test-drb

test-drb@ccmp.vtda.org

101090 discussions

by dwightk.elvey＠amd.com

>From: "Dwight K. Elvey" <dwightk.elvey(a)amd.com> > >>From: tlindner(a)ix.netcom.com >> >>> Here's one: >>> >>> http://www.kim-1.com/usrman.htm#E >> >>Ahh, this is really diffferent! >> >>This uses: >> >>'0 bit' - 18 square cycles at 3700 Hz. >> 6 square cycles at 2400 Hz. >> >>'1 bit" - 9 square cycles at 3700 Hz. >> 12 square cycles at 2400 Hz. >> >>Both are the same length (7.452 microseconds). >> >>As you can probably tell, I am currently anaylizing this at a very low >>level. >> >>-- >>tim lindner tlindner(a)ix.netcom.com >> > >Hi > Here is one that is even a little different still. >It is what is called Manchester encoding, using biphase >clocking. You don't indicate 1 or 0, you indicate a change >by a quick clock and no change by a long clock. > It looks something like this: > > ___ _ ___ _ > |___| |_| |_| |______ Opps! Shuld have been: ___ _ ___ _ ___ |___| |_| |_| |___| > > Depending on past history, this might be: > > 0 0 1 1 0 0 0 > > or > > 1 1 0 0 1 1 1 > > > This is the type of encoding used on my Poly88 for >what they call PolyPhase. This runs at 2400 baud. > There is a standard called Byte format that uses 300 baud >and the two tones 1200 and 2400. > Besides the type of encoding, you also need to know >what the record formats looks like. Do you have one long >record for the entire file? What does the header look like? >Is it synchronous or asynchronous? Is there parity, check sum, >CRC or ECC? > There are a lot of things that need to be built up into >a complete tape decoder. A tape writer would be used >by more than a tape reader. One should only need to read >the tape once but many people would often like to create >a tape from that same data. You really want both. > One should also note that most audio tape to digital >inputs on these old computers filtered the signal some >to optimize the audio signal for decode. This was done >on both read and write of the signal. >Dwight > > >

23 years, 4 months

Computer Audio Tape Formats

by dwightk.elvey＠amd.com

>From: tlindner(a)ix.netcom.com > >> Here's one: >> >> http://www.kim-1.com/usrman.htm#E > >Ahh, this is really diffferent! > >This uses: > >'0 bit' - 18 square cycles at 3700 Hz. > 6 square cycles at 2400 Hz. > >'1 bit" - 9 square cycles at 3700 Hz. > 12 square cycles at 2400 Hz. > >Both are the same length (7.452 microseconds). > >As you can probably tell, I am currently anaylizing this at a very low >level. > >-- >tim lindner tlindner(a)ix.netcom.com > Hi Here is one that is even a little different still. It is what is called Manchester encoding, using biphase clocking. You don't indicate 1 or 0, you indicate a change by a quick clock and no change by a long clock. It looks something like this: ___ _ ___ _ |___| |_| |_| |______ Depending on past history, this might be: 0 0 1 1 0 0 0 or 1 1 0 0 1 1 1 This is the type of encoding used on my Poly88 for what they call PolyPhase. This runs at 2400 baud. There is a standard called Byte format that uses 300 baud and the two tones 1200 and 2400. Besides the type of encoding, you also need to know what the record formats looks like. Do you have one long record for the entire file? What does the header look like? Is it synchronous or asynchronous? Is there parity, check sum, CRC or ECC? There are a lot of things that need to be built up into a complete tape decoder. A tape writer would be used by more than a tape reader. One should only need to read the tape once but many people would often like to create a tape from that same data. You really want both. One should also note that most audio tape to digital inputs on these old computers filtered the signal some to optimize the audio signal for decode. This was done on both read and write of the signal. Dwight

23 years, 4 months

Computers with ports coming out the front?

by pete＠dunnington.u-net.com

On Dec 17, 5:22, vassilip(a)dsl.cis.upenn.edu wrote: > I am amazed that Tony didn't mention this, but the BBC micro had a number > of expansion connectors under the keyboard facing towards the front of > the machine. To access these ports, you had to lift the whole machine > and plug IDC terminated ribbon cables. As I recall, you had the 1MHz > expansion bus, the printer port, the Tube (2nd processor bus) and a > disk interface connector. You also had a power output connector allowing > you to power external devices (e.g. external floppies). >From left to right, 34-pin floppy interface, 26-pin parallel printer, 20-pin user port, 34-pin 1MHz bus, 40-pin Tube (second processor interface). -- Pete Peter Turnbull Network Manager University of York

