--- Aaron Christopher Finney <af-list(a)wfi-inc.com> wrote:
> No extra cable...but I do have the RS422 standard pinout handy...
I've got the pinout of the camera from the Apple tech support web site.
What I was confused about is what signals get wired to what signals for
RS-422. I've been making RS-232 cables for 10 years, but without a cable
diagram, I've never made a Mac cable.
>
> On Sun, 12 Mar 2000, Ethan Dicks wrote:
>
> > So... does anyone out there have a Mac "null-modem" cable they'd like to
> > get rid of?
I've also found out that this *exact* cable (down to the icon) is used to
connect a Newton to a Mac. Any Newt users out there (in the States, Hans ;-)
that have a source for cables?
=====
Even though my old e-mail address is no longer going to
vanish, please note my new public address: erd(a)iname.com
The original webpage address is still going away. The
permanent home is: http://penguincentral.com/
See http://ohio.voyager.net/ for details.
_________________________________________________________
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Hello, fellow scroungers,
After having formatted my system drive in error, I am putting back in my
tape backup unit.
I have gobs of 150 meg and 250 meg tapes, but am in need of 525 meg tapes
----------- DC6525 ---------
for less that retail price (which at last report was $20-30 a pop).
I would appreciate any leads . . . .
Gary Hildebrand
I have been using a Zax in-circuit debugger and it has recently stopped
working. As best as I can tell, the Zax corporation is no longer in
existence. I'd like to either have my unit repaired or find a
replacement. Any help out there?
klager(a)execpc.com
>Are you using a 1.2MB floppy drive to write a 360K floppy disk?
Yes, but I used the drive (1.2Mb) to format it to 360K.
____________________________________________________________
David Vohs, Digital Archaeologist & Computer Historian.
Computer Collection:
"Triumph": Commodore 64C, 1802, 1541, FSD-1, GeoRAM 512, Okimate 20.
"Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II.
"Delorean": TI-99/4A.
"Monolith": Apple Macintosh Portable.
"Spectrum": Tandy Color Computer 3.
"Boombox": Sharp PC-7000.
____________________________________________________________
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Get Your Private, Free Email at http://www.hotmail.com
On Mar 30, 0:17, Olminkhof wrote:
> Anyway, Control C doesn't work and I can no longer repeat getting to an
@
> prompt, instead getting a lot of backward ? characters at times.
> I'm now using the console port but have lost confidence in the terminal
and
> serial cable completely. I discovered the baud setting control for the
ports
> after I blew the dust out of the little window. Set the port to 4800
baud,
> the default setting on the VT220. All for no consistent result. Tried 110
> baud on both with no result
If the system is using the SLUs on the MXV11-B, the little window is
meaningless, as the baud rate etc on the MXV11 has to be set by rejumpering
several links, often with wire wrap. There's no handy way of connecting a
selector switch.
> I switched to a straight though 25 wire serial cable and got absolutely
no
> communication, . . added a null modem and got a little garbage . .
changed
> from the default VT200 mode 7 bit controls to some of the others . . .
all
> to no result.
Try connecting directly to the 10-pin connector on the left side of the
MXV11, start it up, and hit the HALT button. You should get an address and
an ODT prompt. You should get another prompt every time you press RUN, if
HALT is still pressed in. Assuming the panel is connected to the backplane
correctly.
The MXV11-B only supports 300/1200/9600/38400 baud. J9,J10,J11 control the
setting for SLU0, J7,J8,J9 control SLU1 (the console port). 9600 is J9 to
J10, and J8 to J9. J61 to J62 forces SLU1 to be the console.
It's also possible that you have some kind of custom bootstrap in it.
MXV11-Bs were sometimes sold without boot ROMs (the standrd ROM set is
known as the B2 ROM set, and marked as such), and use the same software
arrangement as the MRV11-D ROM board, so people were able to roll their own
using information in the MRV11-D manual.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
On Mar 29, 13:41, Bill Pechter wrote:
> > In article <00ce01bf990a$26953aa0$03e893c3@proteus>, Peter Pachla
> > <peter.pachla(a)wintermute.org.uk> writes
> > I have an external tape drive which I am told came from a Prime of some
> > sort which you can have. I don't know what sort of tape it takes as I
> > didn't get any with it. Perhaps someone else on the list could say
> > whether it is any use to you. It has no external markings except for a
> > sticker showing that it passed statutory testing in 1988. The drive
> > itself is an Exabyte Model EXB 8200, does anyone recognise this?
> It's an 8mm 112M Exabyte... www.exabyte.com. Works great with any
> SCSI single ended (usually) interface.
I have two here, one sold originally as a PDP-11/83 add-on, and one from a
Pr1me. I upgraded the firmware in the older one using code from
www.exabyte.com, and both work very nicely on my Unix machines and an Acorn
Archimedes. They don't do compression and the standard 8200 doesn't have
the high-speed search that the 8200S has, but they handle a reasonable data
rate and hold around 2.2GB per tape. Lots of people use 8mm video tape; I
prefer to use proper data cartridges, though.
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Went the the Hamfest at the Motorola Factory in Plantation (western Ft.
Lauderdale) last weekend. From what I understand, it used to be a regular
event but, now it's held infrequently. There were quite a few sellers there
but, not too much computer stuff.
