#umdpdp12 — Public Fediverse posts
Live and recent posts from across the Fediverse tagged #umdpdp12, aggregated by home.social.
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My student, Zach, got the famous Whetstone floating-point benchmark running in FORTRAN IV on our PDP-12 (results had never been recorded for a '12 without an FPP). He also implemented the Dhrystone integer benchmark in PDP-8 assembly, which (as far as we know) has never been done before. You can read more about it here, and if you have a PDP-8 compatible machine (with or without EAE), you should be able to run his code to benchmark your system! Way to go, Zach! https://forum.vcfed.org/index.php?threads/pdp-8-and-pdp-12-and-dhrystone-and-whetstone.1253367/ #pdp12 #pdp #retrocomputing #umdpdp12 #pdp8
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My student, Zach, got the famous Whetstone floating-point benchmark running in FORTRAN IV on our PDP-12 (results had never been recorded for a '12 without an FPP). He also implemented the Dhrystone integer benchmark in PDP-8 assembly, which (as far as we know) has never been done before. You can read more about it here, and if you have a PDP-8 compatible machine (with or without EAE), you should be able to run his code to benchmark your system! Way to go, Zach! https://forum.vcfed.org/index.php?threads/pdp-8-and-pdp-12-and-dhrystone-and-whetstone.1253367/ #pdp12 #pdp #retrocomputing #umdpdp12 #pdp8
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My student, Zach, got the famous Whetstone floating-point benchmark running in FORTRAN IV on our PDP-12 (results had never been recorded for a '12 without an FPP). He also implemented the Dhrystone integer benchmark in PDP-8 assembly, which (as far as we know) has never been done before. You can read more about it here, and if you have a PDP-8 compatible machine (with or without EAE), you should be able to run his code to benchmark your system! Way to go, Zach! https://forum.vcfed.org/index.php?threads/pdp-8-and-pdp-12-and-dhrystone-and-whetstone.1253367/ #pdp12 #pdp #retrocomputing #umdpdp12 #pdp8
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My student, Zach, got the famous Whetstone floating-point benchmark running in FORTRAN IV on our PDP-12 (results had never been recorded for a '12 without an FPP). He also implemented the Dhrystone integer benchmark in PDP-8 assembly, which (as far as we know) has never been done before. You can read more about it here, and if you have a PDP-8 compatible machine (with or without EAE), you should be able to run his code to benchmark your system! Way to go, Zach! https://forum.vcfed.org/index.php?threads/pdp-8-and-pdp-12-and-dhrystone-and-whetstone.1253367/ #pdp12 #pdp #retrocomputing #umdpdp12 #pdp8
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My student, Zach, got the famous Whetstone floating-point benchmark running in FORTRAN IV on our PDP-12 (results had never been recorded for a '12 without an FPP). He also implemented the Dhrystone integer benchmark in PDP-8 assembly, which (as far as we know) has never been done before. You can read more about it here, and if you have a PDP-8 compatible machine (with or without EAE), you should be able to run his code to benchmark your system! Way to go, Zach! https://forum.vcfed.org/index.php?threads/pdp-8-and-pdp-12-and-dhrystone-and-whetstone.1253367/ #pdp12 #pdp #retrocomputing #umdpdp12 #pdp8
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My student, Zach, has been working to debug why our bottom tape unit has been misbehaving. We are fairly certain that the issue is a short in the interface cable between the top and bottom units, because the problem appears on whatever unit is on the end of the daisy chain. Stay tuned. But in the process of monkeying with it, there was a period of time where they both worked just fine! #dec #pdp12 #pdp #retrocomputing #vintagecomputing #umdpdp12
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My student, Zach, has been working to debug why our bottom tape unit has been misbehaving. We are fairly certain that the issue is a short in the interface cable between the top and bottom units, because the problem appears on whatever unit is on the end of the daisy chain. Stay tuned. But in the process of monkeying with it, there was a period of time where they both worked just fine! #dec #pdp12 #pdp #retrocomputing #vintagecomputing #umdpdp12