23 years, 4 months

Computer Audio Tape Formats

by pete＠dunnington.u-net.com

On Dec 17, 13:50, tim lindner wrote: > I am looking for information regarding how various computers wrote > information to audio tapes. > I am contemplating creating an audio tape anaylzer to help me recover > some data. I would like to make the program useful to thoes outside the > Color Computer community. But first I need to understand all of the > different methods used to put data on audio tape. Look up "Kansas City" and "CUTS" on the web... many machines used some derivative. For 300 baud: logic 0 is 4 cycles of a 1.2kHz tone logic 1 is 8 cycles of a 2.4kHz tone lead-in is 2.4kHz, followed by a zero byte Similarly for 1200 baud but fewer cycles. CUTS (Computer Users Tape Interface) was derived from KC format, which was so called because it came out of a meeting held in Kansas City in 1975. It's backwards compatible. Also look up Don Tarbell's system. I can't remember what the tones were, but it's about 600 baud, IIRC. None of this tells you about the format of the data, of course -- block headers (if any), checksums/CRCs, etc. That tended to vary. -- Pete Peter Turnbull Network Manager University of York

23 years, 4 months

Computer Audio Tape Formats

by glenslick＠hotmail.com

Here's one: http://www.kim-1.com/usrman.htm#E >From: tlindner(a)ix.netcom.com (tim lindner) >Reply-To: cctalk(a)classiccmp.org >To: classiccmp(a)classiccmp.org (Classic Computers) >Subject: Computer Audio Tape Formats >Date: Tue, 17 Dec 2002 13:50:31 -0800 > >I am looking for information regarding how various computers wrote >information to audio tapes. _________________________________________________________________ Tired of spam? Get advanced junk mail protection with MSN 8. http://join.msn.com/?page=features/junkmail

23 years, 4 months

Computer Audio Tape Formats

by tlindner＠ix.netcom.com

I am looking for information regarding how various computers wrote information to audio tapes. For example, the Tandy Color Computer wrote ones and zeros to audio tape in the following format: 'one bit': one sinusoidal cycle @ 2400 Hertz. 'zero bit': one sinusoidal cycle @ 1200 Hertz. The bit rate is variable on a CoCo tape. But averages to about 1500 bits per second. I am contemplating creating an audio tape anaylzer to help me recover some data. I would like to make the program useful to thoes outside the Color Computer community. But first I need to understand all of the different methods used to put data on audio tape. -- tim lindner tlindner(a)ix.netcom.com

23 years, 4 months

Amiga and X-windows

by ghldbrd＠ccp.com

Thanks to a post here by Curt Nelson, I am the proud owner now of some interesting Amiga goodies . . . . I have a question to all those Amigaphiles out there: I have a copy of X Window System by GfxBase. It looks like a graphic terminal emulation for *nix systems, which looks like a neat toy for playing with my Linux box. Have any of you ever played with this, or even seen it in action? I do have a 10 Base 2 Ethernet card for the PC here, but other than that, my networking experience is zero. Looks like I'm going to be learning some new stuff over the next few months. Gary Hildebrand St. Joseph, MO

23 years, 4 months

IBM 5150 for sale

by vcf＠siconic.com

I am passing this message along to anyone (presumably in the UK) who is interested in an IBM 5150. Please reply to the original sender. Reply-to: <slipperysli(a)hotmail.com> or <mail(a)slibob.com> ---------- Forwarded message ---------- Date: Tue, 10 Dec 2002 12:29:10 +0000 From: Simon Taylor <slipperysli(a)hotmail.com> Reply-To: mail(a)slibob.com Subject: IBM 5150 Hi I have a 1981 IBM 5150, complete with monitor and tracotr-feed dot-matrix printer which I am hoping to sell. Are you interested? If you aren't please could you put me in touch with anyone who might be interested? Please let me know if you can or can't help me. Thanks very much Simon Taylor http://www.slibob.co.uk/ Tel: 07021 118445 Txt: 07951 704272 -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

