bca1b7881a
. Adjust (hopefully for the last time) the RGB code for the 220 Sundland Beige panel color: it's now #C5B1A0. This has been a really difficult color to pin down. . Implement Clear Memory button on Console; implement "hover captions" for the Clear Memory and Load Card buttons. . Implement current block-number display on magnetic tape panel. . Implement "word index" counter on the B220MagTapeDrive panel to indicate the tape position in terms of 11-digit 220 words. . Implement Rewind and Unload buttons on the paper-tape reader. . Implement "word index" counter on the B220PaperTapeReader panel. . When a Cardatron or paper-tape reader encounters a sign=6 control word, do not reschedule the Processor if it has been halted. . Correct handling of reload-lockout in B220CardatronInput; change method of reporting Cardatron end-of-I/O signal to the Processor. . Correct this.pendingFinish timing race in B220CardatronOutput. . Correct validation when loading tape images in B220MagTapeDrive so that the drive will continue to be usable after an invalid image is detected. . Correct logic for spacing and searching magnetic tape blocks backwards. . Correct output of non-printing characters in B220PaperTapePunch. . Correct handling of invalid tape image characters in B220PaperTapeReader. . Implement additional tracing for paper-tape and magnetic tape I/Os (currently disabled).
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/ |