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My student, Zach, has been working to debug why our bottom tape unit has been misbehaving. We are fairly certain that the issue is a short in the interface cable between the top and bottom units, because the problem appears on whatever unit is on the end of the daisy chain. Stay tuned. But in the process of monkeying with it, there was a period of time where they both worked just fine! #dec #pdp12 #pdp #retrocomputing #vintagecomputing #umdpdp12
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My student, Zach, has been working to debug why our bottom tape unit has been misbehaving. We are fairly certain that the issue is a short in the interface cable between the top and bottom units, because the problem appears on whatever unit is on the end of the daisy chain. Stay tuned. But in the process of monkeying with it, there was a period of time where they both worked just fine! #dec #pdp12 #pdp #retrocomputing #vintagecomputing #umdpdp12
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My student, Zach, has been working to debug why our bottom tape unit has been misbehaving. We are fairly certain that the issue is a short in the interface cable between the top and bottom units, because the problem appears on whatever unit is on the end of the daisy chain. Stay tuned. But in the process of monkeying with it, there was a period of time where they both worked just fine! #dec #pdp12 #pdp #retrocomputing #vintagecomputing #umdpdp12
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Hi all, we did our annual PDP-12 demo in Dr. Ted Pedersen's architecture class on Tuesday, and it went really well.
In cleaning up / reorganizing after showing off our artifacts, I realized that we have something that I haven't seen on @bitsavers, but I maybe just didn't know where to look. It's a big poster of PDP-12 instructions -- it's kind of like the pocket reference in poster format. It is about 9.5x30 inches (24x76 cm). I scanned it in two pieces on the office machine and stitched it together with GIMP. I'll try to make a PDF version with OCR text. @bitsavers #vintagecomputing #retrocomputing #pdp12 #pdp #dec #umdpdp12
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Hi all, we did our annual PDP-12 demo in Dr. Ted Pedersen's architecture class on Tuesday, and it went really well.
In cleaning up / reorganizing after showing off our artifacts, I realized that we have something that I haven't seen on @bitsavers, but I maybe just didn't know where to look. It's a big poster of PDP-12 instructions -- it's kind of like the pocket reference in poster format. It is about 9.5x30 inches (24x76 cm). I scanned it in two pieces on the office machine and stitched it together with GIMP. I'll try to make a PDF version with OCR text. @bitsavers #vintagecomputing #retrocomputing #pdp12 #pdp #dec #umdpdp12
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Hi all, we did our annual PDP-12 demo in Dr. Ted Pedersen's architecture class on Tuesday, and it went really well.
In cleaning up / reorganizing after showing off our artifacts, I realized that we have something that I haven't seen on @bitsavers, but I maybe just didn't know where to look. It's a big poster of PDP-12 instructions -- it's kind of like the pocket reference in poster format. It is about 9.5x30 inches (24x76 cm). I scanned it in two pieces on the office machine and stitched it together with GIMP. I'll try to make a PDF version with OCR text. @bitsavers #vintagecomputing #retrocomputing #pdp12 #pdp #dec #umdpdp12
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Hi all, we did our annual PDP-12 demo in Dr. Ted Pedersen's architecture class on Tuesday, and it went really well.
In cleaning up / reorganizing after showing off our artifacts, I realized that we have something that I haven't seen on @bitsavers, but I maybe just didn't know where to look. It's a big poster of PDP-12 instructions -- it's kind of like the pocket reference in poster format. It is about 9.5x30 inches (24x76 cm). I scanned it in two pieces on the office machine and stitched it together with GIMP. I'll try to make a PDF version with OCR text. @bitsavers #vintagecomputing #retrocomputing #pdp12 #pdp #dec #umdpdp12
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Hi all, we did our annual PDP-12 demo in Dr. Ted Pedersen's architecture class on Tuesday, and it went really well.