23 years, 4 months

Sinclair QL

by pegran＠online.no

Hello. After having stumbled accross the page http://www.classiccmp.org/pipermail/cctech/2002-October/003501.html, I wonder if you have any Sinclair QLs left, what state they are in, and how much they cost. Regards, Per Granaune

23 years, 4 months

Apple Mac SE/30 monitor available?

by freddy＠kotelna.sk

Hello again, perhaps a bit uncommon question, but does anyone in (preferrably middle) Europe have a 9" crt tube for Mac SE/30? I suppose it's the same as in SE, the box definitely looks the same. I've broken mine by accident, and really would like to use this box ;) Thanks in advance, -- freddy ...for more info 'finger freddy(a)kotol.kotelna.sk'

23 years, 4 months

Another Decmate III available

by trestivo＠concentric.net

To all, the first Decmate III sold on Ebay, another one is now posted. If your interested take a look at http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&category=179&item=2082422826 thanks, and happy holidays to all!

23 years, 4 months

Need a home for some HP gear - UK.

by tim.myers＠protasis.co.uk

Here are some pictures for those of you who maybe interested : http://www.computer-museum.org.uk/images/P0001355.jpg http://www.computer-museum.org.uk/images/P0001356.jpg http://www.computer-museum.org.uk/images/P0001357.jpg http://www.computer-museum.org.uk/images/P0001358.jpg http://www.computer-museum.org.uk/images/P0001364.jpg http://www.computer-museum.org.uk/images/P0001360.jpg Tim.

23 years, 4 months

Ebay [was: Re: The ACE is recovering :-)]

by pete＠dunnington.u-net.com

On Dec 17, 17:09, Philip Pemberton wrote: > My problem is that the shipping price he's given me is for Germany... > I think I'm going to stuff EUR8 in an envelope and send it (like you said), > it's the easiest way to get this sorted out... Postage Austria <--> UK isn't much different from Austria <--> (anywhere else in EC), so I'd just send him EUR8 and see what happens. -- Pete Peter Turnbull Network Manager University of York

23 years, 4 months

Looking for certain software packaging ($$$)

by vcf＠siconic.com

I am searching out any retail software packaging that conforms to the following description: The front cover of the packaging has a flap that opens up (like a book) to reveal a manual or pamphlet inside. The flap must be part of the box itself, and not part of a sleeve that slips over the box. I have Delrina WinFax Pro 3.0 which almost fits this description but the flap is part of a sleeve that fits over the main box. Any software in question must have been published or put on the market prior to March of 1996. One possible example may be Delrina WinFax Pro 4.0 (which is what I was originally searching for a couple months back). If you have any software packaging that fits this description, please contact me directly at <sellam(a)vintage.org>. There is a bounty for this! -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org * Old computing resources for business and academia at www.VintageTech.com *

23 years, 4 months

Ebay [was: Re: The ACE is recovering :-)]

by Antonio.Carlini＠riverstonenet.com

>rating, 99% positive. The problem? He's given me a shipping price of EUR2.55 >per batch of three chips, plus EUR1 for three ROMs. I've ordered six ROMs, >so that comes to EUR3.55 x 2 = 7.10. But he seems to be ignoring my mails >requesting a postage price for me. Bear in mind I'm in England (ho hum). The What's the problem? If you are happy about the total price (7.10euro) for the ROMs just pop 8 euro into an envelope with a letter wrapped round them indicating where you want them posted to. Include an email address and I expect he'll get back to you if there is a problem. This has always worked for me ... both with Europe and the US. Antonio

23 years, 4 months

Little score, & possible VAX 630 rescue...

