2005 18:16:11 -0500
> To: "General Discussion: On-Topic and Off-Topic Posts" <cctalk at classiccmp.org>
>
>> However the most interesting is the Block 1 AGC (apollo guidence computer).
>>
>
>Depending on how much 'from scratch' people feel is necessary, it's also interesting to roll your own computer using an off-the-shelf processor (or multiples). I have a simple 8088-based SBC design wired up and waiting for motivation to put together some test firmware. The main thing that has kept me from bringing it up is the difficulty in getting x86-based machine language development tools going. I'm used to little 4 and 8-bit assemblers where you can plop down a few ORG statements and have it all resident in a ROM, and almost all the x86 asm tools start from the assumption you are running on DOS and have no direct control of the memory map.
>
>Z80 designs are also fun and easy. And I still have those tubes of 6100 processors. . .
I have z80s, 8085s, 6100s and 6120s, 1802s, T11s(PDP-11), 9900s, 6800s, 6809s,
804x, 805x to name a few to play with. I tend to zero in on Z80, 1802, 6100
and 8039(8048) as being interesting. Each of those has some aspect of computing
that it handles elegantly and other parts that are plain dirty.
>Certainly using a micro is by no means as cool as making your own machine
>from small and medium-scale logic, though. I think it would be neat to
>build one using discrete transistors. Not as difficult as a valve-based
>design, but just as deep into the circuitry.
It is. Often it's really just trying to understand the genie with 40 pins.
For me it was started by my contact with the PDP-8I. It just seemed so
buildable. While I've not built one of TTL other have. So I've done 4bitters
and 8 bitter in TTL and one day I'd like to try something bigger.
Valves are harder due to power, heat and most importantly size. A few hundred
miniature duo-triodes will fill several racks.
Allison
Still working with the IRIS- the power supply seems to be working now (replaced 4 paper capacitors with polyester film), low ripple so I think I'm going to risk firing up the computer. On to the Cipher tape drive with a damaged drive roller (the goo problem).
I'd like to get the original drive working eventually, but for now I want to make sure I can back up the disks (if the stickers are to be believed, it has GL2-W 2.2 on one). The tape controller is the standard Multibus Data Systems Design integrated ST-506/floppy/QIC-02 controller, and I don't have much experience with QIC-02. I have Wangtek 1/2 ht QIC-24 and QIC- 150 drives, and the manual for the -24. Is it likely that one or the other will work with the DSD controller? What jumpers would I need to look at? Is there a better way to backup this machine (don't have any other ST-506 interfaces). I want to be able to do a backup first thing.
All
I have three SCSI 9-track tape drives that I'd like to make available
for free.
They're 6250/1600/800 capable, rackmountable ( but I don't have the
slides ), and all three I believe are working. I last used one of
them about 3 years ago. They are "front loaders" about 1 foot high,
about 36 inches deep... the tapes autothread and mount up, but it's
handy to be able to get to the top of the entire unit just in case
the autothreading feature doesn't quite work. SCSI interface uses
50pin Centronics connectors. These drives worked well on SGI and SUN
machines, I've never tried one on anything else.
In any event they're located in Tucson, AZ, and are yours for the
taking... I have no idea how much it would cost to ship these
fellows, they're pretty heavy.
Mike
>
>Subject: QIC-02 on IRIS questions
> From: compoobah at valleyimplants.com
> Date: Fri, 11 Nov 2005 15:48:36 -0600
> To: <cctalk at classiccmp.org>
>
>Still working with the IRIS- the power supply seems to be working now (replaced 4 paper capacitors with polyester film), low ripple so I think I'm going to risk firing up the computer. On to the Cipher tape drive with a damaged drive roller (the goo problem).=0D=0A I'd like to get the original drive working eventually, but for now I want to make sure I can back up the disks (if the stickers are to be believed, it has GL2-W 2.2 on one). The tape controller is the standard Multibus Data Systems Design integrated ST-506/floppy/QIC-02 controller, and I don't have much experience with QIC-02. I have Wangtek 1/2 ht QIC-24 and QIC- 150 drives, and the manual for the -24.. Is it likely that one or the other will work with the DSD controller? What jumpers would I need to look at? Is there a better way to backup this machine (don't have any other ST-506 interfaces). I want to be able to do a backup first thing.=0D=0A=0D=0A
Why not srape off the goo and slide (force) some thick wall vinyl tubing
over the new clean hub? I've done this with TU58s and PC QIC drives.