In cleaning up / reorganizing after showing off our artifacts, I realized that we have something that I haven't seen on @bitsavers, but I maybe just didn't know where to look. It's a big poster of PDP-12 instructions -- it's kind of like the pocket reference in poster format. It is about 9.5x30 inches (24x76 cm). I scanned it in two pieces on the office machine and stitched it together with GIMP. I'll try to make a PDF version with OCR text. @bitsavers #vintagecomputing #retrocomputing #pdp12 #pdp #dec #umdpdp12
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Today was PDP-12 demo day! #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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Today was PDP-12 demo day! #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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Today was PDP-12 demo day! #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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Today was PDP-12 demo day! #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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Today was PDP-12 demo day! #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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A TU-55 LINCtape drive from a PDP-12 in action. #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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A TU-55 LINCtape drive from a PDP-12 in action. #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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A TU-55 LINCtape drive from a PDP-12 in action. #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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A TU-55 LINCtape drive from a PDP-12 in action. #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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A TU-55 LINCtape drive from a PDP-12 in action. #vintagecomputing #retrocomputing #pdp #pdp12 #umdpdp12
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From the DEC OS/8 Handbook https://bitsavers.org/pdf/dec/pdp8/os8/OS8_Handbook_Apr1974.pdf (1974). Personally, I think they're really underselling themselves.
#dec #pdp #umdpdp12 #vintagecomputing #retrocomputing #basic
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From the DEC OS/8 Handbook https://bitsavers.org/pdf/dec/pdp8/os8/OS8_Handbook_Apr1974.pdf (1974). Personally, I think they're really underselling themselves.
#dec #pdp #umdpdp12 #vintagecomputing #retrocomputing #basic
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From the DEC OS/8 Handbook https://bitsavers.org/pdf/dec/pdp8/os8/OS8_Handbook_Apr1974.pdf (1974). Personally, I think they're really underselling themselves.
#dec #pdp #umdpdp12 #vintagecomputing #retrocomputing #basic
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From the DEC OS/8 Handbook https://bitsavers.org/pdf/dec/pdp8/os8/OS8_Handbook_Apr1974.pdf (1974). Personally, I think they're really underselling themselves.
#dec #pdp #umdpdp12 #vintagecomputing #retrocomputing #basic
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From the DEC OS/8 Handbook https://bitsavers.org/pdf/dec/pdp8/os8/OS8_Handbook_Apr1974.pdf (1974). Personally, I think they're really underselling themselves.
#dec #pdp #umdpdp12 #vintagecomputing #retrocomputing #basic
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Our PDP-12 (#435) is able to read tapes (but not yet write them). This OS/8 tape is close to 50 years old and still reads well. Here we use the TYPE command to print a long listing stored on multiple tape blocks. LINC and DECtape was able to be used as random access storage (like a disk). The block numbers were written forwards and backwards on the tape so that they could be read regardless of the motor's direction!
In this video, we have a tape mounted on the top drive and have already booted. Zach requests to print the file to the (virtual) teletype, and the blocks of the file are read in sequence.
#umdpdp12 #dec #pdp #pdp12 #retrocomputing #vintagecomputing
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Our PDP-12 (#435) is able to read tapes (but not yet write them). This OS/8 tape is close to 50 years old and still reads well. Here we use the TYPE command to print a long listing stored on multiple tape blocks. LINC and DECtape was able to be used as random access storage (like a disk). The block numbers were written forwards and backwards on the tape so that they could be read regardless of the motor's direction!
In this video, we have a tape mounted on the top drive and have already booted. Zach requests to print the file to the (virtual) teletype, and the blocks of the file are read in sequence.
#umdpdp12 #dec #pdp #pdp12 #retrocomputing #vintagecomputing
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Our PDP-12 (#435) is able to read tapes (but not yet write them). This OS/8 tape is close to 50 years old and still reads well. Here we use the TYPE command to print a long listing stored on multiple tape blocks. LINC and DECtape was able to be used as random access storage (like a disk). The block numbers were written forwards and backwards on the tape so that they could be read regardless of the motor's direction!
In this video, we have a tape mounted on the top drive and have already booted. Zach requests to print the file to the (virtual) teletype, and the blocks of the file are read in sequence.
