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PC- Eighty Phil Cohen Looks at an Australian Product Which Allows MS-DOS-Based Machines to Run CP/M

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SCREENTEST PC- Eighty Phil Cohen looks at an Australian product which allows MS-DOS-based machines to run CP/M. Sounds strange? Read on .. Remember CP/M? It started way back escort agency management? stock car onto your PC? That's not so easy - when microcomputers were the domain racing?) someone out there has written a especially since there are all those hun­ of boffins only, and the only people that package to run it under CP/M. dreds of different CP/M disk formats. used them in an office were Fora good number of years I owned an But only recently an Australian com­ futurologists. CP/M was developed, like Apple 11+ computer which, by dint of pany called FBN Software has developed a lot of operating systems in those days, having a special card fitted, could run a package that comes complete with a by a lone designer to fill a need of his CP/M. In the fast-moving world of mic­ V20, which solves the whole sticky pro­ own. It grew in size, complexity and rocomputing, what surprised me more blem in one hit. The package is called PC- following from that point on, to provide than anything else wasthe fact that, once Eighty. the basic ideas, and a lot of the traditoins, you had an application, (mine was word that led to MS-DOS. processing) up and running, there was CP/M also gained a solid reputation precious little reason for upgrading to a Installation for user-unfriendliness. Error messages bigger or better machine. Once I was The PC-Eighty package contains a disk like'BDOS Erroron A:' abound. Tocopy a happy with all of the printer formats, with the software, a 30-page manual and file from one disk to another in a single standard files and backup procedures I a V20 chip in its own plastic container. floppy machine, you had to load the file had set up, I could see no reason to The first thing you have to do (after hav­ into memory using the debugger, at the change. Until the IBM PC and MS-DOS ing backed up the software, which the same time noting on a piece of paper the came along.Then I bought a clone. manual wisely tells you to do first) is to size of the file in decimal, then exit the There must be a lot of people who change your CPU. debugger, convert the number to hex, have old CP/M machines running old Now, for those of you who have never put the other disk in, enter the first two applications, who would dearly like to removed a 40-pin 1C from its socket and digits, (I think) in a command like SAVE upgrade to MS-DOS but couldn't face replaced it with another, I can tell you 99 FILE, cross your fingers and whistle the difficult period of adjustment. I was that it is not particularly easy. the national anthem. lucky - as most of what I write is Throughout the whole process you will Although the early versions of CP/M published and then forgotten, I didn't be conscious of the fact that you are per­ (running on 8 in floppies only) were have to worry about porting files from the forming, (literally) open-heart surgery on interchangeable, later versions (for 5 in Apple to the clone. But for other your PC. In order to do this, you must systems) were totally incomprehensible applications- in particular databases andreally want to run CP/M software, or to each other. There are literally hun­ vertical market software - it would write reviews like this one. The process dreds of different disk formats for CP/M, definitely be easier to just keep the old involves covering a table with aluminium almost as many versions as there are workhorse running. foil and grounding it to a water tap. machines. Even on the same machine, For a while now the NEC V20 chip has Always, by the way, use the cold water different versions of CP/M worked in dif­ been available. This is a clever little tap for this the hot tap might not be ferent ways, and it wasn't unusual to device which is plug-compatible with the earthed. have to call in a programmer to get even 8088 (there's also a version called the It also involves a very tricky bit of the most commercial of packages run­ V30 which is compatible with the manoeuvering with a small screwdriver ning. As a standard, CP/M was a 8086). It runs 8088 code without a in a confined space, plus gently bending