test-drb January 2009

test-drb@ccmp.vtda.org

218 participants
340 discussions

by jgessling＠yahoo.com

Thanks to all for your help. Indeed the schematic is on the cardboard. I've made a LTspice model of it and am trying to understand but I'm just a software guy trying to learn. I've had an offer for the datasheet and followed up on that. BTW, I bought the 150-1 a couple years ago at a flea market for maybe $5. Box is quite worn but inside it had never been used and now that I've got some time I've dived into it. Jim

15 years, 11 months

Annals of the History of Computing: "bitsavers" is referenced

by eric940＠gmail.com

Journal issue: 2008, Volume 30, Issue 3 Article: "The Genesis of the Tenet 210: An Early Time-Sharing System" (page 81, specifically) Reference: http://bitsavers.org/pdf/tenet There's no citation/footnote mentioning the supplier of said link/resource. Admittedly, 'tis nice that such a reputable publication (IMHO) references this valuable resource, but would it not be appropriate to notate the source of the author's material (of which I found none)? Or would this bring unwanted attention to the potential copyright issue(s) of the material in question -- which I recall being brought up in an eBay thread of similar nature a week or so back (and what spurred me to comment on this)? While this journal may not have a [relatively] huge circulation (I think - just a guess), it could prove taxing to the bandwidth resources from the host referenced. (This message could prove moot if the provider of the resource was, indeed, contacted by the author before publication of the article.)

15 years, 11 months

Recommendations for IMSAI-compatible RAM cards?

by derschjo＠mail.msu.edu

Hey all -- Acquired an IMSAI 8080 in half-assembled condition (but the price was right). I believe that (after doing some thorough cleaning, debugging, and replacing of old cabling) that I've got the front panel and CPU functioning correctly. However, the IMSAI came without any RAM cards so I'm unable to go any further at the moment. I have one S-100 RAM card but I have no documentation on it and it's missing a couple of ICs (and what they're supposed to be, I don't know). It's a PSS RAM65. My internet searches for info confirm that the card does indeed exist, but I can find no technical information. From my research, my understanding is that S-100 RAM cards are fickle and compatibility with front-panel machines can be an issue. Does anyone have any recommendations for what to look out for as I begin my search? Anyone have any decent RAM cards they'd be willing to part with? Thanks! Josh

15 years, 11 months

Can a TU80 read 800bpi tapes?

by bqt＠softjar.se

B M <iamvirtual at gmail.com> wrote: > Can a DEC TU80 tape drive (a 1600bpi device) read 800bpi tapes? The > goal is to archive several 9-track tapes I have. The tapes were > originally for a PDP-11 system, but I do not know the original tape > format (RT? RSTS? DOS? ...). No. The TU80 is 1600 bpi only. Johnny -- Johnny Billquist || "I'm on a bus || on a psychedelic trip email: bqt at softjar.se || Reading murder books pdp is alive! || tryin' to stay hip" - B. Idol

15 years, 11 months

Anyone have Heathkit catalogs from the late 60's/early 70's -- looking for electronic experimenter

by ragooman＠comcast.net

I was hoping to find someone with Heathkit catalogs from the late 60's-early 70's. I'm trying to track down an electronic experimenter which I used as a kid. I don't have a pic or model #, just have a visual in my memory--I should draw this from memory, maybe someone can recall this. Basically, it contained two consoles of blue plastic and a white 'lego' style breadboard and red component bricks. If someone has a catalog, I would like to ask about scanning the page with the description and image of this. thanks =Dan -- [ = http://www2.applegate.org/~ragooman/ ]