#umdpdp12 #dec #pdp #pdp12 #retrocomputing #vintagecomputing
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Our PDP-12 (#435) is able to read tapes (but not yet write them). This OS/8 tape is close to 50 years old and still reads well. Here we use the TYPE command to print a long listing stored on multiple tape blocks. LINC and DECtape was able to be used as random access storage (like a disk). The block numbers were written forwards and backwards on the tape so that they could be read regardless of the motor's direction!
In this video, we have a tape mounted on the top drive and have already booted. Zach requests to print the file to the (virtual) teletype, and the blocks of the file are read in sequence.
#umdpdp12 #dec #pdp #pdp12 #retrocomputing #vintagecomputing
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Our PDP-12 (#435) is able to read tapes (but not yet write them). This OS/8 tape is close to 50 years old and still reads well. Here we use the TYPE command to print a long listing stored on multiple tape blocks. LINC and DECtape was able to be used as random access storage (like a disk). The block numbers were written forwards and backwards on the tape so that they could be read regardless of the motor's direction!
In this video, we have a tape mounted on the top drive and have already booted. Zach requests to print the file to the (virtual) teletype, and the blocks of the file are read in sequence.
#umdpdp12 #dec #pdp #pdp12 #retrocomputing #vintagecomputing
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Here's a PDF for the FabriTek Model 8 Add-on Core Memory for the PDP-8 and PDP-12 -- this is the device that Vince's MM8/I memory expansion emulates (or replaces). (Thanks, Bitsavers, as always!) http://www.bitsavers.org/pdf/fabritek/model_8/400-0226-00_Model_8_PDP-8_24kCore_197401.pdf #umdpdp12 #pdp-12 #pdp-8 #pdp #dec #VintageComputing #RetroComputing
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Here's a PDF for the FabriTek Model 8 Add-on Core Memory for the PDP-8 and PDP-12 -- this is the device that Vince's MM8/I memory expansion emulates (or replaces). (Thanks, Bitsavers, as always!) http://www.bitsavers.org/pdf/fabritek/model_8/400-0226-00_Model_8_PDP-8_24kCore_197401.pdf #umdpdp12 #pdp-12 #pdp-8 #pdp #dec #VintageComputing #RetroComputing
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Here's a PDF for the FabriTek Model 8 Add-on Core Memory for the PDP-8 and PDP-12 -- this is the device that Vince's MM8/I memory expansion emulates (or replaces). (Thanks, Bitsavers, as always!) http://www.bitsavers.org/pdf/fabritek/model_8/400-0226-00_Model_8_PDP-8_24kCore_197401.pdf #umdpdp12 #pdp-12 #pdp-8 #pdp #dec #VintageComputing #RetroComputing
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Here's a PDF for the FabriTek Model 8 Add-on Core Memory for the PDP-8 and PDP-12 -- this is the device that Vince's MM8/I memory expansion emulates (or replaces). (Thanks, Bitsavers, as always!) http://www.bitsavers.org/pdf/fabritek/model_8/400-0226-00_Model_8_PDP-8_24kCore_197401.pdf #umdpdp12 #pdp-12 #pdp-8 #pdp #dec #VintageComputing #RetroComputing
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Here's a PDF for the FabriTek Model 8 Add-on Core Memory for the PDP-8 and PDP-12 -- this is the device that Vince's MM8/I memory expansion emulates (or replaces). (Thanks, Bitsavers, as always!) http://www.bitsavers.org/pdf/fabritek/model_8/400-0226-00_Model_8_PDP-8_24kCore_197401.pdf #umdpdp12 #pdp-12 #pdp-8 #pdp #dec #VintageComputing #RetroComputing
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Today, Zach and I got Vince Slyngstad's PDP MM8/I memory expansion installed in our PDP-12! No magic smoke got out, the computer booted, and appears (from console and diagnostic checks) to have 32kW of memory! The PDP-12 only had room for 8 kW inside, but could connect to an external box that would include up to 24kW of additional core. Vince's expansion plugs into the five flip chip slots that would normally lead to the external unit. All memory hardware is on those five cards, with a six card providing an electrical connection. More soon! #umdpdp12 #pdp12 #pdp #dec #RetroComputing #VintageComputing
