test-drb January 2003

test-drb@ccmp.vtda.org

388 participants
970 discussions

Updates to the Little Orphan Tomy Tutor site

by spectre＠stockholm.ptloma.edu

Updates have (finally) been made to the Little Orphan Tomy Tutor site. The Little Orphan page is devoted to the Texas Instruments' 99 series' close relative, the Tomy Tutor, containing general information, technical documentation, the only currently extant 'simulator' and photographs and type-in programs. Here are the new changes: * Tutti, the Tomy Tutor 'emulator' ('simulator') for the Commodore 64, is now upgraded to 0.3 with the beginnings of GBASIC support and a large number of bug fixes. * Type-in programs are now available, from simple educational examples to crazy hacks (tip of the hat to the Wizard Kludgefinder). * An exhaustive (?) GBASIC reference is now available, with a description of keywords and MONitor commands. * A new page, in progress, comparing the Texas Instruments series with the Tutor is now available. * A new front page tracks modification dates on files for easier navigation. * Additional technical notes on the 9918A(NL) on the hardware page. * Updates to the programming page to include GBASIC comparisons. * Custodial updates to the cartridge list, the Pyuuta page, and various link corrections. The site is located at http://www.floodgap.com/retrobits/tomy/ Please mail me with corrections and comments. -- ----------------------------- personal page: http://www.armory.com/~spectre/ -- Cameron Kaiser, Point Loma Nazarene University * ckaiser(a)stockholm.ptloma.edu -- This signature is free of dihydrogen monoxide! Ban it now! www.dhmo.org ----

22 years, 5 months

Free stuff

by loedman1＠juno.com

The following hard drives were delivered to me yesterday, much to my Wife's dismay, and are looking for homes. All are supposed to function and as far as I know have not been erased (hmmm) Free for the actual shipping cost. (1) Conner CP3000 (2) Seagate ST-125 (3) Maxtor 7213AT (4) Maxtor 7245AT (5) Maxtor LXT340A (6) Maxtor MXT540A (3) (7) Conner CFA340A (8) Seagate ST-225 (2) (9) Seagate ST-238R Also received a bunch of miscellaneous chips and cards that I need to sort and identify that will be available Rich Stephenson

22 years, 5 months

Core memory speeds

by Charles＠socketcom.com

> -----Original Message----- > From: Jos Dreesen / Marian Capel [mailto:jos.mar@bluewin.ch] > Sent: Monday, January 20, 2003 12:10 PM > To: cctalk(a)classiccmp.org > Subject: Re: Core memory speeds > > > On Monday 20 January 2003 12:02 am, ben franchuk wrote: > > Since I am building a classic TTL style computer, > > what was the access and cycle time of core memory > > before it vanished and just when did it do that? > > Also when did 74LS come out? I am aiming for late > > 70's early 80's time frame here since this looks > > to be the transition stage from the the old to > > the new. Ben > > > My 1975 core memory products catalogue ( Philips components ) > lists modules with cycle times ranging from 0.65 to 1.5 us, > both for 8kx18 stacks. > > My newest core memory stack sits in my Philips P856 : > dated 1980, cycle time unknown. > > My own TTL computer, dated 1986, just uses 8kx8 SRAMs...... > > > Jos Dreesen > With core memory the general rule was the smaller the donut the faster the cycle. The real limiting factors have always been the physical size of the array of cores. The plane, a mat of wires with little teeny-tiny ferrite donuts at each intersection, looks electrically like a lot of inductors all strung in series. This is a good configuration for a low pass filter that we are going to put a very fast pulse through. The bottom line of all this is that even fast core memory tends have around 0.490us write cycle times. Read cycles are always twice the write cycle times. This means you need to read the core memory specs carefully. Be sure that you see the both read and write cycle times. If you can only find one it will most likely be the write cycle time.

22 years, 5 months

Intel 8751

by dwightk.elvey＠amd.com

>From: "Philip Pemberton" <philpem(a)dsl.pipex.com> > >Stan Barr wrote: >> While looking for some op-amp chips earlier I came across a >> couple of 8751s (labelled Intel '80). A quick google search >> failed to turn up a data sheet, anyone any ideas where I can >> look? >IIRC, the 8751 is an EPROM (windowed package) version of the 8051 MCU. The >thing about the 8051 (and the 8052) is that it can also be used as a CPU - >add a 74LS573 (or 74LS373) latch and a bit of decoding and you can disable >the internal program memory and use external memory instead. This is the EA pin. It controls where the program memory is. The 8031 ( 8032 ) is the version that is sold to be used this way. As far as I know, the 8031's are just units that the mask part failed or overruns of mask 8051 parts. Early on, 8031's, with EPROMs were more common in keyboards and newer keyboards use just 8051's. Dwight I use >8051-derivatives a fair bit - Atmel's AT89S8252 is a particularly nice >chip - basically an 8052 with 8k of internal FLASH memory and an SPI >programming interface. > >Later. >-- >Phil. >philpem(a)dsl.pipex.com >http://www.philpem.dsl.pipex.com/ > >

