January 24, 2016
I've reorganized the articles page into sections, and each section is arranged chronologically (as much as it can be known). This was triggered by having more things to add to the page.
- Tom Pinard sent in a scan of a Sol-20 ad from the March, 1977, issue of Ham Radio Horizons Magazine.
- Realizing I was missing many ads, I methodically went through all the issues of Byte Magazine and grabbed all the Procesor Technology ads. I didn't capture duplicates, and sometimes skipped the page containing nothing but the dealer's list (which didn't change that much from the month before). The collection of ads is rather huge due to the large number of color images, which don't compress as well as B&W text.
- While flipping through the Byte Magazines, I found a review of the Sol-20 from April 1978.
December 22, 2015
Over the past year, I've received a number of contributions from various people, but due to a lack of time, they got put off until now. Consider it a Christmas present now.
- Mike Douglas has set up a website, including a section on the Sol-20. It is one to watch!
- Martin Eberhard has been hard at work, creating some very useful drivers and programs for his Helios system.
- Philip Lord patched the program for the ALS8 assembler so it would work properly with the Sol. Both the unpatched and patched versions are available.
- Doug Smythies has scanned three documents which are new to Sol20.org. They are an article by PT founders Lee Felsenstein and Robert Marsh, a Helios II brochure, and the March 1977 Sol Price List.
- Emmanuel Roche found the listing for an original game called 'balloon' written in assembly language for the Sol. He painstakingly retyped the article and the program source. The site now has the article text, the source code, and a virtual disk image of the program.
- The December 1976 issue of Byte Magazine had a review of the VDM-1 video card for S-100 systems.
September 28, 2014
This website was originally created between 1999 and 2001, and the HTML style reflected that (using tables for positioning; inline HTML presentation attributes, ...).
After too much delay, I've converted the HTML coding style to use more modern features, including some HTML5 tags. I've also removed some css hacks which were in place for IE 6. Please let me know if anything looks broken in your browser (other than IE 6).
I've also swept up a number of contributions people have submitted over the past year:
- Phil Lord scanned the Processor Technology Sol-20 Press Release from September, 1976. What a great find!
- Russel Alikberov has created a new version of his PT Music score playing software, located in his code repository, and mentioned on the programs page.
- Mike Douglas passed along a tip on how to get ENT files to download to a Sol reliably at 9600 baud. The tip is located near the top of the programs page.
February 27, 2013
Mr. Emmanuel Roche has typed up a review of the DDS debugger from Creative Computing, written by Steve North.
Perhaps the last man on earth with a running Helios system, running PTDOS, Martin Eberhard has written an XMODEM driver for PTDOS, allowing reliable transfer of files between a modern computer running xmodem software and a PTDOS system. He has made the software available in case there is another PTDOS-phile who could use it. This is the first update to the PTDOS page in nearly nine years.
February 24, 2013
A few items have been sent in over the past few months; here they all are in one update.
- 4KRA SRAM module User's Manual (contributed by Paolo Binotti)
- 8KRA SRAM module User's Manual (contributed by Paolo Binotti)
- Claudio Larini has found that the source file FOCAL.ASM inside the cpmug.zip file is corrupted at line 115. If anybody happens to have a clean copy of this, please let me know so I can fix it.
- Martin Eberhard has created a MM5204 EPROM programmer, the type of ROM commonly found in Sol-20 (and other S-100) systems. Details are on the links page.
- Emmanual Roche has noticed that DDS.ENT on the programs page was not the full DDS debugger program (in fact, just a tiny bit of code). If anybody has the source or binary for DDS, please let me know.
July 27, 2012
There have been no updates in bit over a year! However, I have received a few items which have been sitting in my in box for a while that I'm just now getting around to posting.
- Phil Lord sent in a scan of the manual for the CDC 64KB RAM card he uses in his Sol, along with memory tests for it in the form of ENT files.
- Phil also created ROM .bin images for the character generators used by the Sol. These could be useful for someone repairing a damaged machine, as the original character generators probably are no longer made.
- I've reviewed the links page, fixing a few links, removing a couple dead ones, and adding an interesting page where someone ported some Sol-20 games to run on an Amstrad CP/M machine.
... (older items are no longer noted) ...
Web site started