failure. hitch - in fact, there's one in my clone 20 pins at a time of an expensive 1C so But for all that, it attracted the growing now, as I write this article under MS- that they would fit a socket. However, number of backroom boys and girls who DOS. But as well as being an 8088, the once accomplished, you need never tac­ were interested enough in computers to V20 is also an 8080 - the processor that kle it again. prefer an operating system that made runs CP/M. In fact, there is a possibility that unbe­ you think. Why Intel didn't do this in the first known to you, your PC already contains a Out of those years of fertile CP/M soil place (now that NEC has shown that it's V20 chip. Alternativley, it may contain an and equally fertile minds came an enor­ possible) is a mystery to me. I suppose it 8086, which means that you need a V30 mous outpouring of software to suit the wanted to cut the knot from the 8080 in instead. I suggest that you find this out most vertical of vertical markets. CP/M order to clear the way for the 80286, before you start taking the chip out. software must be almost as varied as 80386 et al. Anyway, by gingerly taking Especially since, if your PC does have an Apple software (of which there is an the 8080 out of your machine and 8086 you will have to buy your own awful lot) - and of course by adding a replacing it with a V20 you can convert V30, as FBN does not supply them. board to the Apple you could run CP/M your MS-DOS-only PC into an MS-DOS (They will, however, give you a refund on on it too! and CP/M machine. that unwanted V20 - I think they're The upshot of all of this is that So far, so good. But what about worth about $20 each). whatever your application (beekeeping? actually getting that old CP/M software Of course, if you have an AT- Australian Personal Computer Page 1 13 SCREENTEST compatible you might as well forget the FDCopy Version 1.0b whole thing, because no-one has pro­ Copyright (c) 1986 FBN Software, Australia duced an equivalent to the V20 for the 80286 chip. CP/M Disk Formats Supported: (Page 1 of 7) Running 1 PC-Eighty Format SS 14 AMPRO (type 1) SS (96 TPI) 2 PC-Eighty Format DS 1 5 AMPRO (type 1) DS (96 TPI) CP/M software 3 Abacus DS (96 TPI) 16 AMPRO (type 2) SS Flaving installed the hardware (ie, your 4 Actrix AM SS 1 7 AMPRO (type 2) DS new CPU), you then have to install the 5 Actrix AM DS 1 8 AMPRO (type 2) SS (96 TPI) software. Now, this is not as simple as it 6 ADDS Multivision DS 1 9 AMPRO (type 2) DS (96 TPI) sounds, particularly if you do not have a 7 Adler Alphatronic P3 20 Amstrad CPC 464 SS CP/M machine and a copy of CP/M itself DS (96 TPI) 21 AMUST Exeuctive handy. I found this out when I first tried 8 Adler Alphatronic DS (Early) DS (96 TPI) togetthe product working. When I came 9 Adler Alphatronic SS 22 AMUST Executive DS (96 TPI) to the part in the manual that said "if you 10 Adler TA/ScreenTyper DS 23 Archive DS do not have [CP/M saved as a file] you 1 1 Altos DS (96 TPI) 24 Archive DS (96 TPI) can generate one on your eight bit 12 AM PRO (type 1) SS 25 Associate DS machine ..." I suddenly realised that I 13 AM PRO (type 1) DS 26 Avatar TCI 0 DS needed a CP/M machine to get the pro­ Use Function Keys to select new page ± or enter number of required duct to work. format: So before you buy PC-Eighty, make sure you have access to a CP/M machine The FDCOPY utility supports nearly 200 CP/M disk formats. and a copy of CP/M that both fit the CP/ M software you want to run. I asked C> someone at FBN why they didn't just C> supply a copy of CP/M with PC-Eighty C >cd\pc80 and they said that Digital Research, the holder of the CP/M copyright, wanted a C >pc80 lot of money for it. Seems reasonable - but be warned that you need that CP/ PC-Eighty version 1.0b M machine. Copyright (c) 1 986, FBN Software, Australia Flaving got your hands on the CP/M machine, you have to do some real old- CP/M Version 2.2 fashioned CP/M jiggery-pokery to get Copyright (c) 1979, Digital Research Corp CP/M onto a file. Flaving done that, you load onto your MS-DOS machine a piece CPU Type: NEC uPD701 08 (V20) Floppy Disk — Drive A; 320K of software called FDCOPY, supplied RAM Disk — Drive B: 51 2K with PC-Eighty, which lets your MS-DOS Terminal Emulation: Lear Siegler ADM31 machine read any of a couple of hundred different CP/M disk formats.
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