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Digital PDP-8 DECUS Music Papertapesby billdeg Total messages in this thread: 1  decus papertapes from 1969 would likely have been written for the a PDP-8i. This is not the same as the RF music program demoed elsewhere on this web site. Click on image for larger view.
TAPE LABELS:
8-152a 8 Music Coding Program Symbolic #1
8-152 8 Music Coding Program Symbolic #2
8-152 Teddy Bear's Picnic Symbolic
8-152a Penny Lane Symbolic
8-152 Joy to the World Symbolic
8-152 Your Mother Should Know Symbolic
8-152a Penny Lane 0037-7720, 0170=7777
0171=7777, 0172=7750,
0173=6020 Binary
8-152 When I'm 64
0037=720, 0170=7776
0172-7750
8-16">... [ read more ]
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MAI Jolt 6502 SBC 1975by billdeg Total messages in this thread: 2 Updated: [ Origin of the name JOLT ] 12/21/2018  The first production 6502-based single board microcomputer - The Jolt pre-dates the MOS KIM and Apple I.
More photos
Byte December 1975 ad
I had mentioned this system in a "past issue" of vintagecomputer.net when I used to make hard-coded pages for this site.
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splicing papertapeby billdeg Total messages in this thread: 1  Teletype ASR 33 Papertape reader. You can feed a piece of papertape into the reader in local mode to print a section of tape.
I have found that the trick to splicing, aside from having correction patches is sometimes to overlap two pieces of tape, not try to get an exact cut in the program. To do this I stick in an S0 line (filler line) on both sides of the splice.
If there is a small tear in a tape that causes the reader to snag, use correction patches. If the rip is too large to patch, you'll have to splice it, just as one would a piece of film. Here are some tips how to do this...
Below is a splice of tape, represented by its data. Each 8-bit character is represented by the holes in the tape one at a time as it's fed into">... [ read more ]
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Digital Rainbow (PC100-B2)by billdeg Total messages in this thread: 8 Updated: [ Monochrome monitor option ] 12/09/2018  This is the Rainbow PC100-B2 I restored from three systems' parts. I used the VR241 display from the previous dead Rainbow PC100-B2's I had been working on and now I finally have a system that works. Click image for larger view.
 This will not do....these VR201's are hard to find without screen rot. Click image for larger view.
I got this message from I Primus who suggested ways to deal with the VR201:
"..The cable to the VR201 is very, very simp">... [ read more ]
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Mac 128K with SAD MAC error 041800by billdeg Total messages in this thread: 6 Updated: [ Bad internal Drive Seek ] 11/29/2018 yes, but what does 041800 mean exactly? which chip or section is bad? http://docs.info.a...tml?artnum=7748 04 = class code = memory test mod 3 1800 = chip identification codes, in binary combination 1000 is bit 12, chip G9 0800 is bit 11, chip G8 Need two 4264 chips, to replace G9 and G8. Thanks Herb.">... [ read more ] |
1968 Hitachi HIDIC 100 Mini Computerby billdeg Total messages in this thread: 2 Updated: [ HIDIC 100 Brochure Scan ] 11/23/2018  The cover of the Hitachi HIDIC 100 Mini Computer brochure. Click image for more photos and a pdf of selected photos, not the full brochure
To do...scan the entire brochure. Anyone have info on this computer? I know of other mini's in the HIDIC line but I never read anything about this one. I believe it's an industrial minicomputer sold only in Japan. I need to find a way to optically scan Japanese or find someone who can read Japanese....stand by.">... [ read more ]
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Godbout Static (RAM) But Not Lostby billdeg Total messages in this thread: 1  Bill Godbout died November 11, 2018 in the "Camp Fire" in Northern California, the worst fire recorded in the history of California. Bill Godbout was an early microcomputer industry pioneer whose company Godbout / Compupro based in the Silicon Valley was known for it's quality products. Godbout started as a surplus electronics parts company that expanded into S-100 bus peripheral card manufacture for MITS Altair and other S-100 systems. Godbout began selling complete S-100 systems in the later 1970's and changed it's name to CompuPro. The CompuPro line of S-100 bus systems were sold well into the mid 1980's. Click image for larger view.
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Rolm Corp 1601 RuggedNova 1970by billdeg Total messages in this thread: 1  Back cover of the Rolm Corporation Model 1601 RuggedNova model minicomputer. Click image for larger view.
Product Brochures and Price List
Received this from Classic CMP
"...One of the more interesting problems we faced at ROLM MSC (as opposed to
the telecom side) was the fact that all hardware was designed to be
tri-service. Salt spray and fungal resistance required that the cases
be sealed with thermal frames to conduct heat to external heat
exchangers, but that created interesting issues when sticking the box on
an aircraft (but was a lifesaver with disk drives, as otherwise flying
heads had a tendency to crash with altitude). The chassis ended up
being quite heavy due to the hammer and drop tests (as others have
noted,">... [ read more ]
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1967, Developments in Computer Firmwareby billdeg Total messages in this thread: 1  Cover Electronics April 17, 1967. Click image to download selected pages in PDF format
Interesting short article that describes the state of computer firmware in 1967, and recent developments. This is the copy of Electronics that would have been sold on the day of my birth.
What other computers are shown in the PDF linked above? PDP 8 and IBM 1710.">... [ read more ]
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BASIS 108by billdeg Total messages in this thread: 3 Updated: [ Experimenting with Video ] 10/16/2018  The West German-made BASIS 108 was an Apple II clone with a Z80 processor and built-in video features. This unit has 128K RAM. Click image for larger view.
System power checked out, clean inside, boots Apple Pascal OS. No obvious restoration needed. After a more thorough check-out, I will explore the monitor program (6502) and attempt to boot CP/M, and Apple II programs in color.
Photos">... [ read more ]
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RIP Microsoft Co-founder Paul Allenby billdeg Total messages in this thread: 1  Paul Allen Microsoft Co-Founder 1953 - 2018 Click image for larger view.
I am sure he never saw it, but I once sold Vulcan Electrics, his computer museum project, my Xerox Star computer many years ago, for his computer museum. It's probably in a shed somewhere or stripped for parts.
http://www.vul...r-paul-allen-dies-at-65">... [ read more ]
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VCF Mid West ECCC 2018by billdeg Total messages in this thread: 1  The opening minutes of the 2018 Vintage Computer Festival slash Emergency Commodore Computer Convention, September 15, 2018. Click image for larger view.
 Z demonstrating his Cactus 6502 computer with front panel. Click image for larger view.
 Can you guess what computer is under the hood of this add-on keyboard? Click image for larger view.
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Radio Shack TRS 80 Model 1 26-1008by billdeg Total messages in this thread: 1  The Radio Shack TRS 80 Model 1 26-1008 to my knowledge never appeared in the Radio Shack catalog and was never officially sold in stores. Obviously a few were made, but how many I do not know. Click image for larger view.
 Given the serial number, at least 38 and probably a hundred or so 26-1008 model number Model 1's were produced. Click image for larger view.
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Loading PDP 11 BASIC Papertapeby billdeg Total messages in this thread: 1  After replacing the reader (again) I was able to load PDP 11 BASIC using my Teletype ASR 33. The computer system is my recently repaired PDP 11/05 S. Pictured is the pile of tape the makes up the BASIC program. It takes about 20-30 minutes or so to load the program. Click image for larger view.
 If everything goes right, immediately after loading the tape the system initiates the BASIC program and displays the initialization prompt, *O. Click image for larger view.
Appendix D - The Bootstrap and Absolute Loaders (step by step how t">... [ read more ]
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