I am looking for a source for the 600 Mbyte magneto optical
5 1/4" cartridges with 512 byte per sector. Tim Shoppa
has mentioned in the past that he might know where I can
find some. Does anyone else? These will be used in a
SONY SMO S-501 5 1/4" magneto optical disk drive.
I have checked eBay, but they are usually sold as is?
Sincerely yours,
Jerome Fine
On 2000-02-16 classiccmp(a)classiccmp.org said to kees.stravers(a)iae.nl
cl>Hi Gang:
cl>Further to this discussion of 5 bit characters on a DL11, this was
cl>also possible on the PCjr. I wrote a BASIC send/receive RTTY
cl>program for the PCjr in 1985. It used an esoteric mode of the
cl>particular serial chip on the PCjr, to support 5 data bits and 1.5
cl>stop bits. The DTR pin of the serial port was used to toggle the
cl>radio from transmit to receive. My modem was homebrew, built around
cl>an XR2211 (IIRC) chip. I still have the modem buried in the
cl>crawlspace somewhere.
This was also possible with the serial port of a regular PC. I have been
running a RTTY BBS on 144 MHz for 10 years, based on a TRS-80 Model I
program I ported to the PC and extended. My program even had an interface
to the nearest packet radio BBS, so RTTY users could exchange mail with
packet users, and later the system could also communicate in CW (morse
code) so you could send emails without having a computer. But nobody uses
RTTY anymore, and even CW is on the decline, so I have taken the BBS down,
no more users.
Kees
--
Kees Stravers - Geldrop, The Netherlands - kees.stravers(a)iae.nl
http://www.iae.nl/users/pb0aia/ My home page
http://www.vaxarchive.org/ Info on old DEC VAX computers
Net-Tamer V 1.08.1 - Registered
Ack! I said:
>dahdidit dit dahdahdidah dididit didahdahdahdah dahdidah dit
>didahdidahdit dahdidah.
And of course it should be dahdahdidit dididit, d?mmit!
Shows you how long ago I've played with my radios!
Wouter "Where's QS1 anyway" ZS1KE
--- John Wilson <wilson(a)dbit.dbit.com> wrote:
> On Wed, Feb 16, 2000 at 06:44:14PM +0000, Tony Duell wrote:
> > Hmmm.. I've tried to learn morse several times, and failed every single
> > time. I don't know why, but it just doesn't seem to 'click' with me.
>
> Well, having an actual use for it makes it a lot easier to remember. My
> best friend and I learned Morse code in 6th grade so that we could pass
> notes in class that no one could understand. Naturally that later fizzled,
> the 7th grade teacher was a ham and the 8th grade teacher was a radio
> operator in the Norwegian underground in WW2, so much for that idea!
My younger brother did that as a kid, too. The teacher tapped back "cut it
out" when they tried it during a test.
> I *always* wanted to do that, I actually bought a DUP11 years ago for this
> purpose but never dug up documentation on it until recently. You'd need to
> build some kind of external clock (PLL really I guess) that synchronized to
> the bit transitions of AX.25, shouldn't be a very big deal though.
My knowledge of sync serial comes from years of working with third party
devices on DEC equipment, but here goes... If the DUP-11 has a COM5025
serial chip on it then what it's expecting is something like a "standard"
bit-rate on its input connector. With the right cable, I'd expect to
feed it clocking through pins 15 and 17 on a DB-25 at EIA levels (+/- 12VDC).
We used to have racks of "modem eliminators" that were effectively null-modem
devices that would provide clocks to DTE equipment on both sides. There were
typically various options to set as well, bit rate being chief among them.
Most of ours were set to between 9600 and 56Kbps with a couple set to 64kpbs
and one to 128kbps for reproducing environments of our European customers.
Sync serial has no start bits, no stop bits, just bits. With protocols like
SDLC, there's a "flag byte" of 0x7E (0111 1110) that the receiving hardware
uses to determine the start and stop of a packet. One efficiency of sync
hardware is you aren't trasmitting 10 bits to communicate 8. The downside
is extra hardware on both ends and slightly more expensive cables to send
it all.
If I'm confusing the DUP-11 with other DEC cards that use the COM5025, sorry.
The original Software Results Corp. COMBOARD used that chip because it was
identical to whatever Qbus card we used to use when we were shipping the
HASPBOX (a PDP-11 with sync serial and a DPV-11 to communicate via parallel
to a PDP-11/70 or VAX-11/7xx).
> Stupid question: what comes out of the other side of a ham TNC these days?
> It used to be Bell 202 modem tones at 1200 baud HDX, over an FM voice signal,
> it *can't* still be that easy though can it?
In the 2 meter band in the U.S., at least, Hams are restricted to 1200 baud.
AFAIK, it is that simple. There are "pocket TNCs" that are little more than
audio modulator circuits that depend on the CPU in your PeeCee to produce
a valid AX.25 bitstream. I've seen it work with an HP-95LX - "pocket packet".