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Today, Zach and I got Vince Slyngstad's PDP MM8/I memory expansion installed in our PDP-12! No magic smoke got out, the computer booted, and appears (from console and diagnostic checks) to have 32kW of memory! The PDP-12 only had room for 8 kW inside, but could connect to an external box that would include up to 24kW of additional core. Vince's expansion plugs into the five flip chip slots that would normally lead to the external unit. All memory hardware is on those five cards, with a six card providing an electrical connection. More soon! #umdpdp12 #pdp12 #pdp #dec #RetroComputing #VintageComputing
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Today, Zach and I got Vince Slyngstad's PDP MM8/I memory expansion installed in our PDP-12! No magic smoke got out, the computer booted, and appears (from console and diagnostic checks) to have 32kW of memory! The PDP-12 only had room for 8 kW inside, but could connect to an external box that would include up to 24kW of additional core. Vince's expansion plugs into the five flip chip slots that would normally lead to the external unit. All memory hardware is on those five cards, with a six card providing an electrical connection. More soon! #umdpdp12 #pdp12 #pdp #dec #RetroComputing #VintageComputing
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Today, Zach and I got Vince Slyngstad's PDP MM8/I memory expansion installed in our PDP-12! No magic smoke got out, the computer booted, and appears (from console and diagnostic checks) to have 32kW of memory! The PDP-12 only had room for 8 kW inside, but could connect to an external box that would include up to 24kW of additional core. Vince's expansion plugs into the five flip chip slots that would normally lead to the external unit. All memory hardware is on those five cards, with a six card providing an electrical connection. More soon! #umdpdp12 #pdp12 #pdp #dec #RetroComputing #VintageComputing
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Today, Zach and I got Vince Slyngstad's PDP MM8/I memory expansion installed in our PDP-12! No magic smoke got out, the computer booted, and appears (from console and diagnostic checks) to have 32kW of memory! The PDP-12 only had room for 8 kW inside, but could connect to an external box that would include up to 24kW of additional core. Vince's expansion plugs into the five flip chip slots that would normally lead to the external unit. All memory hardware is on those five cards, with a six card providing an electrical connection. More soon! #umdpdp12 #pdp12 #pdp #dec #RetroComputing #VintageComputing
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A video from the same session: #umdpdp12 #pdp #pdp12 #dec #RetroComputing #VintageComputing
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A video from the same session: #umdpdp12 #pdp #pdp12 #dec #RetroComputing #VintageComputing
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A video from the same session: #umdpdp12 #pdp #pdp12 #dec #RetroComputing #VintageComputing
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A video from the same session: #umdpdp12 #pdp #pdp12 #dec #RetroComputing #VintageComputing
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A video from the same session: #umdpdp12 #pdp #pdp12 #dec #RetroComputing #VintageComputing
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PDP-12 #435 playing Spacewar! for the first time in over two years thanks to some debugging by us and our much more experienced friends on the VCF forums.
First, we noticed that minicom was inserting CRs in front of LFs when sending paper tapes, so we switched to a different paper tape sender, and second, someone pointed out that it looked like our 2nd 4K core was not inserted correctly (two cables were backwards). Fortunately, the magic smoke didn't get out.
The machine booted up like a champ, and April and Zach got their first chance to play the original deathmatch game. 💚
#umdpdp12 #pdp12 #pdp #dec #VintageComputing #RetroComputing
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PDP-12 #435 playing Spacewar! for the first time in over two years thanks to some debugging by us and our much more experienced friends on the VCF forums.
First, we noticed that minicom was inserting CRs in front of LFs when sending paper tapes, so we switched to a different paper tape sender, and second, someone pointed out that it looked like our 2nd 4K core was not inserted correctly (two cables were backwards). Fortunately, the magic smoke didn't get out.
