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The Acorn Emulation Page - Acorn BBC Micro Acorn BBC MicroThe Acorn BBC Micro came into being when Acorn won the contract fromthe BBC to produce a home computer that the BBC could use to promotetechnology and computing at home, school and in the work place. Acorn wonthis contract, mainly on the strength of their first Acorn Atom computerwhich had been fairly successful. The BBC models A and B were very successfulwith hundreds of British schools adopting them for what were to becomeclassics, such as Granny's Garden, or Pod. BBC's were also popular amongstthe more affluent enthusiast who wanted more than a Speccy could deliver,with it's built in BBC BASIC, and assembler in ROM, and massive expandabilityto boot. The Master and Master Compact were later introduced with a 3.5"disk drive and although not so popular, still sold well. Acorn then brokethe connection with the BBC, and skipped a generation from 8 bit to 32bit, years ahead of their time, to give us the ARM system we have today.65Host & 65Tube   Theseemulators were provided on the Applications 2 disk of every Acorn, up untilthe RISC PC. Hurriedly developed by Acorn ready for the Archimedeslaunch back in 1987, in order to tempt schools to dump their old 8 bitsand move up to the Archimedes, because, " you can run all your oldsoftware too!". This was never really true, since a fair amount ofBBC software had some form of copy protection, there was also the copyrightgrey area of making a copy to use on an Archimedes, as well as the moretechnical fact that 65Host wasn't up to the job. 65Host and it's sisteremulator 65Tube, although reasonable emulations, were by no means perfectas many users found to their disappointment when many games such as theclassic elite simply wouldn't work. On the other hand, in many cases 65Hostwas able to run the relatively undemanding educational software and textbased applications and was used for many years at my school.65Host is still freely available, but unfortunately it doesn't workon a RISC PC without being patched, and the command *CACHE I beingentered if you have a StrongARM in order to allow the program to run. Pcr13by Jan De Boer allows65Host to work on a StrongARM without the cache being disabled (so youcan have a 50MHz 6502Em). More recently, 65Host has become more importantin the world of emulation as the only program within which the sacred BBCB system ROMs are allowed to be distributed. This has led to many peopleon other platforms wanting to get hold of 65Host in order to extract theROMs for their own emulators (illegally).65Host v1.62 (1992)Speed Rating: ARM3  StrongARM Note: needs patch to work on a RISC PC65Host available fromherePcr1365Hostpatch6502Em   6502Emis written entirely in ARM code by Mike and Anne Borcherds, and is publishedby Warm Silence Software.Rather than just emulate one of the BBC models, 6502Em can emulate theElectron, BBC model A, B, Master and Master Compact, (but not the originalAtom) provided that is you can get hold of the system ROMs for each system.65Host is distributed with the package, and it is a simple matter to runa program and extract the BBC B ROMs to be able to run 6502Em.A small BASIC program is also provided to be run on the other originalsystems, and will save their ROMs to disk, to be copied to within 6502Em.6502Em is a much better quality emulator than 65Host, and can emulatenearly all aspects of the original hardware, and is probably as good aBBC emulation as there'll ever be. The classics such as Elite canall be run on it fine, indeed the purpose box in the information windowreads, "purpose: to play elite", and it's true! 6502Em is ofcourse fully StrongARM compatible.The emulator can be bought for £15 (or a discount if you buy it with Z80Em), and WSS will also supply a tapeinterface and hardware to allow software to be more easily copied acrossfrom the BBC to the Acorn. 6502Em has recently been updated and relaunched by the author, Michael Borcherds. It's now available directly from him and is Iyonix PC compatible; but due to licensing issues is no longer provided with any ROM images. (David Bradforth) 6502EmSpeed Rating: ARM3 ARM 6 ARM 7 StrongARM6502Empage6502Emonline manualBeebIt   MichaelFoot's BeebIt emulator of the 32K BBC Model B is the first fully freewareBBC emulator for the Acorn. Although 65Host was widely distributed it wasstill copyright Acorn and was by no means perfect in its compatibility.6502Em, though a very good emulator was unfortunately commercial so BeebIthas to be the people's champion as far as BBC emulators go for the RISC OSmachine.Unfortunately the people's champion can't really cut it with the othertwo as far as speed's concerned, and it's not surprising really, sincewhile both 65Host and 6502Em are written in highly optimised ARM assembly,BeebIt has been written in C. Some of the original code was based on DavidDevenport's BeebInC emulator for the PC, but all the old code has now beenremoved and updated by Mike. The emulator is just about usable but coulddo with a lot more optimisations, so if you don't own a StrongARM it'sprobably not worth it. On a StrongARM BeebIt now runs faster than the originalBeeb and will be needing a speed limiter for future versions.With the latest release there have been a couple of bugfixes to thingslike the SBC opcode, and the sideways RAM, keyboard handling, interrupts,and with various other improvements many popular games such as Exile, Skirmish,Psycastria, Strykers Run work correctly and others like Rev are nearlythere. Interlaced frames are now also supported which provides a slightspeed up on lower end machines but affects the clarity of the display.The screen plotting routines have been rewritten in assembly for addedspeed, as well as the odd instruction opcode (such as JSR). Things areimproving quickly now with simple things like fixing it so that Econetdetection returns disabled now allows Dr. Who and the Mines of Terror torun. Mike is now turning to adding sound emulation to the emulator thoughas any emu author knows this is a difficult and complex part of the codingand something which will take a while to be adequate for release. If thingscontinue at this pace a much more compatible and very usable free emulatorthat can compete (for StrongARM owners at least) with 6502Em may be onthe cards.BeebIt v0.05 (31 May 1999) Speed Rating: ARM3  ARM 6  ARM 7 StrongARM |
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