test-drb September 2002

test-drb@ccmp.vtda.org

217 participants
408 discussions

Archival storage (was RE: OT: dumpster dive and water/mold cleanu p)

by Robert_Feldman＠jdedwards.com

Look for companies that sell conservation (as in museum storage) supplies. Some that I know of are Gaylord Brothers, Light Impressions, and Hollinger Corp. They sell acid free (buffered) and inert materials for storing documents, photos, textiles, etc. You might also go to a building supply company and get a roll or Tyvek building wrap and make your own sleeves. More or less the same stuff used for 51/4 inch floppy disk sleeves. Only problem might be you would need to use an archival glue or tape to hold the sleeves together. -----Original Message----- From: Tothwolf [mailto:tothwolf@concentric.net] Sent: Wednesday, September 04, 2002 1:57 AM To: cctalk(a)classiccmp.org Subject: RE: OT: dumpster dive and water/mold cleanup On Wed, 4 Sep 2002, Russ Blakeman wrote: > I've made sleeve from the vinyl you can buy in rolls from Walmart for > putting over leaky windows - it's pliable and thinck and similar to the > vinyl that our "forefathers" (and foremothers) used to cover their > furniture with, but thinner. Fold it and then heat seal the top and > bottom edges. I've seen forsted vinyl sleeves lik that in years past > that came with an odd sized box that they could be stored in, sort of an > archival manner of storage. I'd be worried about the PH of such material. Highly acidic (or even highly alkaline) materials are the enemy of items you wish to preserve. -Toth

21 years, 8 months

TI Silent 700's: Update

by doc＠mdrconsult.com

OK. A little looking around has revealed that I have a Model 707 (not the 707/1200, darn it!) and a model 745. I also found out this evening that $friend forgot to give me the shopping bag full of thermal paper.... I've found a lot of links to pages that mention there, but no real documentation. Oh, and one company that will sell a manual for the 745 for $30 plus S&H. Does anyone know where I might find real information? Considering the source, I have every hope that they are fully functional. Doc

21 years, 8 months

OT: dumpster dive and water/mold cleanup

by mythtech＠mac.com

>A reality show? Do you mean non-fantasy? yes, sorry, bad wording on my part. -chris <http://www.mythtech.net>

21 years, 8 months

Semi-OT CP/M question/ feasibility

by archer＠topnow.com

I figure anything CP/M is on-topic, but the hardware I'm talking about would be brand new. :) Are there working examples of CP/M running with just a serial terminal connection and a drive+interface for the sum total I/O? I'm assuming this has been done many times and in theory would be nothing too offbeat? If this exists, it might be useful to study the BIOS to see what's being done there, or perhaps just buy the board and CP/M if by chance something's out there already. Are you giving up anything important with a terminal-based CP/M system vs. one with integral monitor and keyboard -- in other words, cursor positioning and such in applications being less flexible? I'm assuming the answer is "no", no difference because of the way CP/M BDOS calls all go through BIOS? Or is this a "in theory X in practice Y" thing? The reason I'm asking is I've FINALLY -- after about two months of struggle with hardware and coding -- succeeded in getting my IDE interface working. Although it's currently mated to a 6502 board and a 60GB HDD, since it's based on an 82C55, could just as easily be coded to work with a Z80/Z180 system. Okay, I know that porting a BIOS to a new board would be massively non-trivial. I've got a good book "Programmer's Guide to Using and Modifying CP/M" (IIRC) which makes it clear it would be a fairly good prospect to take months to finish, even with good debugging practices. (Although I'm no stranger to coding moderate-sized assembly programs.) On the other hand, I'd motivated by having an SBC that could run any of a number of C, Pascal, Modula 2 or Fortran compilers, along with BASIC, decent editing tools (well, I cut my teeth on PC-DOS Wordstar!), would make such an SBC really quite nifty as a hacking toy. Comments? I'm thinking of using a GAL decoder to map 32Kx8 of "shadow" EEPROM to MEMRDs and the "shadow" RAM to the same address for MEMWRs upon RESET, then copy the "shadow" ROM to RAM on coldboot, and then write to an I/O port to cause the GAL to map only the 128Kx8 SRAM into the machine memory map and jump to 0 to bootstrap up. Not sure if BIOS could use the upper 64K bank for storage in a useful way like disk I/O buffering, but since 128Kx8 SRAMs are cheap and small, and I've got a tubefull, that's what I'd want to use. :) P.S.: I got the 360K floppy to work under Win98, but not XP. I suspect it's just an undocumented "feature" of XP. :)

21 years, 8 months

Intersil Intercept Jr (was Re: Blowing Up Old Computers( early laptops))