15 years, 11 months

TRS-80 Model 1 vs Model III disk/application compatibility question

by ethan.dicks＠gmail.com

Hi, all, I was cleaning up around the house and wanted to stash a Model 3 on the shelf out of the way. Before I did, I fired it up to make sure it (still) worked, and to try something I haven't tried before... I have diskettes, c. 1982, from a friend lying around, so I booted it into TRSDOS 1.3. All seems well. It claims to have 48K (internally and according to the markings of the case and the memory report at boot time), passes MEMTEST (which is on most/all of the TRSDOS disks), it runs BASIC, and it starts a couple of binary games I found. What it does not do is run Zork or Enchanter. I have original Zork I and Enchanter disks. Booting up a backup of the Zork disk gets me to a TRSDOS prompt. I can take a DIR and see the program and the data file there. If I start Zork, the screen blanks, the disk gronks and the access light blinks occasionally. I hear what sounds like successive track seeks (which I'm expecting since I know how Z-Machines work and roughly what virtual pages need to be loaded to get a game started), but then after a few seconds (less than 2 min), it sounds and looks like it's in a loop and repeats the gronking and flashing. I never see anything on the screen except for a blinking cursor. The Enchanter disk isn't much better - I think it spins the disk and gronks for a bit, then goes quiet. I'm posting because I am reasonably certain, due to age if nothing else, that these are Model 1 diskettes. Enchanter is a flippy, with an original Infocom label on both sides marked "side 1" and "side 2". The Zork disk is a Personal Software release (I have the 8.5"x11" manual, too, naturally), thus about as old as it gets for Infocom products. I don't recall when the III came out, but Enchanter is one of the older titles, along with Starcross and Zork, so sometime around 1982. The dates in the directory for the Zork disk are also 1982 (prior to the most commonly available release of the gamefile from 1983). The part I'm not sure of is if there would be any gotchas trying to run software from 1981-1982 on a Model III or not. Of course I can play these games on a variety of systems I have on hand. I'm just trying to get this to start up to check gamefile version numbers and to take a few turns at 27-year-old-machine speeds. It's possible I have two different defective game disks, but it's also likely that I'm attempting something out of naivete that a die-hard TRS-80 user would immediately recognize as futile. Thanks for any tips, -ethan

15 years, 11 months

ping for Jim Davis

by chrism3667＠yahoo.com

Jim if you're still on this list, please e-mail me w/your current e-mail address. Thanks.

15 years, 11 months

Can a TU80 read 800bpi tapes?

by iamvirtual＠gmail.com

Can a DEC TU80 tape drive (a 1600bpi device) read 800bpi tapes? The goal is to archive several 9-track tapes I have. The tapes were originally for a PDP-11 system, but I do not know the original tape format (RT? RSTS? DOS? ...). Thanks. --barrym

15 years, 11 months

BA-302 data

by jgessling＠yahoo.com

My radio shack 150 in one electronic project kit (cat number 28-248, maybe 1976?) contains a part listed as an "Integrated Circuit". Model number BA-302 is listed and that's what's on the part. It's a 7 pin inline package. The text mentions it to be a "ring of three" amplifier. I've been having quite a bit of fun working with this kit, never had one as a kid, but this part has me a bit baffled. Internet searches haven't turned up anything useful. Anyone can help? I'd really appreciate it. Thanks, Jim

15 years, 11 months

Recommendations for IMSAI-compatible RAM cards?

by dm561＠torfree.net

Message: 14 Date: Tue, 27 Jan 2009 18:48:42 -0500 From: "Richard A. Cini" <rcini at optonline.net> Subject: Re: Recommendations for IMSAI-compatible RAM cards? On 1/27/09 11:41 AM, "Bill Sudbrink" <wh.sudbrink at verizon.net> wrote: > The Compupro RAM series (RAM16, etc.) do a good job for me. > I agree with this. Over the years, I've collected and replaced my various 8k and 16k cards with all CompuPro RAM16 or RAM17 cards. I've had other good and reliable cards, SSM and Vandenberg cards, but they all use odd and hard to replace RAM chips. The thing I like about the RAM16 and RAM17 is that they use 6116 SRAM chips which are pin-compatible with 2716 EPROMS. So, the board can double as an EPROM board. This is what I have in my IMSAI. Rich -----------------Reply: I've got more 6116-4s than I'll ever use, if anybody needs any. Also some Cromemco 64KZ/IIs. mike

15 years, 11 months

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test-drb January 2009