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Hand-held Calculators and Computerettes |
Teletype as Program Storage for Kim 1by billdeg Total messages in this thread: 2 Updated: [ 470 ohm resistor ?? ] 08/28/2014 Per http://www.kim-1.com/usrman.htm#F24 I am working to set up my KIM to a teletype (not using rs232) using current loop/papertape old school. I have mine wired up now, but have not actually powered on to test. I have what I think is right, but first I want to do more research.... I think it's: application pin T --> Teletype terminal strip connector 6, "what KIM schematic calls the keyboard" U --> 3 "KIM schematic calls the printer" R --> 7 "KIM keyboard return" S --> 4 "printer return" I am basing this on PDP 11 and PDP 8 documentation where (and this works) "transmitted data -" goes to terminal strip connector 6 "transmitted data +" connects to TS 7 "received data -" to TS 3 "received data +" to TS 4 SO, I guess I am wondering if: "printer" in the KIM docs is the same thing as "received data -" in the DEC pdp docs "keyboard" in KIM docs is the same thing as">... [ read more ] |
Rockwell KIM-1 Rev Dby billdeg Total messages in this thread: 5 Updated: [ Rockwell KIM-1 Rev D Photos ] 08/27/2014  Rockwell, MOS or CBM Kim-1? It's a rev D that should be Commodore, but the brand is obscured by a metal plate. There is no date stamp above the serial number that I have seen in another rev D. Perhaps this is one of the KIM-1's from the transition between MOS and Commodore. Or maybe a Rockwell or other OEM Kim-1. But did Rockwell sell rev D's? The date codes of the chips are mostly early 1977, some late 1976 and the layout is the same as other KIMs that I have seen. Note the serial number is PA2079. This same pattern was used by Commodore in later revisions. PA most likely indicates Norristown, Pennsylvania, USA. Click image for larger view.
Here is another rev D, but it does not look much like mine:
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IBM XT 5160 s/n 5462708(5160)by billdeg Total messages in this thread: 1  A few photos of a nice IBM XT model 5160 with 10mb hard drive, CGA display, and AST Six Pak RAM and utility card. Click image for larger view.
 A view with the top cover removed. All components are original. AST made a fortune selling their add-on cards, which were often purchased to expand the system at a lower cost than IBM's expansion cards. The capacity of this 5160 motherboard was 256K, the Six Pak contributes another 384K plus serial and parallel ports.
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Hackers on Planet Earth HOPE Xby billdeg Total messages in this thread: 2 Updated: [ Hearses and Hand-held Calculators ] 08/01/2014  A small crowd gathers around a display terminal transmitting the Edward Snowden and Daniel Ellsberg panel. Every room in the HOPE X convention was tuned in to this historic discussion. Click image to see larger view.
 The Mid-Atlantic Retro Computing Hobbyists club exhibit, "Apple Computer Timeline". Click image for larger view.
More photos">... [ read more ]
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Teletype Reader Controlby billdeg Total messages in this thread: 8 Updated: [ Teletype Reader Control 4915D ] 07/22/2014  Pictured above is a Teletype Model ASR 33 with the cover removed, from a side view angle just behind the line/local/switch. Note keyboard cams in the upper left. This is a standard/stock configuration. Click image for larger version
 Pictured above is a different Teletype Model ASR 33, this time with a Potter & Brumfield tape reader adapter installed. Click image for larger version.
The second teletype pictured is newer that the first (serial number ~100,000 vs. ~400,000).
