This is a still *developing* version of my Small Scale Experimental Machine (SSEM) Manchester Mark 1 emulator. The assembler and emulator are pretty much fully implemented, but there are still several small features to add, and bugs to be ironed out.
For the latest new features in this and previous versions, see the 'History' file. See the 'StillToDo' file for details of features still to be added. I've tried to grey out all the options not yet implemented, but don't be too surprised if I missed one or 2. The program may be a little scrappy in parts, and the frontend unwieldy, this is not surprising since 80% of this emulator has been written after midnight, and not a short time after either :o)
In the interest of not being over complex, this emulator does not attempt to completely recreate the original SSEM, as Andrew Molyneux's PC attempt does, by implementing every last switch. Rather it includes the features necessary for the user to program the machine, and get something comprehensible back out.
The main purpose behind this assembler and emulator is to allow Acorn users to participate in a programming competition. Read the 'competition file for more details', or if I haven't written it yet, refer to the Babe web page below.
For details about the SSEM itself, read the programmers reference manual, it is not written for this emulator or assembler, so any references to such programs are Andrew Molyneux's emulator.
Thanks to James Miller for reporting bugs with the display code (which I knew about and was too lazy to fix) and the STO function, which wasn't reversing some of the results and was thus presenting incorrect information, and a fix for the returning to the desktop problem. With some help from him I've now adjusted the code to work fine, and thus the result fo the HCF code is correct.
There is unlikely to be further development of Babe, since I am buried under a ton of work, and will then continue developing my 6502 emulator (a damn sight better coded than this one!!). I've released this version decrunched so that any further modifications can be made to it. My coding style is atrocious, don't moan about it, it was a scrappy project based on a scrappy idea coded post midnight with nothing better to do, that said it's quite interesting!
If you discover any bugs, please inform me about them via email to
DavidSharp@ThePentagon.com
The most recent version of Babe (should be one very soon) can always be downloaded from:
If you would like, I am quite willing to supply the source code, just send me an email. BTW, yes, the icon is a picture of Alicia Silverstone taken from the web, but no, she wasn't naked! :o)
Known bugs:
*At the moment, this emulator only runs in mode 28 (640x480x256) which means that it tends to be A5000 and upwards only. I will endevour to change this, as there isn't much to the display code anyway.
* When returning to the desktop from the emulator, the palette and/or text is often screwed up, simply press F12 to fix - this will be corrected VERY soon.
* The assembler will attempt to assemble anything, likewise the emulator!