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
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Found this fellow advertising in a ham radio group. I've given him some
correction on that, and offered to forward what he has to the list.
I'm no DigiData expert, but he tells me that the driver software that
comes with the drive is DOS-based. This tells me it's either SCSI or Pertec
(SCSI most likely), and decent SCSI 9-trackers are rare.
He's in Durham, NC, and I doubt he'd be looking for a mint on this thing.
Whoever wants a crack at this, please contact him directly.
-=-=- <break> -=-=-
>>For Sale, best offer:
>>
>>9-track tape drive, rack-mount
>>Digidata Corp, model 1749-86-4-120-FD-UL
>>w/ software, 8-10"reels, 6-8" reels
>>in good working condition
"Chris Slacke" <drivetime(a)mindspring.com>
-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-
Bruce Lane, Owner and head honcho, Blue Feather Technologies
http://www.bluefeathertech.com // E-mail: kyrrin(a)bluefeathertech.com
Amateur Radio: WD6EOS since Dec. '77
"Our science can only describe an object, event, or living thing in our
own human terms. It cannot, in any way, define any of them..."
The Merlin assembler for the Apple II came with a demo program that would
disassemble the Applesoft BASIC ROMs, with comments. I can provide this
disassembly to you.
I think Microsoft sold their 6502 BASIC to Commodore, complete with source
code. Commodore was then able to change the code as needed for their
various 6502 computers.
----------
> From: Richard A. Cini, Jr. <rcini(a)msn.com>
> To: ClassCompList <classiccmp(a)classiccmp.org>
> Subject: Source code for BASIC
> Date: Tuesday, February 15, 2000 08:42 PM
>
> Here's another question...does anyone have a pointer to the source code
for
> a 6502-based BASIC interpreter that's ROMable?
Jerome,
Well if you need 1.3 GB ones, I have 90-something, mostly used but a few are
new... all are rewriteable MO disks, all are HP
Will J
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--- "Shawn T. Rutledge" <rutledge(a)cx47646-a.phnx1.az.home.com> wrote:
> On Wed, Feb 16, 2000 at 04:31:51PM -0800, Ethan Dicks wrote:
> > In the 2 meter band in the U.S., at least, Hams are restricted to 1200
> baud.
>
> No, not exactly. But we are limited to the same bandwidth as an FM
> voice channel, so there is a practical limit. 9600 baud fits into the
> permissible deviation well enough and is commonly used on 2 meters.
I guess things changed when I wasn't looking. Thanks for the update.
-ethan
=====
Infinet has been sold. The domain is going away in February.
Please send all replies to
erd(a)iname.com
__________________________________________________
Do You Yahoo!?
Talk to your friends online with Yahoo! Messenger.
http://im.yahoo.com
Finally got my Mac Portable battery rebuilt, the thing runs great! But I
think I have a problem. Whenever I check the "Battery" DA or the battery
gauge on the menu bar, the batteries never seem to be charged up more than
half way. Anybody got any ideas?
____________________________________________________________
David Vohs, Digital Archaeologist & Computer Historian.
Computer Collection:
"Triumph": Commodore 64C, 1802, Double FDD, GeoRam 512, Okimate 20.
"Leela": Macintosh 128 (Plus upgrade), Nova SCSI HDD, Imagewriter II.
"Delorean": TI-99/4A.
"Monolith": Apple Macintosh Portable.
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<My earliest Intel SBC's have room for 4 24-pin EPROMs, each of which can
<hold 4K, and, if you use a jumpering arrangement derived from the schemati
<rather than from the manual, you can use the 8K parts from MOT. That give
<you 32KB. Isn't that enough to support a customized version of the BASIC
I have 8k rom Basic (actually about 7.25k in size) from Netronics for the
8085 SBC. That was very complete Microsoft Basic-80 cassette basic.
It reqired 1k of ram for the most minimal of programs. IO was vis the SBCs
2k monitor rom.
Another good basic with FP is LLL basic, about 5k (of 8080 code) with
floats.
32k would be Ms disk basic + most of CPM! So size is not an issue.
Often most SBC users only need integer math plus control strutures so they
can run things.
<wouldn't you? There are some public-domain CP/M-compatible I/O handlers
<which use some of the CP/M i/o calls. Naturally, it's a lot of work, but
<you can do it, given you have the source code.
You can fit CPM with BIOS in 8k easily (CCP-2k, BDOS-3.5k, Bios 2.5k)!
If your really lazy yu only need ram to copy it to from a rom so a boot
device is not required.
I have a little SBC I did that has two 32k ram (000-F7FFh), 2k Eprom at
F800 and several IO ports that runs SPM via romdisk (27010 x2 on a 8255
parallel port device). Everything runs from ram. If storage is needed
I have a bit of bios code that routes drive B: to the serial port and a
host system fakes a disk. It's on a 6x4" card no SMT and common stuff
using 8085 running at 5mhz. Everything but the bios is stock code and
the bios is nothing fancy (nearly textbook actually).
Allison
