test-drb

test-drb@ccmp.vtda.org

101090 discussions

by dlormand＠aztec.asu.edu

>And it was more than just the machine itself, but the culture that >spawned around it. The culture I am referring to mainly is the BBS >culture with all its lingo, the pirate groups who banded together and >cracked software, the holy wars with other computers. >The history behind the machine is what I am most interested in. What >company built it, what year it came out, what technology it used (its >processor, RAM, etc), what its predecessor and successor were, etc. I >like to know each machines historical perspective. Part of the thrill I have of being a TI junkie is BEING part of that history! The interesting part of the 99/4A is not so much the level of technology involved (although it IS there, relative to other home computers of the period) as the legend of how TI could make a market run with it, strain every nerve in true TI tradition, and then dramatically dump it when the effort finally proves to be too much. And now, I am part of the history of the TI-99/4A too, by perversely supporting it in preference to other (e.g. modern, more capable) platforms. -- ********************************************** * David Ormand *** Southwest 99ers * * dlormand(a)aztec.asu.edu *** Tucson, Arizona * **************************** TMS9900 Lives! *

28 years, 5 months

Lisa's scores

by cerebral＠michianatoday.com

>Files are linked lists of blocks. The sector header of each sector on the >hard disk contains pointers to the previous and next blocks in the file, >along with some other info that I've forgotten >Files may be sparse - the fact that block n exists does not mean that >block n-1 does >Block 0 of each file (I think, maybe block -1) contains the 'file >descriptor' - bascially an i-node. >Negative block numbers are the file allocation map. You can use this to >quickly find any block in the file without following the links.

28 years, 5 months

Help identifying ...

by walgen＠do.isst.fhg.de

Hi, today I got a special german (?) computer. It is a "SIEMENS PC100". But inside there is a board labled "R6500 ADVANCED INTERACTIVE MICROCOMPUTER" it is made by "ROCKLWELL" with a small (thermo?) printer a one-line display. Is this one of the legendary AIM65-Machines?

28 years, 5 months

Archive file formats (RE: Archiving Stuff)

by sinasohn＠crl.com

At 06:47 PM 6/25/97 -0700, you wrote: >I'm not so sure that "everything" supports TIFF. After a little looking, >I couldn't even find a TIFF file to test with xv. And my experience has been that TIFF is not always the same, especially Mac vs. PC. >Is there a reason that postscript cannot be used? Most of the schematics >out there that I have seen have been postscript files. [...] >Why not use postscript for publishing the formatted documents? Postscript is fine for Macs, not so great for PC's, and probably unusable for most older (pre-pc) machines. I'm not so worried about the images, but the formatted text should be kept readable. I'm not super-familiar with RTF, but isn't it just tags (like HTML)? If so, than a "reader"(?) could be written, even for CP/M or TRS-DOS or whatever... --------------------------------------------------------------------- O- Uncle Roger "There is pleasure pure in being mad sinasohn(a)crl.com that none but madmen know." Roger Louis Sinasohn & Associates San Francisco, California http://www.crl.com/~sinasohn/

28 years, 5 months

atari800xl FOUND it!

by thedm＠sunflower.com

Monitor Jack (all but 400, North American 600XL, XE Game System): 3 1 5 4 2 1. Composite Luminance (not on North American 600XL's) 2. Ground 3. Audio Output 4. Composite Video 5. Composite Chroma (not on 800XL,1200XL; grounded on 600XL) ---------- > From: Bill Girnius <thedm(a)sunflower.com> > To: Discussion re-collecting of classic computers <classiccmp(a)u.washington.edu> > Subject: atari800xl > Date: Thursday, June 26, 1997 10:39 AM > > anyone know the video pinouts so I can build a cable for this? i just > learned it has a video output.

28 years, 5 months

atari800xl

by thedm＠sunflower.com

anyone know the video pinouts so I can build a cable for this? i just learned it has a video output.

28 years, 5 months

TRS-80 Model I info (RE: MSX, TRS-80, Colour Genie, etc.)

by allisonp＠world.std.com

> >The Basic was an 4k microsoft basic with floating point and simple = > >arrays but no alphanumeric operators or transcendental functions. > =20 > >Tiny basic was an integer language of less than 4k. =20 > > IIRC Level I Basic was floating point but it was not a Microsoft = > product. Only Level II Basic came from Microsoft. In fact the source = > for Level I Basic was later released and I think I have a copy of it in = > storage somewhere. I pulled my notebooks from 76/77/78 and yes RS called it Tiny but, is was not. Tiny basic was the generic name given to ALL integer basics. At the time the only source available basic that was floating point was LLLbasic (lawence livermore labs) which as 8080 code fit in 5k of rom. I suspected at the time it could be a z80 recode for space, no match. Of the tiny basics palo alto TB (1976) was well known and fit in 2k of rom without IO drivers. It didn't match L1. My files indicate that the basic was most closely that of MITS altair basic 4k (pre- MS) by gates/allen. Techically is was not MS. It was at least looking at my notebook significantly identical. That particular basic was an early lost one and after about 79-80 its not seen in MSbasic docs. I suspect it was due to it being pre MS and having allens hand in it. FYI mits 4k basic was small enough to fit in 4k of ram and still hold the video and keyboard drivers. Allison