22 years, 5 months

Apple 1 schematics

by cb＠mythtech.net

In reading my copy of Collectible Microcomputers (yes yes, you all get it by now, I like the book... ok, I'll stop refering to it after this)... I noticed in the Apple Computer section a mention of how Apple's first customers were the folks that got schematics for the Apple 1 when it was first shown at Home Brew. Although I already knew that they alledgedly gave out schematics... I began to wonder A: did they really (probably) and B: do any copies exist anywhere? I thought it might be a fun project to try an build an Apple 1 from the schematics... just as the first users probably did. So, does anyone know if they are available, or does anyone have a copy and might want to send me a set? Or are copies just as elusive as the Apple 1 itself and there is no shot in ever getting them. -chris <http://www.mythtech.net>

22 years, 5 months

Intel 8751

by dwightk.elvey＠amd.com

>From: "Stan Barr" <stanb(a)dial.pipex.com> > >Hi, > >To get back to computers for a change... > >While looking for some op-amp chips earlier I came across a >couple of 8751s (labelled Intel '80). A quick google search >failed to turn up a data sheet, anyone any ideas where I can >look? > > >-- >Cheers, >Stan Barr stanb(a)dial.pipex.com > >The future was never like this! > > > Hi Stan These are the EPROM version of the 8051's. These can be programmed and used just like the 8031's in keyboards or used in place of a mask ROM 8051, when programmed. I don't recall if Intel published the programming specs for these but there are a lot of programmers that will program these ( often with special adapters :( ). I think Data I/O's don't need anything special other than the 40 pin socket. Look for 8051 family manuals. I think Intel stopped publishing programming specs when they had different flavors of EPROMs with similar names. They wanted to keep the programmer manufactures up to date without worrying about hobbiest blowing their parts up. Dwight

22 years, 5 months

PerSci Model 277 Dual 8" Floppy Drives - Info Needed

by tim.myers＠sunplan.com

Does anyone have any info on these drives? I have some in a CP/M system (Ithaca Intersystems DPS-1), and they seem completely dead. They have an electric load mechanism, but when I insert a disk, nothing happens. Popped the case and can't see anything obviously out of place. Tim.

22 years, 5 months

Intel 8751

by glenslick＠hotmail.com

Is it a 40-pin DIP package? OTP/EPROM version of an 8051. http://developer.intel.com/design/mcs51/cf_51.htm >From: Stan Barr <stanb(a)dial.pipex.com> >While looking for some op-amp chips earlier I came across a >couple of 8751s (labelled Intel '80). A quick google search >failed to turn up a data sheet, anyone any ideas where I can >look? _________________________________________________________________ The new MSN 8 is here: Try it free* for 2 months http://join.msn.com/?page=dept/dialup

22 years, 5 months

Intellectual 'PROPERTY'

by msokolov＠ivan.Harhan.ORG

Stan Barr <stanb(a)dial.pipex.com> wrote: > Of course they're not *really* indigenous, having walked over from > Eastern Asia :-) No, they did not walk over from Eastern Asia. They are descendants of Ka-in who was transported to this continent by helicopter (from E.DIN aka SHU.MER aka Iraq) when the Anunnaki sentenced him to exile for killing Abael. MS P.S. Yes, Ka-in, not Cain. Abael, not Abel. E.DIN, not Eden. SHU.MER, not Sumer. And yes, the Anunnaki ("Those Who from Heaven to Earth Came" in ancient Shumerian), not God. The Bible and the modern "scholars" got it all wrong.

22 years, 5 months

Intellectual "PROPERTY"

by lgwalker＠mts.net

Reading classiccmp today I wanted to puke. I'm sorry, I'm with Stallman, fuck the corporate spin-doctors. In the real world ideas are free and even Bob Dylan was noted for his free use of others material. "Intellectual PROPERTY" ? That's a lawyer's and corporate term. Meaning the extension of material possession law to ideas cause lord knows they've got property rights down to a science. The pharmaceutical companies almost patented the human genone but were prevented by a few alert clinicists. Monsanto is busy trying to tie up our very grain foodstuff, our health is held ransom to the corporations. And some little sucks that hope they can emulate Bill Gates are peddling this game ? Sony, MCA, and the music conglomerates got their "copyrights" by stealing the songs from the musicians and composers for the most part. There's a long history of poor jazz and blues musicians behind all those songs. And even McCartney and Jagger will admit that they copied American blues musicians in what they did. These sterling words that the creator of some idea should benefit from his creation are simply bullshit to provide cover for the suits who do benefit. For the most part they paid a (barely) living wage to the artists who did actually do the creative part, whether songster, cartoonist, writer, or coder. Even Edison and his company ripped off Tesla. Damn, what has the impersonality of computers wrought ? A generation of egocentric, alienated, individualists with some sort of subjective morality ? It's OK to do a bad thing if it furthers my objectives ? A world I never made ! GNU forever ! Alt 2600 is looking good if I can just get by the spelling, the ingenuity, and "z" for "s". Get a new suit and eat more. You'll still die eventually. Lawrence Live life like you're never_gonna-die Love like you've never been hurt Dance and sing like no-one is watcing or listening And rejoice in our creation. lgwalker(a)mts.net bigwalk_ca(a)yahoo.com

22 years, 5 months

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test-drb January 2003