FYI: the real trick is after you get it on the hub it needs to be trimmed
to the right width.
Allison
On 11/11/05, Zane H. Healy <healyzh at aracnet.com> wrote:
> My point would be that you're more likely to have that DECstation on
> a network than someone is likely to have their PDP-11 running V6 Unix.
Nah. I won't put it on the net. I just want to feel/experience the
native OS which this machine came with. That's all.
>
> Besides, I have no desire to run old versions of Unix, I'd just as
> soon run a supported version (almost said new version, but I still
> use Solaris 8). Also, I don't run Unix on my PDP-11's, as there are
> plenty of interesting OS's that won't run on anything else.
Absolutely. I agree with you 100%.
Running Unix on PDPs would be so..anti-climax..
Hi everyone on this list!
My name is Dimitri Kokken and I live in Brussels, Belgium. I am the owner of an indoor go-kart centre and I am (was?) a passionate collector of home computers.
But...I decided to sell them all. Of course, I was looking for a way to "promote" the sale of my entire old home-computer collection, over 570 different ones, and one of the largest HOME-COMPUTER collections in the world (there are indeed larger COMPUTER collections, but not like this one I think). Anyway...while searching the net I found out about this mailing list and decided to "enlist" :)
About the sale of my collection...I thought it all over very carefully if I was going to do it or not, but there are more reasons I can think of to do it, than not. Some of the most important ones are :
* The passion I had collecting old home computers has kind of "faded away"...and when the passion's gone...
* I am now the proud father (since 15 months) of a daughter and our second saw the light of day a week ago and almost all of my spare time is spent playing with her (and once nr. 2 is old enough : them)...those with kids will understand what I mean.
* We (my wife and I) started building a house and that always costs a lot of money...so, if I can earn some extra with this sale that's nice, it's a bonus so to speak (sale or no sale, we have the funds to build the house, it's just nice to have "more than you need" for unforeseen circumstances, which occur quite often apparently when building)
* I also am the owner of an indoor go-kart centre and that also takes a lot of time...business is going very well, thus : more work (no, I'm not complaining). If you're a buyer and want to pick up the computers here in Brussels a free kart-ride is (of course) included.
How am I selling this lot?
Well...of course I thought about Ebay, but I just don't like to pay that many fees (who does?) Then I got the (very kind) offer from the webmaster of MO5.COM to make an auction site "? la" Ebay...he did this in a record time (3 days or so).
So now I have all 530+ comps (40+ were sold in one lot to a bidder) on sale at www.mo5.com/dimitrisales/ and some 140 people are already placing bids on the comps. The auctions will all end on Sunday the 4th of december, giving everyone plenty of time to bid and think about how much they're willing to spend on their "fave" computer.
There are some real "gems" in the collection, the one which received the highest bid untill now (and probably till the end) is the ORIGINAL GOLDEN C64 WITH COMMEMORATIVE PLAQUE!!! But that's just one of the many nice comps. up for grabs I'd say...it all depends on what you fancy, are you a CBM freak, an Atari lover or....???
If you want to see some pics of the collection you can go here : http://users.pandora.be/F-242/Computers/NewPics-25-10-05/http://users.pandora.be/F-242/Computers/Computer-List-Dimitri-with-picture-… or http://users.pandora.be/F-242/Computers/Computer-List-Dimitri-with-picture-… contain the entire list of my collection, direct links to many of the comps can be found there as well.
Well, that's about it...I have made a FAQ on how to bid/pay/get the comps and also lots of other questions are answered in there as well. This FAQ can be found at the www.mo5.com/dimitrisales/ site.
So, if you're curious about all this, or (even better for me) are looking for something in particular, go and check it out, you won't regret it.
Kind regards,
Dimitri Kokken
in Columbia, Maryland. Running Windows 3.1. Like new with original
box, etc. If interested, email me and I'll give you the guy's phone
number.
Bill Sudbrink
