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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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---
title: Processor Technology Corp SOL - 10 / 20
categories:
- Computers
types:
- Professional Computer
origins:
- U.S.A.
years:
- '1976'
cpus:
- Intel 8080A
params:
name: SOL - 10 / 20
image: /media/museum/photos/processor-tech_sol20_1.jpg
company: /companies/processor-technology-corp
company_name: Processor Technology Corp
specs:
- label: NAME
value: SOL - 10 / 20
- label: MANUFACTURER
value: Processor Technology Corp
- label: TYPE
value: Professional Computer
- label: ORIGIN
value: U.S.A.
- label: YEAR
value: End of 1976
- label: BUILT IN LANGUAGE
value: Unknown
- label: KEYBOARD
value: QWERTY full-stroke keyboard
- label: CPU
value: Intel 8080A
- label: RAM
value: 8k, 16k or 32k (up to 48 KB)
- label: VRAM
value: 1 KB
- label: ROM
value: 1 KB
- label: TEXT MODES
value: 64 x 16
- label: GRAPHIC MODES
value: None
- label: COLORS
value: Unknown
- label: SOUND
value: Unknown
- label: I/O PORTS
value: RS 232, cassette, S100 Bus
- label: OS
value: CONSOL OS
- label: POWER SUPPLY
value: Unknown
- label: PRICE
value: Unknown
tabs:
- photos
- adverts
- hardware
- emulators
- links
- docs
forum_thread: 348
photos:
- title: SOL 10 MAINBOARD
subtitle: ''
text: ''
image: /media/museum/photos/sol4.jpg
- title: SOL-20 MAINBOARD
subtitle: ''
text: ''
image: /media/museum/photos/sol3.jpg
- title: LEFT AND RIGHT SIDES
subtitle: ''
text: ''
image: /media/museum/photos/processortech_sol_bothsides_s1.jpg
- title: FRONT
subtitle: ''
text: ''
image: /media/museum/photos/sol20_opened_1.jpg
- title: SOL-20 OPENED
subtitle: ''
text: |-
This is where the expansion boards are mounted. Here are three 16k RAM expansion boards and one disk-controller board.
Notice the big power-supply on the left.
image: /media/museum/photos/processor-technology_sol20_inside_1.jpg
- title: 'SOL-20 OPENED #2'
subtitle: ''
text: 'Different combination of expansion cards : There are a Processor Tech 64K memory board, a Northstar Dual Density disk controller board and a Software Technology sound card (wow).'
image: /media/museum/photos/sol20_opened_2.jpg
- title: SOL-20 REAR
subtitle: ''
text: ''
image: /media/museum/photos/processor-technology_sol20_rear_2.jpg
- title: SOL STAR
subtitle: ''
text: |-
'Sol Star' name probably came from the dual floppy drive unit and controller card made by NorthStar.
Each unit was equipped with a 179 KB Shugart SA-400 floppy drive.
image: /media/museum/photos/proctech_sol_solstar_1.jpg
- title: REAL COOL PICTURE
subtitle: ''
text: It is a memory dump done on a 1977 Sony TV Set !! ;-)
image: /media/museum/photos/sol5.jpg
adverts:
- title: 1977 ADVERT
subtitle: ''
text: ''
image: /media/museum/pubs/processortech_sol_pub_1.jpg
- title: SOL PRICE LIST
subtitle: ''
text: |-
**Sol Systems price list (january 1977)**
(K) = Kit (A) = Assembled
**Sol Terminal Computers**\
SOL-PC Single board (K) **$475**\
SOL-10 (K) **$795**\
SOL-20 (K) **$995**
**Memory Modules**\
PROM Resident Assembly Language (A) **$425**\
Interpretive Simulator (PROM option) (A) **$95**\
Text Editing (PROM option) (A) **$95**\
Erasable PROM module (K) **$65** (A) **$89**\
4 Kb. low power static Ram (K) **$159** (A) **$195**\
8 Kb. low power static Ram (K) **$295** (A) **$375**\
16 Kb. Dynamic Ram (A) **$529**
**Interface Modules**\
Parallel / Serial I/O Module (K) **$149** (A) **$199**\
System cassette interface (K) **$87** (A) **$119**\
Video Display Module (K) **$199** (A) **$295**
**Mass Storage System**\
Helios II Disk system (K) **$1895** (A) **$2295**
**Software**\
(C) = Cassette (P) = Paper tape\
Basic 5 (P) **$19.95**\
8K Basic (C) **$29** (P) **$37**\
New 8080 Focal (C) **$14.50**\
Trek 80 Video game (C) **$9.50** (P) **$14.50**\
GamePack 1 (C) **$9.50** (P) **$14.50**\
MathPack Video calculator (C) **$14.50** (P) **$19.50**\
Assembler (C) **$14.50** (P) **$19.50**\
ALS 8 (C) **$35** (P) **$45**
image: /media/museum/pubs/processortech_sol_system_1.jpg
hardware:
- title: HELIOS II DISK MEMORY SYSTEM
subtitle: ''
text: Dual 8'' floppy drive unit
image: /media/museum/hardware/processor_technology_sol20_helios2-disk.jpg
- title: 'HELIOS #2'
subtitle: ''
text: ''
image: /media/museum/hardware/proctech_sol_helios_2.jpg
- title: HOME-MADE DISK-DRIVES
subtitle: ''
text: These are two dual density floppy drives (Shugart SA400) in a home made wooden case.
