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Don writes...
Hello Everyone:

I remembering playing Targ on the Sol-20 that my Dad bought. I just found The Sol-20, cassettes, and users manual. Not sure if it works and don't have the power supply cord. What kind do I need and where could I find one. I have a monitor, cords, and cassette player. It is in Colorado. If anybody is interested in buying, let me know. Thanks.
Posted on July 23, 2017 - 19:45:45 PDT
Rick Downs writes...
I built my first SOL-20 in 1976, and thus began my career in related computer industry. I still have the original with many upgrades! My thanks to the early pioneers for bringing at great product to us hobbyists.

Posted on July 1, 2017 - 19:06:28 PDT
Tucker Zischka writes...
My Grandfather had built one of the Sol-20 from the kit. The computer has been sitting in my grandmother's garage since the day they upgraded from it. I finally decided to take it down and start working with it. Haven't quite figured it out yet, but Ill get there.

Thank you for the awesome resources!
Posted on May 9, 2017 - 19:53:47 PDT
Jay Box writes...
I needed the manual for the 8K Static Ram board (version with the switches at the top right corner) and found it in your "Manuals" download section. Thanks. Nice looking website; I've stored its URL in my Vintage Systems links.
Posted on March 21, 2017 - 18:39:44 PDT
Justin McDermid writes...
I had two Sol 20 computers, just sold one of them. I still have lots of other old equipment.

Posted on February 27, 2017 - 14:46:29 PST
Earl Baugh writes...
I have 2 of the Sol 20's and SW and manuals... what are you still looking for?
Posted on January 13, 2017 - 14:34:05 PST
Walt Perko writes...
I guess I should mention that I am selling off the rest of the vintage S-100 and Apple stuff I have to get the seed money I need to build-up a couple hundred RoboGuts™ Kits so I can start teaching classes at the local Boys & Girls clubs, Scouts, YMCA etc...

No I do not want to break up this bundle.
Posted on November 19, 2016 - 18:08:15 PST
Walt Perko writes...

Long time since I (sadly) sold the Sol-20 I built from a kit. My first computer was a MITS Altair 8800, then I got a Motorola MEK6800D1 (still have it), then after selling the Altair I had money to build the Sol-20 and like a fool sold it to get an Apple II. I had lots of fun with the Apple but wish I had kept the Altair and Sol-20.

Anyway now I've been developing beginner robotics S.T.E.A.M. program for young children 5+ ... and any other beginners.
Posted on November 19, 2016 - 18:05:01 PST
Gil Gutierrez writes...
Great site! Thanks Mr Battle! I found this web-site a few years ago when I was restoring my Sol-20. I come back from time to time and always enjoy the new information that is periodically added. I bought a Sol-20 a few years ago and set it up every now and then to relive the early days of computing with my sons and grandsons. They like to hear the stories of how computers and computer gaming have evolved over the years. They get a kick out of playing Target. The latest Sol project I have in mind is to make a reproduction Sol-20 manual. Anyone ever make their own manual?
Posted on October 9, 2016 - 08:38:59 PDT
Lawrence Zalenski writes...
Apparently Steve Jobs used Sol 20 ideas when creating the Apple I and Apple II computers.

Everyone needs to look high and low to find ALL the stuff for this computer so it can be integrated into this website: [1] Contents of Proteus software collections #4, #5, #6, #9, #10 [2] source code to Processor Tech software [3] Your files, programs, disks, tapes, WAV files of tapes [4] Original documents and manuals [5] More personality module ROMs

The SOL-20 appears to be a much more frendlier alternative to the Altair, IMSAI, and other S-100 computers.
And this site presents computer scientists with a wonderful Solace emulator with complete source code to improve and explore.

It would be great to see some new programs, games and modules created.
And I would like to see all the 8080 stuff ported to this emulator.
Posted on September 24, 2016 - 15:27:32 PDT
Andy Hill writes...
Fantastic resource. Thanks for maintaining it. In 1981-82 we had a Sol 20 with HELIOS II disk drive in the then-embryonic computer room in Semiahmoo High School, White Rock, B.C., Canada, which was used to introduce students to computers and programming in BASIC until we got the first 8K Commodore PET later. It sparked my interest in computers as a 17 yr old which has continued (rabidly) until this very day.

Our HELIOS II drive was *notoriously* unreliable, and the support tech was coming in weekly to fix the thing. The school used it for a few support programs (including a Library book inventory/ control program written by yours truly), and when the school got rid of it, I inherited all the manuals for everything which unfortunately were later lost in a storage incident.

I hope to acquire a system soon with the HELIOS II and put it back in commission - if only so I can remember all the swear words I threw at the thing in Grade 11 :)
Posted on September 12, 2016 - 17:35:11 PDT
Evan Daily writes...
THERE IT IS! I could never remember what that PC was that my dad bought when I was a kid. I started my programming on this old boy. Thanks for making this site. I am going to start looking for one of these right now.
Posted on February 18, 2016 - 10:03:39 PST
Santo Nucifora writes...
Thanks for maintaining this site. I have visited quite often and do have one Sol-20 I am still in the process of restoring. I also have a working Sol-20/Helios II system that works beautifully after replacing some capacitors to restore the drive. Pictures I took some time back are here if you're interested. I am not an original owner/builder but am fascinated by computers of this era. Thanks again.
Posted on February 3, 2016 - 18:33:25 PST
Marco Pontello writes...
Amazing trip in computer history. Thanks for the great collection of informations.
Posted on February 2, 2016 - 16:23:14 PST
Doug Smythies writes...
Great web site. I have a SOL-20 that I built around 1977. I also have an IMSAI 8080 that I built in 1976.
Posted on October 29, 2015 - 08:24:42 PDT
Ken Meltsner writes...
Thanks for putting this together, My high school had one of the earliest SOL-20s (1977? 1978?) along with the North Star drives (and later a North Star Horizon). Somewhere lost in time there's a machine language tank game that one student wrote, as well as a CP/M bios which would detect whether it was running on a Horizon or on a SOL-20 and switch configurations automatically. I'm still unreasonably proud of writing the latter -- quite a bit of functionality to cram into 256 bytes.
Posted on September 10, 2015 - 10:38:00 PDT
I have a SOL-20, with monitor, and pennywhistle 103 modem, sitting in my storage. Haven't powered it up since about 1992. I'm wondering what I might have to replace before applying power and frying things.
Posted on May 17, 2015 - 17:18:31 PDT
Bill Schneberg writes...
I just acquired some computers from a storage spot in Santa Barbara and within was a Sol 20. I purchased a Vector Graphic, new in 1980, so I was familiar with the brand, but did not know the details. The Sol 20 is a great website.
Posted on May 9, 2015 - 11:27:17 PDT
Chris Garrigues writes...
Somewhere around 1976 or 1977 my best friend was riding a bus down Mission street and saw a store front with a sign that said "The Computer Store of San Francisco" as the bus left the stop on 7th street. He got off at 6th sttreet and walked back to see what the hell this was.

Inside he found a CompuColor 2000, an Apple I, Altairs, Imsai's, and several SOL-20s as well as magazines, etc.

The next day I joined him in a revisit to this magical place.

Karl and I became the "Store Teenagers" and hung out there learning about computers and programming on the SOL-20, etc.

Oh yes, also lots of games of TREK80 and TARGET.
Posted on April 24, 2015 - 13:04:08 PDT
Steven Marzuola writes...
Never saw a Sol 20, but I read this article today.
Posted on April 7, 2015 - 01:37:39 PDT

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