I found a micro-based controller for $10. Looks like it was used for some
kinda automated inspection or manufacturing system. The system consisted of
4 large wire-wrapped boards and 4 fairly large power supplies. There was
some damage to the innards so, I bought it strictly for the parts. Got a ton
of TTL devices and other goodies out of it.
Also found a "NIDA" Counter / Timer. It's an educational tool used to teach
digital logic. It's in great condition considering it came from the school
board. In my experience, most of the stuff from the schools is pretty beat
up. Anyway, it's very cool and only cost me $5.
I had other comittments so only stayed until 8:00 AM. At that time, sellers
and buyers were still filing in. Probably missed some good stuff but, oh
well...
Later,
Steve Robertson <steverob(a)hotoffice.com>
>
> We stayed at the meet for about an hour or so, and decided
> that we had had
> enough of the wall to wall people. I had fun but I doubt that
> I'll go again,
> unless I learn more about ham radio stuff. I'll hold out for a vintage
> computer fest instead.
>
> Ernest
On Mar 28, 15:25, CLASSICCMP(a)trailing-edge.com wrote:
> >> >M7195
> >>
> >> 128 kbyte RAM
>
> >It's actually a MXV11-B Multifunction card, with 128KB RAM, and ...
>
> >> It's also particularly confusing, because you evidently have no serial
> >> line cards nor disk controllers in the backplane. I have no idea
> >> how you even got the ODT prompt out of the machine.
>
> >... the MXV11-B has two SLUs, of the same type as a DLV11.
>
> Yeah, that makes more sense. I still don't know how his machine is
> supposed to boot from disk without a disk controller, though!
Ah, that's the magic part :-)
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
On Mar 28, 19:14, Tony Duell wrote:
> The other thing is that when 96 tpi drives were in common use, some
(lesser)
> manufactuerers fitted the narrow head to all drives (even 48 tpi ones!).
> Or at least some system builders/OEMs did. I have heard rumours that a
> well-known BBC micro supplier sold 40 track, 80 track, and 40/80
> switchable drives. They were actually all the same (80 track, 96 tpi)
> mechanisms. The '40 track' ones had been modified to double-step, and the
> switchable ones had this mod controlled by the switch.
Canon mechanisms, by any chance? or Chinon?
> Needless to say, these '40 track' drives can correctly read '40 track'
> disks that have been overwritten by 96 tpi drives (since the head in such
> a drive only 'sees' the narrower 96-tpi-like track anyway), but what they
> can't do is overwrite disks formatted or written on real 48 tpi drives.
> Don't ask how I got to sort this out!
Yuk! I can imagine :-)
> The other question, of course, is how reliable do you need it to be.
>
> For example, the last time I wrote a 40 track disk in an 80 track (96
> tpi) drive was when I wrote a TRS-80 Model 4 boot disk on this linux box
> (which has a 1.2Mbyte 96 tpi drive). I did the following :
yes, i do things like that quite often. But not for anything I want to
keep (not the one written in the 80-track drive, anyway) because you never
know if the drive you use next year will be the same...
--
Pete Peter Turnbull
Dept. of Computer Science
University of York
Altos machines came in several generations.
1st Generation
Altos 5-ZZ where ZZ was the size of the HD. These were Z80 machines with 5
1/4 inch drives. These are small rectangular desktop boxes.
Altos 8XXX-ZZ was a large heavy rectangular desktop box with Z80s or 68000
CPUs. These were generally multiuser machines. ZZ again refers to the size of
the 8" HD(10=10 Meg, 12=20 Meg, 14=40 Meg HDs). They used a large custom
single board computer the size of the case. The drive controller was a
separate half card mounted on top of the SBC. The early 8000s had separate
cases for the 8" FD & HD. In later models the drives and cards were
integrated in the same case. I think the 68000 processor machines were
labeled 68XX-ZZ but it has been too long to be sure. I also think the 68000
machines ran an early version of Xenix. You could get them in versions up to
9 users and a supervisor.
2nd Generation
Altos 5XX & 6XX class machines. These looked like squashed hexagons, flat on
the bottom and top with two angles on each side. These were medium sized
desktop cases, usually beige but often came in custom colors. They carried on
the two circuit card configuration. Large SBC with secondary drive controller
card.
Altos 580 was my favorite. Half height floppy and St 225 20 Meg HD with a Z80
and ran 4 terminals under MPM. They would also run CPM. These also came with
FH 10 & 15 Meg HDs
Altos 586 came with a 40 meg FHHD and the new 8086 processor and was a 6 user
machine. These often ran Xenix and were password protected.
While I never had one I think the 686 series machines had the 68000 processor
and ran Xenix.
These were all squashed Hexagonal shaped machines. I think this line went up
to 9XX series numbers with greater amounts of users.
3rd Generation
Then there were the Brown floor towers, Altos II & III. These were multiple
card towers for large amounts of users. These had 80286 and 80386 processors.
I believe there were machines that continued the 680xx processor line too. I
only had a couple of these.
The Altos II terminal is a rebadged Wyse 100 and the Altos III was a Wyse 50.
I think the Altos IV was a Wyse 60 but I am not sure at the moment.
Paxton