by dwoyciesjes＠comcast.net

On the way home today, I decided to stop at the local Goodwill, in my (never-ending?) search for Mac ADB keyboard cables. Well, I picked up a working Mac SE/30 w/ keyboard for $5.00, and a 18" x 30" Guiness chalkboard for $12.00. No keyboard cable with the Mac, though... Sigh... The search continues... A local used computer shop did net me a Mac keyboard and cable, for $10. Now, on to the Vax. I have a lead on a forgotten DEC Industrial Vax 630. I don't know what in it or anything yet. It's just the (about) 30" x 19" x 10" rackmount unit. Apparently, about 10 -12 years ago, DEC had a contract with a Southern CT company, that makes industrial keyboards and mice. DEC shipped them the Vax, to test the devices, all of them. They never asked for the machine back. The moniter that went with it has since died. That may still be around, but I don't know. As far as they know, the Vax still works. Well, at least last time the powered it up. I'm waiting to see what the company wants to do with it, but if I tell them someone wants to buy it, that may help. It's a heavy little beast, so shipping may be a bit much. They'll probably prefer that you pick it up, but I'm sure something can be worked out if necessary. Contact me off-list. -- ---Dave Woyciesjes ---ICQ# 905818

23 years, 4 months

RS232 or Parallel port based keyboards and joysticks

by Robert_Feldman＠jdedwards.com

The Palmtop Paper's Online Store has KeyMate adaptors and software that allow any PS/2-plug PC keyboard to be used with the HP 200LX's serial port or IR port (under MS-DOS 5.0). $69.95 +s/h. http://www.palmtoppaper.com/store/asp/product.asp?product=98 "Ram & Suganthi M." wrote: > > Hi, > > Does anyone know where I can get a keyboard that either plugs into an RS232 > / RS422 or Parallel Port? Ditto for a joystick. I want to connect a > keyboard to a transputer array for stand-alone operation and I already have > RS232 / Parallel ports on the array. > > Thanks, > > Ram

23 years, 4 months

RS232 or Parallel port based keyboards and joysticks

by ram_suganthi＠hotmail.com

Hi, Does anyone know where I can get a keyboard that either plugs into an RS232 / RS422 or Parallel Port? Ditto for a joystick. I want to connect a keyboard to a transputer array for stand-alone operation and I already have RS232 / Parallel ports on the array. Thanks, Ram _________________________________________________________________ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail

23 years, 4 months

Looking for certain software packaging ($$$)

by Robert_Feldman＠jdedwards.com

ISTR that the Traveling Software word processor (software on cassette tape) I bought for a TRS Model 100 was packaged like that. I no longer have it, but the date was early 90's. Bob -----Original Message----- From: Dan Veeneman [mailto:dan@ekoan.com] Sent: Tuesday, December 17, 2002 6:52 AM To: cctalk(a)classiccmp.org Subject: Re: Looking for certain software packaging ($$$) At 06:26 AM 12/17/02 -0800, you wrote: >Would any Commodore cassette software do? >I think I have a c64 or vic 20 game that was packaged like that Almost all of the Intellivision game cartridges were packaged like that as well. I don't know if that counts as "software" for Sellam's purposes or not. Cheers, Dan

23 years, 4 months

Computers with ports coming out the front?

by Robert_Feldman＠jdedwards.com

Yes, pin 7 of the modem port is for +12V. The pinout of the DE-9P (except for some early boards with a female DE-9) is: 1 Gnd 2 TXD 3 (not used) 4 MSB (Modem Status Bit) 5 CTS 6 RXD 7 +12V 8 MCB (Modem Control Bit) 9 RI The Tech manual goes on to say all signals are TTL, and the interface is "extremely vulnerable to damage through misuse." Also, some modems with RS-232C connectors need an external adapter box so that the OI isn't damaged. modem port Bob -----Original Message----- From: Gary Hildebrand [mailto:ghldbrd@ccp.com] Sent: Monday, December 16, 2002 11:33 PM To: cctalk(a)classiccmp.org Subject: Re: Computers with ports coming out the front? Lawrence Walker wrote: > > Yup, the whole shebang. External Battery, keyboard, printer, video, > serial RS232 and Modem. BTW what was the difference between the > modem and RS232 ports ? > > Lawrence Besides number of pins . . . . I think the 9 pin Modem port was for the accessory modem and has DC feeding the box that fits in the disk bay. The RS232 could be configured to drive a serial printer which was the common interface back then, especially on daisywheels. Gary Hildebrand St. Joseph, MO

23 years, 4 months

Computers with ports coming out the front?