by healyzh＠aracnet.com

You might want to check out the following project if you want to build your own small PDP-8. David Conroy has implemented a PDP-8i in an FPGA. http://surfin.spies.com/~dgc/pdp8x/ I might have some info on the 6100, I'll have to try and remember. I've got databooks from them and I believe Harris that list it. Zane > > I think it used unobtainium type RAM and ROM, being > all early Intersil CMOS, so it might be very difficult > to make an "authentic" one today even if you had a > 6100. The 6100 was, given my limited knowledge, harder > to make truly PDP8/e compatible than the later 6120. > I've looked around for a ROM listing or front panel > code for the 6100/Intercept with no luck. > > > > > --- "Peter C. Wallace" <pcw(a)mesanet.com> wrote: > > On Tue, 3 Sep 2002, Ethan Dicks wrote: > > > > > > > > --- Mike <dogas(a)bellsouth.net> wrote: > > > > > > > > I just had to nominate the Intersil Intercept > > Jr. to the early laptop > > > > catagory, Runs on batteries, fits in a lap. > > > > > > > > ;) - Mike: dogas(a)bellsouth.net > > > > > > Are there plans out there anywhere? I doubt I'll > > ever run across > > > a real one. They looked kinda cool back when I > > was a kid, but at > > > the time, I didn't understand what it meant to be > > PDP-8-instruction- > > > set compatible (i.e., the implications of it, not > > the literal sense > > > of "compatible"). > > > > > > It had, IIRC, some toggle switches, LEDs, and 4KW > > of SRAM, right? > > > > > > -ethan > > > > The intercept had those, the Intercept Jr only had a > > keypad and numeric LED > > display. It only 256 or 1K (12 bit) words of RAM > > ISTR > > > > > > > > > > > > > > > > > > > > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Yahoo! Finance - Get real-time stock quotes > > > http://finance.yahoo.com > > > > > > > Peter Wallace > > > > > __________________________________________________ > Do You Yahoo!? > Yahoo! Finance - Get real-time stock quotes > http://finance.yahoo.com >

21 years, 8 months

Intersil Intercept Jr

by mranalog＠attbi.com

Loboyko Steve wrote: > I think it used unobtainium type RAM and ROM, being > all early Intersil CMOS, so it might be very difficult > to make an "authentic" one today even if you had a > 6100. On mine, the motherboard uses a IM6312 for the "microinterpreter" (dated mid 1977). And I assume that the three IM6561s are ram chips (dated early 1978). The rest consists of: 1 - IM6100 2 - CD4511 1 - CD4042 1 - F4075 2 - 74C74 1 - F40175 1 - CD4025 2 - F40098 1 - 74C42 1 - CD4069 1 - CD4011 1 - F4001 1 - 1K Beckman DIP Resistor pak 1 - 10K Beckman DIP Resistor pak 8 - FND 367 7 segment red LED displays 1 - 2.4576 MHz crystal 1 - 12 key keypad 4 - 2N2222 transistors 3 - 44 pin circuit edge connectors 1 - battery holder to hold 4 D cell batteries in series and a few resistors, diodes, capactors and a switch Now the "6951c-M1KX12" plug-in battery-backuped ram board has 12 IM6518s. > I've looked around for a ROM listing or front panel > code for the 6100/Intercept with no luck. Somewhere here I have the users manual and I am almost certain that there is a listing of the microinterpreter in the manual. Regards, --Doug ========================================= Doug Coward @ home in Poulsbo, WA Analog Computer Online Museum and History Center http://dcoward.best.vwh.net/analog Analogrechner, calculateur analogique, calcolatore analogico, analoogrekenaar, komputer analogowy, analog bilgisayar, kampiutere ghiyasi, analoge computer. =========================================

21 years, 8 months

OT: dumpster dive and water/mold cleanup

by mythtech＠mac.com

>Home recorded?? I didn't know that was possible! The only time I ever actually saw a record recorder was on an episode of the Honeymooners. Ralph recorded a message for Alice on his record player. He made a comment about needing a blank record, and then spoke into what looked like a mini horn speaker. I assumed that since the Honeymooners was a "reality" show, that the device actually existed (and since I have heard reference to such a thing elsewhere). Anyone know what material the blank records used? I would think ceramic would be too hard, and even vinyl records seem like the material would be too stiff to get a good recording. -chris <http://www.mythtech.net>

21 years, 8 months

OT: dumpster dive and water/mold cleanup

by mythtech＠mac.com

>I've never heard of ceramic records. Is this different than the old >bakelite reocrds? Don't know. I'm not a record expert, so maybe they aren't ceramic. I was told that was the material, and I know they are a hard, brittle, fragile glass or clay like substance (from the one that I broke). These are 1910-1920 era records (based on the fact that they carry the Victrola name, and IIRC, my Victrola has a 1913 date on the back) -chris <http://www.mythtech.net>

21 years, 8 months

some observations

by ghldbrd＠ccp.com

It has been some time since the OT rants took up the majority of e-mails, and now we get the spammers in the list . . . . I've noticed that I get upwards of 100 e-mails a day from you guys. Much of it gets disposed of if I have no interest, but on occasion I pick up some nice tidbits of information for future reference. What I've seen is multiple listings from the same person, who writes and sends, writes and sends, a sentence or two at a time. Sometimes I think one would be better off if one just sat back and composed a single post with all the details in one fell swoop. I'm sorry if this may have offended someone; it was not intended to. Just some biased observations and a suggestion to help cut down on some of the unneeded traffic. You all have a wonderful treasure of knowlege out there, just make the nuggets a bit bigger . . . please???? Gary Hildebrand St. Joseph, MO

21 years, 8 months

OT: dumpster dive and water/mold cleanup

by mythtech＠mac.com

>Are you thinking of 45s? I've never heard of storing fragile 78s in wire >racks... I have some ceramic 78's stored in wire racks. They go to my Victrola. I confiscated them that way from my father (when I repaired the Victrola many years ago), but I remember growing up they were always stored that way in the basement. I can't say however if my father put them that way, or if he got them that way from my grandmother when he confiscated the Victrola from her (with intention of repairing it, but he didn't, instead it sat in the foyer for 15 years before I decided to see if I could get it going). I haven't dared change their storage method simply because I am afraid of breaking them, and I figure if they have made it about 30 years this way, they should be able to make it another 30. -chris <http://www.mythtech.net>

21 years, 8 months

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test-drb September 2002