image: /media/museum/hardware/sol20_drives.jpg
emulators:
- title: SOLACE
url: http://www.sol20.org/solace.html
platform: Windows
text: Emulates a SOL-20
links:
- title: A Sol-20 Web Page
url: http://www.thebattles.net/sol20/sol.html
text: Full of info !!!
docs:
- title: SOL SYSTEMS MANUAL
url: http://www.sol20.org/manuals.html
cover: /media/museum/docs/couvs/sol_systems_manual.jpg
text: |-
[**SOL SYSTEMS MANUAL**](http://www.sol20.org/manuals.html)written by Processor Technology Corporation
 compiled/archived by Roger Lewis ?\
 type of document : PDF\
 size : 8,3 MB\
 source : [www.sol20.org](http://www.sol20.org)
- title: SOLOS/CUTER USER'S MANUAL
url: http://www.sol20.org/manuals.html
cover: /media/museum/docs/couvs/sol20_solos-manual.jpg
text: |-
[**SOLOS/CUTER USER'S MANUAL**](http://www.sol20.org/manuals.html)written by Processor Technology Corporation
 compiled/archived by sol20.org\
 type of document : PDF\
 size : 99 KB\
 source : [www.sol20.org](http://www.sol20.org)
- title: BASIC/5 USER'S MANUAL
url: http://www.sol20.org/manuals.html
cover: /media/museum/docs/couvs/sol20_basic5.jpg
text: |-
[**BASIC/5 USER'S MANUAL**](http://www.sol20.org/manuals.html)written by Processor Technology Corporation
 compiled/archived by sol20.org\
 type of document : Unknown\
 size : 91 KB\
 source : [www.sol20.org](http://www.sol20.org)
- title: 16KRA - USER'S MANUAL
url: http://www.sol20.org/manuals.html
cover: /media/museum/docs/couvs/16kra_user_manual.jpg
text: |-
[**16KRA - USER'S MANUAL**](http://www.sol20.org/manuals.html)written by Processor Technology Corporation
 compiled/archived by sol20.org\
 type of document : PDF\
 size : 1,2 MB\
 source : [www.sol20.org](http://www.sol20.org)
- title: 48KRA-1 - DYNAMIC READ/WRITE MEMORY MODULE USER'S MANUAL
url: http://www.sol20.org/manuals.html
cover: /media/museum/docs/couvs/48kr-1_user_manual.jpg
text: |-
[**48KRA-1 - DYNAMIC READ/WRITE MEMORY MODULE USER'S MANUAL**](http://www.sol20.org/manuals.html)written by Processor Technology Corporation
 compiled/archived by Steve Maguire\
 type of document : PDF\
 size : 1 MB\
 source : [www.sol20.org](http://www.sol20.org)
- title: MICRO-DISK SYSTEM MDS-A-D DOUBLE DENSITY - MANUAL
url: http://www.sol20.org/manuals.html
cover: /media/museum/docs/couvs/sol20_microdisk.jpg
text: |-
[**MICRO-DISK SYSTEM MDS-A-D DOUBLE DENSITY - MANUAL**](http://www.sol20.org/manuals.html)written by North Star Computers
 compiled/archived by Doug Coward\
 type of document : PDF\
 size : 235 KB\
 source : [www.sol20.org](http://www.sol20.org)
oc_id: 344
source:
url: https://web.archive.org/web/20230604041241/http://www.old-computers.com/museum/computer.asp?c=344
date: '2023-06-04'
---
The Sol Computer was developed by Bob Marsh, Lee Felsenstein and Gordon French. Bob founded his company, Processor Technology, in April 1975 making 4K RAM memory boards for the Altair (cause MITS couldn't make a working memory board)
In June 1975, Bob and Les Solomon (technical editor of Popular Electronics) dreamed up the Sol-20 computer, Bob had a bunch of cheap walnut that he originally intented to use in a digital clock, he didn't want it to go to waste and used it in the Sol-20 (see picture).
About 10,000 of them were produced, some as kits, some as pre-builts. Based on the Intel 8080 microprocessor, this machine occupies a special niche in computer history for technical and esthetic reasons. It was one of the earliest to include a keyboard interface and support circuitry for full implementation of every 8080 function. It was a pioneer towards modern video output boards by having a design that actually put up alphanumeric characters on the screen, using a form of distributed processing that didn't lean on the CPU for all processing.
There were several models of the SOL-20 system :
\- The SOL System I ($1649 in kit or $2129 assembled), with SOL Operating System, 8 KB RAM, a 12" TV/Monitor, and a cassette recorder with BASIC software tape.
\- The SOL System II ($1883 in kit or $2283 assembled), is a SOL System I with 16 KB.
\- The SOL System III ($4750 in kit or $5450 assembled), is a system II with 32 KB RAM, a video monitor, the HELIOS II Disk Memory System and a DISK BASIC floppy.