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Tektronix 5403 Oscilloscope X-Y Artby billdeg Total messages in this thread: 1 Using a synthesizer to generate sounds that will render shapes and pictures on an oscilloscope in X-Y mode... http://youtu.be/O_EyJIlLbGM Here is how I did it. 1. Set 5A48 (in left bay) to 1 volt per division. Display on, channel one output to AC, mode to channel 1. Plug 10x scope into channel 1 2. Set 5A48 (in middle bay) to 1 volt per division. Display off, channel one output to AC, mode to channel 1. Plug 10x scope into channel 1 3. Set 5B31 (in right bay) sec/div to AMPL. Auto trigger 4. Attach probe connector 1 into the left stereo channel, probe connector 2 into the right stereo channel. Attach the probe ends with alligator clips to the individual segmented ends of a 1/4 in stereo jack cable. The other end of the audio cable would be plugged into the headphone jack of the amplifier unit or mixer. The synthesizer is plugged into the mixer like any musical">... [ read more ] |
Cromemco System 1 12v (U2) Repairby billdeg Total messages in this thread: 4 Updated: [ Repairs Completed ] 06/03/2014  Cromemco System 1 LAS1412 12v regulator in power controller, position U2. The system started to smoke while performing disk operation (directory), so I cut power before damage. I did not see any carbon residue. After a more controlled smoke test I found that I could root to the monitor prompt but I had no more 12V to drives, thus could not boot to a disk. Ordered new part. Not sure if the fault was the regulator or something that caused the regulator to over-work, but I could not find any other electrical fault. Click image for larger view.
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PET 2001-8 Internal Cassette Restorationby billdeg Total messages in this thread: 1  Commodore PET 2001-8 internal cassette drive with cover removed. This photo was taken after two repairs were made. First the original belt was removed and replaced using a donor CN2 cassette. Second I repaired the cable that connects to the motherboard. Click image for larger view.
The Commodore CN2 drive belt can be transplanted into the internal cassette drive. It's easy to remove the belt from a CN2 external cassette. To install into the internal cassette just loosen the ... [ read more ]
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Digital PDP 8 OS/8 Help Filesby billdeg Total messages in this thread: 1 Uploaded the contents of the .HL files from various RK05 disk packs. Chock full of useful info. Each file is unique, but they all share similar text. Enjoy. Dump 1 Dump 2 Dump 3">... [ read more ] |
Apple /// Plus and Microsoft Softcardby billdeg Total messages in this thread: 1  Click on image to see the box with label - Apple Softcard /// System by Microsoft - Adding CP/M capabilities to the Apple ///. Click image for larger view.
 Installation of the card was easy...Find an open slot and boot with an Apple III compatible CP/M disk and go! Regular SOS disks still work just fine. Click image for larger view.
 Here is a closeup of the boot screen. Note t">... [ read more ]
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Zorba for Cross-System CP/M Copy?by billdeg Total messages in this thread: 1  Zorba CP/M boot screen apparently is capable of reading various CP/M system files. Click for larger view.
I created a Zorba boot disk using Dunfield's ImageDisk. Upon boot, I noticed that the Zorba apparently is capable of reading multiple types of CP/M systems' files. When I get the chance I'd like to see what kinds of IBM PC CP/M stuff you can do with a Zorba.">... [ read more ]
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PEEKing Into BASIC (VCF 9 Presentation)by billdeg Total messages in this thread: 1 You can now download a PDF of my lecture from VCF East 9.1. -------------- Notes If you're so inclined, here is a listing of my class notes that go along with the PDF link above. Not all slides have notes/I didn't need them. SLIDE 3: Original scope of the program, has evolved over time to include more hardware interaction. Timesharing BASIC was not designed for hardware interaction. SLIDE 4: This class is intended for those who have been introduced to the BASIC language and want to go further with the language in the “vintage computer” perspective. It is also intended for those who have already learned another older language and need only a brief introduction to what is for them a second or third programming language. SLIDE 6: Constants. BASIC programs are made up of statements that contain keywords, variables, operators,">... [ read more ] |
Digital PDP 11/44by billdeg Total messages in this thread: 1  KD11-Z cards - the main card array. This unit also has an expansion backplane connected to the KD11-Z with a UNIBUS 9302
 Front view of the Digital PDP 11/44
 The orginal 11/44 Module Utilization Chart. My system does not have all of these installed.
Here's a good page that describes the system
http://www.pdp-11.nl/pdp11-44star">... [ read more ]
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Vintage Computer Festival East 9.1by billdeg Total messages in this thread: 1  Mother and child playing a tank game made for the Cromemco Dazzler video card, running on an IMSAI with Cromemco CPU card. Click image for larger view.
 Francois Lanciault (Blainville, QC, Canada) brought his HP-9845 exhibit "Dawn of the Workstation". We also had exhibitors and contributors from Europe, Australia and points between. Click image for larger view.
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