Back in 2003, I was fortunate enough to be contacted by Max Blomme, a former Wang engineer. He had come across a box of schematics that had spent a decade or two in a corner of his garage. At the time my own interest only went as far as the Wang 2200, but this box contained schematics for some of the Wang calculators and the 1200 word processor. I scanned all of it despite my limited interest, and returned the originals to Max.
That was a fortunate decision, as in 2008 I was given a Wang 1220. This page contains links to all the schematics related to the Wang 1200, 1220, and 1222. No doubt these scans could be better, and the schematics probably weren't the last revision, but it is far better than nothing.
Although these schematics were the property of Wang Labs, and what was left of Wang was sold to Getronics in 1999, I'm not sure who holds copyright on them. My intention is not to violate anybody's copyrights, and I hope the rightful holder is OK with me sharing these 25 year old documents for a machine that no longer has any commercial value. The purpose of publishing them is:
- for historical interest
- to aid those attempting to repair a broken 2200
- to help understand the internal operation in order to write an accurate emulation
If the rightful copyright owner wishes me to desist, I will do so immediately. If they instead desire that I include some legal disclaimer, I'd be more than happy to. Since that hasn't happened yet, I hereby state for the record:
I don't own copyright on these schematics, and I do not give right to anybody to use these schematics. If someone somehow has any commercial interest in using this information, I strongly encourage them to seek out the rightful owners of the copyright. In the mean time, I will attempt to do so myself.
The schematics are 11"x17" and were scanned at 600 dpi, 1 bpp. While viewing them at at full resolution on a monitor isn't very practical, the extra resolution is required when printing out the documents. Adobe's PDF viewer also does a nice job of scaling to gray, which makes them much more readable on a monitor.
Update, July, 2016:In 2016, Mike Bahia donated a set of field schematic prints, including those for the Wang 1200. I scanned them all again at 600dpi grayscale, made some contrast adjustments, then converted them to 300dpi grayscale and 600dpi B&W as well. Immediately below are the PDFs of those later scans. If you find that these scans aren't good enough for your purposes, contact me as I have the original 600 dpi grayscale scans as well.
- 300dpi grayscale schematic set (PDF, 69MB, 73 pages)
- 600dpi B&W schematic set (PDF, 14MB, 73 pages)
| Board | Model | Description | Pages | |
|---|---|---|---|---|
| model1200,1222-idx | 1200/122 | Model 1200/1222 Index | 1 | model1200,1222-idx.pdf |
| 5776-975 | 1200 | Typewriter Schematic | 2 | 5776-975.pdf |
| 6013 | 1200 | Left Keyboard | 1 | 6013.pdf |
| 6014 | 1200 | Right Keyboard | 1 | 6014.pdf |
| 6152 | 1200 | RAM (MOS memory) | 1 | 6152.pdf |
| 6164 | 1200 | Power Supply | 1 | 6164.pdf |
| 6165 | 1200 | Power Supply and Motherboard | 2 | 6165.pdf |
| 6165-1 | 1200 | Cable Right,Left Tape Deck,Panel Transistor Cable | 1 | 6165-1.pdf |
| 6170 | 1200 | Typewriter Input | 1 | 6170.pdf |
| 6171 | 1200 | Typewriter Output Driver | 1 | 6171.pdf |
| 6172 | 1200 | Typewriter Output Control | 1 | 6172.pdf |
| 6173 | 1200 | KA KB Code Converter | 1 | 6173.pdf |
| 6174 | 1220 | Timing KA KB Registers | 2 | 6174.pdf |
| 6175 | 1200 | Left & Right Tape Deck | 1 | 6175.pdf |
| 6176 | 1200 | Tape Output and Mode M Control | 1 | 6176.pdf |
| 6177 | 1200 | ROM Address | 1 | 6177.pdf |
| 6178 | 1200 | Tape Input Control | 1 | 6178.pdf |
| 6192 | 1200 | ALU | 1 | 6192.pdf |
| 6195 | 520/600 | RAM Address | 1 | 6195.pdf |
| 6220 | 1220PIO | Typewriter Output Timing and Paper Tape Punch Control | 1 | 6220.pdf |
| 6231 | 1200 | Tape and Motor Control | 1 | 6231.pdf |
| 6237 | 1200 | Communications Board | 1 | 6237.pdf |
| 6264 | 1200 | Dual ROM Control/P1 & P2 Cable Assembly | 2 | 6264.pdf |
| 6293 | 1200 | Solid State ROM | 1 | 6293.pdf |
| 6370 | 1200 | Typewriter Input | 1 | 6370.pdf |
| 6371 | 1200 | Teletypwriter Output Driver | 1 | 6371.pdf |
| 6372 | 1200 | Teletypewriter Output Control | 1 | 6372.pdf |
| 6373 | 1200 | KA KB Code Converter | 1 | 6373.pdf |
| 6384 | 1200 | Echo Memory | 1 | 6384.pdf |
| 6385 | Tester 1200 | Echo Transmit and Receive | 1 | 6385.pdf |
| 6393 | 1222 | Solid State ROM with 12 Word Modification | 1 | 6393.pdf |
| 6393-1 | 1200 1/2 Index | Solid State ROM with 12 Word Modification | 1 | 6393-1.pdf |
| 6405 | 1200 | Keyboard Control | 1 | 6405.pdf |
| 6440 | 1222 | Power Supply Regulator | 1 | 6440.pdf |
| 6497-260 | 1222 | Typewriter Wiring | 1 | 6497-260.pdf |
| 6508 | 1222 | Cable Junction Board | 1 | 6508.pdf |
| 6510,6511,6512,6513 | 1222 | Special Function/Code Board/Home Position/Shift | 1 | 6510,6511,6512,6513.pdf |
| 6514,6515 | 1222 | Character Detector/Encoder | 1 | 6514,6515.pdf |
| 6516 | 1222 | Typewriter Input Circuit | 1 | 6516.pdf |
| 6516-1 | 1222 | Typewriter Input Circuit | 1 | 6516-1.pdf |
| 6517 | 1222 | Driving Circuit | 1 | 6517.pdf |
| 6518 | 1222 | Micro Processor | 1 | 6518.pdf |
| 6519 | 1222 | Input Decoding | 1 | 6519.pdf |
| 6520 | 1222 | Typewriter Output Timing | 1 | 6520.pdf |
| 6523,6524 | 1222 | Left/Right Keyboard | 1 | 6523,6524.pdf |
| 6530 | 1222 | Motherboard | 1 | 6530.pdf |
| 6536 | 1222 | Typewriter Input Cable Board | 1 | 6536.pdf |
| 6705 | 1222 | Simulator | 1 | 6705.pdf |
| 6712 | 1200/1222 | Motorola ROM | 1 | 6712.pdf |
| 6714 | 1222 | CRT RAM | 1 | 6714.pdf |
| 6715 | 1222 | CRT Scan Board | 3 | 6715.pdf |
| 6719 | 1222 | Telecommunication | 1 | 6719.pdf |
| 6720 | 1222 | Typewriter Output Timing with Paper Tape Punch Output | 1 | 6720.pdf |
| 6721 | 1200 | Telecommunications | 1 | 6721.pdf |
| 6737 | 1200/1222 | Telecommunications Board | 1 | 6737.pdf |
| 6780 | 1222/LPO | Output Controller | 1 | 6780.pdf |
| 6781 | 1222 | Microprocessor | 1 | 6781.pdf |
| 7020 | 1222 | Telecommunications Typewriter Output Timing | 1 | 7020.pdf |