28 years, 5 months

TRS-80 Model I info (RE: MSX, TRS-80, Colour Genie, etc.)

by allisonp＠world.std.com

> Level I BASIC was _NOT_ a Microsoft BASIC. It was a fairly straight > rendition of Tiny BASIC. Unless I've been lied to for many years. The > Tiny BASIC published in Interface Age did have floating point, though not > much precision. You were lied to. ;-) I have the IA articles for TB and TBX along with DDJ and BYTE. tiny basic was integer. There were several small basics that fit in 4k that were not like L1 (different mix of capability) or were MS 4k clones. Technically it was MS4k. I'd used the altair version and the TRS80 and they were Identical! > The keybounce was a bug in the hardware. Mine always came back when I > turned the keyboard upside down and dumped out a few months worth of > cigarette ashes. A week later the problem would go away. (Proof that I > didn't grow up in a clean-room computer environment -- I was 23 and out > of the USAF when I got that Mod I in '78). Wrong. I was doing systems design for a terminal company while at RS(i was not in sales). That terminal company used the exact same keyboard. Switches bounce, debounce is simple you detect closure wait a few MS and verify closure if the verify fails the switc is open. The 4k basic didn't wait long enough but, beniding the contacts to change their dynamics was often enough. The verification if this is I clocked off a pulse gen and at 1.15mhz the bounce would go away! The delay rountine was in software so slowing the cpu was enough to make the dely longer and it would behave. some of the speed mods made it worsse unless LII was in there. I still have my trs80 hackboard (much modified and mangled) that I used to test various and sundry ideas. Of course when Tandy has launched the trs80 I'd had my altair up and running for some time with a TTY, ct1024 (64x16 upper only) and PR40 printer for a while. Allison

28 years, 5 months

TRS-80 Model I info (RE: MSX, TRS-80, Colour Genie, etc.)

by allisonp＠world.std.com

> > modifications), and power supply brick. Level I BASIC is similar to > > Tiny BASIC. I still have my Level I BASIC reference manual. > > Level I BASIC _was_ Tiny BASIC. NO IT WAS NOT. LEVEL-I basic was the same basic sold by gates for the altair just a later revision level. IT was little, it ws limited but to did have floating point math and a few otehr things not found in tiny basics of the time. Tiny BASIC was one of several basics that were integer math only and far more limited and generally smaller too. Once upon a time there were three basics from MS, 4k, 8k, 12k extended, disk (~23k), and compiled(bascom). L1 was 4k and LII was the 12k extended with mods. > Dennis Kitsz did once publish an upgrade to 48k that could be done in a > keyboard without the EI. I have no idea how many others built it, but I > never had a problem with the alleged memory speed problems from the EI > cable. Jerry Pournelle's gripes are another story. It was never memory speed it was ras/mux/cas timing that was marginal. after about late 79 the design was substantually changed to derive the signals loacally in the EI. stacking 32k more in the keyboard was a trivial task. IF you didn't mind staking the chips three high and skywiring the cas/ lines for the added chips to a decoder. It did work well. > > - RS-232 interface board > For expansion interface. > > Worked better than an Apple serial card from the era. The RS card worked excellent if the connector did! > I _still_ don't understand that trade-off between cost and utility. The > decision makers were gone before I joined the company in '80. INthe trs 80 case some of it was the lack of decision making by other than marketing/sales types. I was there from 74-79 and helped launch and fix the trs80 > > It was more reliable than the cassette interfaces for the Apple or the Pe > ot the Atari. _All_ cassette interfaces are unreliable. How many people Generally speaking all audio cassette interfaces were poor. Some were poorer than others. I'd tried digital (saturation recording) using a modified trs80(all the analog gone) and it was absolutely reliable. The recorder electronics were no more complicated than athe audio just different. > more than a few eval and review units when Tandy announced the TRS-80 > Microcomputer System on 3 Aug 77 with 5,000 units already in the > warehouses -- idea was, since they didn't know if it would work, they had > 5,000 stores -- if the silly things didn't move they'd figure out a way The first year of sales exceeded 250,000! > The one Percom used came out after the design was final. The percom design existed at least a year before the design was started. It was straight out of the wd1771 data sheet!

28 years, 5 months

MSX, TRS-80, Colour Genie, etc.

by walgen＠do.isst.fhg.de

---------- From: Cord Coslor[SMTP:coslor@pscosf.peru.edu] Reply To: classiccmp(a)u.washington.edu Sent: Thursday, June 26, 1997 2:50 PM To: Discussion re-collecting of classic computers Subject: MSX, TRS-80, Colour Genie, etc. > I am located in central Nebraska, USA, and am looking for the following to > add to my collection. If you have these systems or might be able to get > them for me at a reasonable price, PLEASE e-mail me. > > MSX computer > Colour Genie > TI 99/4a I have a Colour Genie and a Sony HitBit HB75 and also a Ti99/4A as I live in germany sending the TI99/4A makes no sense but if you are interested in the other items drop me a note. I would like to swap them on a "I send them to you and pay on my own and you send me some other stuff and pay for the shipping". What do you think? Here my URL for some other stuff I have to trade: http://192.102.161.122/~walgen/

28 years, 5 months

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