by foxnhare＠bigvalley.net

Heh.. While looking at a Transactor Magazine tonite (fomr something else), I had noticed this bit in the new Products Section (from January 1986) Commodore 64 Remote Keyboard Conversion Kit What it is - an extension ribbon cable for the 64 keyboard top with shells for the PCboard bottom and Keyboard top. From the news item: Remote Keyboard Conversion Kit If you have a Remote Keyboard Conversion Kit - Here's that you have: [picture of keyboard in front of bottom of 64 with ports facing the keyboard] - a keyboard for your lap, lean back-relax. - Keyboard to pass around when playing games - Keyboard not restricted in movement by 5 cables - A computer with cable plugs facing you (in the 64's design that would be Parallel user port, TV, Video, Disk Drive/Printer, Cassette and Cartridge.) - A Computer you can change cabling and accessories easily. - Color keyed to match the original unit (the brownish breadbox style) Friendly Systems, Inc. 1845 Range St. Suite A Boulder, CO 80301 (from page 77 of the Jan '86 Transactor Vol.6,Iss.4) And didn't some rack mounted 8-bits (Apple, Atari, and 64) have the ports out the front? I read about such units at major software places like EA, they were custom mountings though. ... Thinking on that you might find rack mounted PCs with forward ports too in late 80's industrial component catalogs... Larry -- 01000011 01001111 01001101 01001101 01001111 01000100 01001111 01010010 01000101 Larry Anderson - Sysop of Silicon Realms BBS (209) 754-1363 300-14.4k bps Set your 8-bit C= rigs to sail for http://www.portcommodore.com/ 01000011 01001111 01001101 01010000 01010101 01010100 01000101 01010010 01010011

23 years, 4 months

1977 Apple II for sale. (ABECLASSIC)

by dfnr2＠yahoo.com

"Chandra Bajpai" <cbajpai(a)attbi.com> wrote: > Btw - Does anyone know who the guy at ebay user id 'abeclassic' is? I > wish I had his deep pockets...he bids on a lot of things and definitely > outspends everyone. Some times I wonder if it's worth bidding on if he > his even thinking about the same item. DEFINITELY continue to bid your price on items you want. If you lose, so be it, but make him pay at least that much, or he won't even have to use any discretion when selecting auctions. Dave __________________________________________________ Do you Yahoo!? Yahoo! Mail Plus - Powerful. Affordable. Sign up now. http://mailplus.yahoo.com

23 years, 4 months

Old TI analog sound chip; info?

by dan＠ekoan.com

At 08:07 PM 12/16/02 -0600, you wrote: >I'm fairly sure Radio Shack at one time sold some of those >particular sound generator chips too. Yes, I have a SN94281 in a Radio Shack package. >I have the data sheet for the SN94281, but I'm not sure about the other >two. If it would be helpful, I can scan it. I've started to scan some of my old data sheets. The panels for the SN94281 can be found at http://www.decodesystems.com/old-ics.html Cheers, Dan http://www.decodesystems.com/wanted.html

23 years, 4 months

Need information on TRSDOS 1.3 internals

by tim＠tim-mann.org

Sellam Ismail wrote: > Are the TRSDOS 1.3 internals documented in any of the TRS-80 reference > manuals? As far as I know, Tandy never documented the on-disk data structures for Model III TRSDOS. We were stuck figuring them out for ourselves even in the old days. They did document the assembly language interface to the OS. There's a scan of the part of the Model III manual that deals with TRSDOS 1.3 user commands and assembly-language entry points on Wade Fincher's site: http://www2.asub.arknet.edu/wade/m3trsdos.pdf -- Tim Mann tim(a)tim-mann.org http://www.tim-mann.org/

23 years, 4 months

BIG problem with my Jupiter Ace

by Lee.Davison＠merlincommunications.com

>> There is just no pleasing some people. 8^)= >> http://zx.dyndns.org/trastero/cosas/droy/jupiter/ >> You want the .pdf near the end. > Interesting how he got blue as a background when the real Ace used > black..... I would guess he's using an RGB monitor, but can't say for sure as babelfish stops translating half way down the page. Curses! Lee. ________________________________________________________________________ This e-mail has been scanned for all viruses by Star Internet. The service is powered by MessageLabs. For more information on a proactive anti-virus service working around the clock, around the globe, visit: http://www.star.net.uk ________________________________________________________________________

23 years, 4 months

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