The machine booted up like a champ, and April and Zach got their first chance to play the original deathmatch game. 💚
#umdpdp12 #pdp12 #pdp #dec #VintageComputing #RetroComputing
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PDP-12 #435 playing Spacewar! for the first time in over two years thanks to some debugging by us and our much more experienced friends on the VCF forums.
First, we noticed that minicom was inserting CRs in front of LFs when sending paper tapes, so we switched to a different paper tape sender, and second, someone pointed out that it looked like our 2nd 4K core was not inserted correctly (two cables were backwards). Fortunately, the magic smoke didn't get out.
The machine booted up like a champ, and April and Zach got their first chance to play the original deathmatch game. 💚
#umdpdp12 #pdp12 #pdp #dec #VintageComputing #RetroComputing
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PDP-12 #435 playing Spacewar! for the first time in over two years thanks to some debugging by us and our much more experienced friends on the VCF forums.
First, we noticed that minicom was inserting CRs in front of LFs when sending paper tapes, so we switched to a different paper tape sender, and second, someone pointed out that it looked like our 2nd 4K core was not inserted correctly (two cables were backwards). Fortunately, the magic smoke didn't get out.
The machine booted up like a champ, and April and Zach got their first chance to play the original deathmatch game. 💚
#umdpdp12 #pdp12 #pdp #dec #VintageComputing #RetroComputing
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PDP-12 #435 playing Spacewar! for the first time in over two years thanks to some debugging by us and our much more experienced friends on the VCF forums.
First, we noticed that minicom was inserting CRs in front of LFs when sending paper tapes, so we switched to a different paper tape sender, and second, someone pointed out that it looked like our 2nd 4K core was not inserted correctly (two cables were backwards). Fortunately, the magic smoke didn't get out.
The machine booted up like a champ, and April and Zach got their first chance to play the original deathmatch game. 💚
#umdpdp12 #pdp12 #pdp #dec #VintageComputing #RetroComputing
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Well, our eagle-eyed and experienced friends on the VCF forums noticed something that seemed a little weird about our PDP-12... the W025 cards for Field 1 were not crossed, but were parallel like the ones for Field 0. (Seems logical, right?)
Looking at old photos showed that Field 1 used to be crossed, just like some other PDP-12s we know about.
Zach and I swapped the cards back today and...
#umdpdp12 #pdp12 #dec #pdp #RetroComputing #VintageComputing
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Well, our eagle-eyed and experienced friends on the VCF forums noticed something that seemed a little weird about our PDP-12... the W025 cards for Field 1 were not crossed, but were parallel like the ones for Field 0. (Seems logical, right?)
Looking at old photos showed that Field 1 used to be crossed, just like some other PDP-12s we know about.
Zach and I swapped the cards back today and...
#umdpdp12 #pdp12 #dec #pdp #RetroComputing #VintageComputing
-
Well, our eagle-eyed and experienced friends on the VCF forums noticed something that seemed a little weird about our PDP-12... the W025 cards for Field 1 were not crossed, but were parallel like the ones for Field 0. (Seems logical, right?)
Looking at old photos showed that Field 1 used to be crossed, just like some other PDP-12s we know about.
Zach and I swapped the cards back today and...
#umdpdp12 #pdp12 #dec #pdp #RetroComputing #VintageComputing
-
Well, our eagle-eyed and experienced friends on the VCF forums noticed something that seemed a little weird about our PDP-12... the W025 cards for Field 1 were not crossed, but were parallel like the ones for Field 0. (Seems logical, right?)
Looking at old photos showed that Field 1 used to be crossed, just like some other PDP-12s we know about.
Zach and I swapped the cards back today and...
#umdpdp12 #pdp12 #dec #pdp #RetroComputing #VintageComputing
-
Well, our eagle-eyed and experienced friends on the VCF forums noticed something that seemed a little weird about our PDP-12... the W025 cards for Field 1 were not crossed, but were parallel like the ones for Field 0. (Seems logical, right?)
Looking at old photos showed that Field 1 used to be crossed, just like some other PDP-12s we know about.
Zach and I swapped the cards back today and...
#umdpdp12 #pdp12 #dec #pdp #RetroComputing #VintageComputing