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 ----
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
> -----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.
>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/
>
>
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>
>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
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.
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
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.
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
