67958aa65a
1. Rework Processor internal timing and throttling mechanism during I/O. 2. Revise Console statistics display, add instruction counter. 3. Correct (again) CFA/CFR instruction when sign is included in field. 4. Correct B-register modification of words during Cardatron and magnetic tape input. 5. Clear Processor alarms on Reset/Transfer. 6. Add links to wiki on index and home pages. 7. Eliminate B220Util CSS class functions in favor of DOM classList methods. 8. Attempt to reproduce "Sundland Beige" color for the panels. 9. Correct formatting of tab stops for B220ConsolePrinter. 10. Reduce Whippet printer speed from 5000 to 1000 cps. 11. Reduce Console update frequency from every 50 to 100 ms; increase lamp glow update factor from 0.25 to 0.75. 12. Allow click of white button below console register lamps in addition to clicking the lamps themselves to toggle the lamp state. 13. Rework the way that white vertical bars are drawn on registers. 14. Allow B220PaperTapeReader to properly send sign-2 alphanumeric words with trailing spaces if the tape image file has been space-trimmed on the right. 15. Clear the paper tape reader view window when loading new tapes. 16. Revise yet again the setCallback() delay deviation adjustment algorithm.
The Burroughs 220 was a late-1950s, decimal, vacuum-tube, core-memory computer system. Some consider it to be the last of the major vacuum-tube computers.
The 220 was the follow-on product to the ElectroData/Burroughs Datatron 205. It was initially developed as the ElectroData Datatron 220 but renamed after Burroughs acquired ElectroData in 1956. The system was initially released in 1958. It did well with both scientific and commercial applications, but being a vacuum-tube system at the beginning of the transistorized era, was only modestly successful.
The ElectroData Division of Burroughs went on to create a number of successful systems after the 220, including the B100/200/300 series, the B1700/1800/1900 series, the B2000/3000/4000/V Series, the B5000/5500, and finally the B6000/7000/A Series, which are still produced and sold today as Unisys ClearPath MCP systems.
The main goal of this project is creation of a web browser-based emulator for the 220.
A second goal is reconstruction of the Burroughs Algebraic Compiler (BALGOL), an Algol-58 compiler written for the 220 by a team from Burroughs that included Joel Erdwinn, Jack Merner, Donald Knuth, Dave Dahm, and Clark Oliphint.
The contents of this project are licensed under the MIT License.
| Related Sites | URL |
|---|---|
| Emulator hosting site | http://www.phkimpel.us/Burroughs-220/ |
| Emulator documentation | https://github.com/pkimpel/retro-220/wiki |
| Burroughs 205/220 blog | http://datatron.blogspot.com |
| 220 documents at bitsavers | http://bitsavers.org/pdf/burroughs/electrodata/220/ |
| BALGOL compiler listing | http://archive.computerhistory.org/resources/text/Knuth_Don_X4100/PDF_index/k-1-pdf/k-1-u2196-balgol220compiler.pdf |
| Datatron 205 site | http://www.phkimpel.us/ElectroData-205/ |