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JAQ's Blog - Electronics, Microcontrollers, DEC Minicomputers, Raspberry Pi, Airplanes and other stuff....
Total: 50 results found.
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SD-Systems SBC-200 Testing - Part 2
... components were easily available from Jaycar or RS Components, the 270 ohm 9 resistor SIP resistor packs were proving difficult to lo
e and these were in the partial kit. Thanks Philip. My ...
DECUS NOPSIG Posters
... on each poster for the archive.org link. The text below each poster is written on the back of the originals. The NOP SIG is dedi
ed to the retention, restoration and running of Nostalgic, ...
IOT for the Small Block - Part 1
... etc) and while there are some interesting, fun and possibly limited utility appli
ions of IOT for the average apartment dweller, for those of us that live on lifestyle blocks IOT devices really can help. ...
TRS-80 Model 1 FreHD Expansion Interface
... by the most dedi
ed hardware hackers. This short Youtube video describes the prototype. The production board was created using the Eagle ...
MS11-JP MOS Memory SN#1958348/78
... exhibit the same symptoms. Attempts to access the board give a Bus Error. Initial indi
ions are that the issue is in the refresh generation circuit. We will see..... ...
Kaypro 4/83 Floppy Disk Woes.....
... KayPlus ROM worked but there were a few odd behaviours running some CP/M appli
ions that needed further investigation. In May 2014 a Kaypro II was purchased from eBay by phorgen on the Vintage Computer ...
GPS Connection to Hans Summers Ultimate 3 QRSS Kit
... this (and the GPS almanac for fast power on) when the power is cycled requires a 2.7v-5.5v power source on the V_BACKUP line. With fast startup not critical for this appli
ion and not wanting to ...
Making ROMs with SRECORD
... while doing the project was how to program the EEPROM with multiple ROM images. The solution was the SRECORD set of utilities and specifically SREC_
. The following ...
Kaypro / FreHD Adaptor
... had no luck lo
ing the '83 version of the Advent TurboROM. If you have a Kaypro with this installed we would love a copy for testing. I have a 4/83 which has a 4K ROM but the Kayplus '83 ROM ...
System 80 / FreHD Adaptor
... to the expansion connector on the left side of the expansion interface. This expansion connector is a dupli
e of the connector on the back of the keyboard with the exception of the dynamic memory ...
TRS80 Model 1 Fixup - Part 2
... chips replaced and a cable made up the initial indi
ions where that the Expansion Interface worked fine. At this point I realized why they put these in cases... where to put the monitor when ...
TRS80 Model 4 128K Upgrade
... few appli
ions and in most cases as a RAM disk.... so upgrading to 128K wasn't high on my list of "must do" items. Contributing to this was my workhorse machine being a "Non Gate Array" variant ...
TRS80 Model 4 Rebuild - Part 3
With the replacement header installed on the serial interface board and the modifi
ions removed from the floppy drive controller it was time to reassemble the machine. Nothing special here but ...
SBC6120 PDP8 Replica - Part 4
... component side of the board solder a single pin on the lower side of the switch to hold the switch in place while using a ruler to align the top edges of all switches. This sounds more compli
TRS80 Model 4 Rebuild - Part 2
... 1980's when the stock internal drives were being replaced with four half height units. Mainboard floppy disk controller SIL header In addition to the connector replacement was another modifi
SBC6120 PDP8 Replica - Part 3
... to prevent overspray onto the switch bodies A very impressive result for less then NZ$10 in paint and some qualified assistance. For anyone looking to repli
e this I used Humbrol ...
SBC6120 PDP8 Replica - Part 2
... are a few photos that might help you out. Hope the quality is good enough. An Arduino 6 pin header before modifi
ion. The 6 pin header with two ...
SBC6120 PDP8 Replica - Part 1
... with microcomputers I spent a lot of time dreaming about those machines in my collection of DEC product
alogs. My father worked for the Physiology Department of the School of Medicine, University ...
Switching Mains Equipment with a Raspberry Pi - Part 2
... __name__ == "__main__": urls = ('/','root','/fence/(.+)','fence') app = web.appli
ion(urls,globals()) render = web.template.render('/home/pi/fence/templates/') app.run() ...
Supporting Generic Kermit 4.11 in your CPM/80 BIOS
... system with IOByte".... but what did that mean? Google pointed to many sites that talked about IOByte (or dupli
ed detail from the DR documentation). There was much comment about how ...
PDP8 SBC6120 FP6120
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