Introduction In May 2015 I went to VCF Southeast 3.0 in Roswell GA. This page has links to my two presentations and supporting materials. Where links are already provided in the presentations themselves, I’ve not included further copies of them below. Comments and other feedback are very welcome. Floppy Disk Imaging Powerpoint Presentation Z80 Assembly ..
I have some original VMS CDROMs. I was looking for a way to image these (for use with SIMH) and also a way to write ISO images back to blank CDs, to use on real hardware. This should be a fairly simple process using a modern Linux computer and the “dd” command, except for one ..
A recently acquired part of my collection includes what I think is an IBM processor presumably from a large system. The mounting frame is in a 3 x 3 grid. 6 modules are fitted and the other 3 locations are empty. This thing is huge – about 30 inches square. And the weight is around ..
I’m having a garage sale on Saturday 28 May 2016 to thin out my vintage computer collection a little. Everything put out for sale will be $5 to $20 per item – including large VAX machines. The items available include those shown below (and many more): The items include, for example: About 5 x VAX ..
This post takes a brief look at the current loop connectors used by DEC. The main focus of this post is the cabling needed to connect a VT220 terminal to a computer (such as a PDP-11/10) using the 20mA current loop interface. DEC’s standard connector DEC used an 8-pin Mate-N-Lok connector for all current-loop cabling ..
I’ve got a couple of projects on the go that use the PIC18F2550 (or PIC18F2553) microcontrollers. Normally I program PICs in-circuit with a PICkit 3 programmer while debugging my code. While this works great, I also need a way for people to easily field-upgrade my PIC firmware, without the need for a PIC programmer. So ..
There is no excerpt because this is a protected post.
What is it? The DECserver 200 is a “terminal server”. It enables up to 8 terminals to login to various DEC computer systems over an Ethernet link. Back in the day a DECserver it was used to connect terminals and printers to DEC systems. Typically these were VAX machines, though some PDP-11 systems also supported ..
I have a few VAX/VMS DECnet machines with node addresses in Area 4. Their full DECnet node addresses are 4.200, 4.202, etc. When I connect a DECnet machine in Area 33 (full address 33.13) to the same Ethernet segment, each of the Area 4 machines can see each other over DECnet, but the 33.13 machine ..