EWeek online magazine has an interesting article called "Top Five Vintage Computers Turn Dust into Dollars" at ...
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Erik S. Klein
ErikSKlein
Apr 2, 2005 7:26 pm
I listed several lesser-known pre-Altair machines such as the Kenbak-1, Mark-8 and Scelbi along with my other suggestions but it's hard to validate pricing on...
590
Steve
alltare
Apr 2, 2005 9:42 pm
Thanks Erik. I should have mentioned that you were one of the people quoted in that article. I suppose any computing or calculating device that's at least as...
591
nickinthecity2000
nickinthecit...
Apr 9, 2005 4:30 am
I got the mainboard for an Altair 680 off ebay, and am trying to collect all the components so i can start the project. Here is the deal though, since this...
592
Steve
alltare
Apr 9, 2005 4:43 am
Nicky, Welcome to the group. Those aren't unusual parts at all. Digikey, Mouser, etc., all have what you need. Using a 2200uf cap might allow too much AC...
593
nickinthecity2000
nickinthecit...
Apr 9, 2005 5:08 am
Thanks for your help, guess i was looking in the wrong places. I was looking at JDR, Jameco, Electronic Goldmine, etc. Nicky ... the ... bridge ... because ......
594
nickinthecity2000
nickinthecit...
Apr 9, 2005 9:40 pm
Would it be possible to replace the 2102 socket on the altair with a 64k ram chip ? (Pin compatible. )...
595
danos_p_y
Apr 11, 2005 4:33 pm
Hi, If there is enough space available you can use two capacitors connected together (parallel, of the same type), e.g. 2200 uF + (1000-1200) uF. The total...
596
UEOGUY-H.E.ROBT
ueoguy
Apr 12, 2005 3:15 am
Hello Nicky, I'm gonna go out on a limb here and say that a 64K RAM chip and pin compatibility with a 2102 (21L02), etc., are more or less mutually exclusive?...
597
nickinthecity2000
nickinthecit...
Apr 12, 2005 3:21 am
ok, cool. Thanks for the reply. I realized this machine is builting + 20 years later when memory is much cheaper. I thought it would be nice to just go on...
598
Craig Landrum
craig_o
Apr 12, 2005 11:12 pm
Has anyone authentically (or semi authentically) repainted their 8800? If so, what kind of paint did you use, what brand, where did you get it? FYI, you can...
599
nickinthecity2000
nickinthecit...
Apr 12, 2005 11:18 pm
lOoking at the schematic i realized the arrangement was actually four 1024 byte rams. therefore it would seem i could use 16k chips to bring the memory to the...
600
Steve
alltare
Apr 12, 2005 11:40 pm
Maybe I'm missing something here, but how will the computer access the larger chips' extra address lines? Is the necessary address decoding and driver...
601
nickinthecity2000
nickinthecit...
Apr 13, 2005 12:36 am
No you are probally correct, this the first time i have ever built a project this big. I am still learning digital electronics....
602
nickinthecity2000
nickinthecit...
Apr 13, 2005 1:00 am
Apparently you can buy a pdp 8 compatible kit, and build a pdp 8 clone from the ground up... (: http://www.sparetimegizmos.com/Hardware/SBC6120-2.htm sigh,...
603
Steve
alltare
Apr 13, 2005 1:57 am
Hey, that's pretty neat. It looks like ~$780 for computer plus front panel. A little too rich for me, but a nice idea. alltare ... clone...
604
UEOGUY-H.E.ROBT
ueoguy
Apr 13, 2005 6:18 am
Nicky, That is a pretty kewl site! I found the link to the ersatz 11 site intriguing as well. I have an old PDP LSI 11/40 front panel and bezel I'd love to...
605
Steve
alltare
Apr 13, 2005 10:55 pm
Tubes? I'll give you tubes! http://home.earthlink.net/~webdisk1/oddtubes/oddtubes.htm alltare ... bezel ... Steve? ... clone ... with our group, there are...
606
nickinthecity2000
nickinthecit...
Apr 15, 2005 7:07 am
Honestly, I don't want all the publicity. Collecting this toys has already become expensive enough, without even more people starting to realize the...
607
nickinthecity2000
nickinthecit...
Apr 15, 2005 7:49 am
Do you know where i can find a 4449 ic? ... the ... bridge ... because ... an ... 50 ... the...
608
UEOGUY-H.E.ROBT
ueoguy
Apr 15, 2005 8:04 am
What was it used for in the circuit? Was it a CMOS chip? ... [Non-text portions of this message have been removed]...
609
nickinthecity2000
nickinthecit...
Apr 16, 2005 2:02 am
I do remeber it being listed somewhere as a cmos chip but i am unsure. As I said in another post, I have never built a project this big. I'll do scan of the...
610
nickinthecity2000
nickinthecit...
Apr 16, 2005 6:07 am
I did a search on digikey and got several type chips for the same number. i'm guessing it is a line driver though. the 680 did have a built in terminal...
611
Dan
ragoo_sauce
Apr 22, 2005 4:08 am
Hello All, Anyone from the Pittsburgh area that's also into vintage computer collecting ? Dan -- ...
612
horacehall
Apr 22, 2005 5:28 pm
Nicky, Got your email & replied, & that reminded me to look into the Group, since I'd not been here in ages. The 4449 is apparently the same as a 4009. My kit...
613
Steve
alltare
Apr 22, 2005 6:17 pm
Wayne- What typr of ROMs/PROMS did SWTPC use for Swatbug? 2708s? steve ... kick...
614
horacehall
Apr 29, 2005 6:49 am
... I don't know Steve. It was a small program, just 1K, on a single chip. A ROM type chip, not UV erasable type chip. No standard part number on it, just the...
615
nickinthecity2000
nickinthecit...
Apr 29, 2005 7:47 am
In the very earliest years of the altair you really couldn't order a serial board kit or buy an ascii keyboard (i could be wrong on the keyboard part). You had...
616
Dan
ragoo_sauce
Apr 29, 2005 11:32 am
No virus found in this outgoing message. Checked by AVG Anti-Virus. Version: 7.0.308 / Virus Database: 266.10.4 - Release Date: 4/27/2005 [Non-text portions of...
617
Craig Landrum
craig_o
Apr 29, 2005 4:11 pm
I have the electronic front panel with switches mounted on it plus the S-100 bus motherboard, but am looking for an empty case with lettered front to put it...
