test-drb August 2004

test-drb@ccmp.vtda.org

283 participants
661 discussions

by vcf＠siconic.com

I've got an RDI BriteLite IPX portable. Neat machine. Does anyone know if this has a color or monochrome LCD display? -- Sellam Ismail Vintage Computer Festival ------------------------------------------------------------------------------ International Man of Intrigue and Danger http://www.vintage.org [ Old computing resources for business || Buy/Sell/Trade Vintage Computers ] [ and academia at www.VintageTech.com || at http://marketplace.vintage.org ]

21 years, 1 month

Let's develop an open-source media archive standard

by dwight.elvey＠amd.com

>From: "Jay West" <jwest(a)classiccmp.org> > >Dwight wrote... >> Things I don't like: >> Format is octal ( I prefer hexadecimal ) >Blasphemy!! *Grin* > Hi It was my mothers fault. She would never let me play with the smart kids. Dwight

21 years, 1 month

PET startup sequence?? (was LF: Commodore PET schematics, troubleshooting info)

by dave04a＠dunfield.com

At 17:43 10/08/2004 -0700, you wrote: >Hi Dave > A common failure item in these old machines is the RAM. >Any failure of the RAM makes things like subroutines fail >quickly. >Dwight Yeah - that did occur to me - hard to diagnose for certain - all the RAM's are soldered in. I did remove and socket the ROM's today - so with an EPROM emulator I can put boot code in fairly easily - anyone know what the minimum I need to do to setup the video and any other essential hardware is? Also a memory MAP would be handy (I think I saw one in the Archive - I'll look, however if anyone knows where the RAM limits are and where Video memory is - could save me sime time. If I can figure out where the RAM is, and how to write to the screen, I can boot a small RAM test in the Kernal ROM space. Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

21 years, 1 month

monitor program

by tyger69＠chartermi.net

"Joe" wrote: Unless you use a Zenith PC. They came with a monitor/debugger built into ROM. Just use CNTL-ALT-INSERT to bring it up. OTOH I've had very good results just using Debug with MS-DOS. Joe I've always liked the monitor in my Columbia MPC series better than Zenith's. It allows easy access to the disks, sector-by-sector, for (R)eads or (W)rites. The Zenith makes you jump through hoops to accomplish the same thing. BTW, I never got into DEBUG much, but my all-time favorite program is DDT under CP/M. --T Jam the computer...trash every lethal machine in the land! -- Timothy Leary

21 years, 1 month

PET startup sequence?? (was LF: Commodore PET schematics, troubleshooting info)

by dwight.elvey＠amd.com

Hi Dave A common failure item in these old machines is the RAM. Any failure of the RAM makes things like subroutines fail quickly. Dwight >From: "Dave Dunfield" <dave04a(a)dunfield.com> > >>> Deos ftp://ftp.funet.fi/ still exist? That used to be a good place for >>> Commodore schematics and technical info, >> >>Yup, FUNET's still alive. <ftp://ftp.funet.fi:/pub/cbm> for the CBM stuff. >>There's also a web-based version at <http://nic.funet.fi/pub/cbm/index.html>. > >Thanks guys - that helps a lot. > >+++ > >Does anyone have "inside" information on exactly what the PET firmware does when >it starts up? > >I am still working on the same pair of SuperPET 9000's (one works, one does not). >Both machines have been stripped to just the base 6502 board. > >The "bad" machine plays it's tune and clears the screen - then appears to hang. >(If you reset it with the monitor warmed up, you can see the screen fill with >"garbage" and then clear - just like the working one). > >Code appears to be running: > > - If I remove the KERNAL rom, the startup beep does not occur, and the screen > never initializes, so it looks like this ROM is executing. > > - After it appears to "hang", the code still seems to be running. Looking at > the 74LS154 decoder which shows accesses within 4k boundaries, I see lots of > accesses to 0xxx (probably page0 RAM), no accesses to intervening locations > and lots of access to the ROM's, which follow a clearly identifiable pattern. > Removing any ROM prevents this from happening, with the machine just "flailing" > until it gets a HLT - so it looks like it may actually be running ROM code. > > - I can see accesses to the keyboard scanner. > >On the working machine, after accessing all ROM's as BASIC starts (and prints it >welcome message), it settles into a keyboard scan which appears to exist within >the KERNAL and EDIT rom's - the BASIC ROM's are not accessed unless some function >is activated. > >The non-working machine appears to hang during the phase where it is accessing all >ROM's - it continues to do this indefinately. > >It looks like the system is hanging during the initialization of BASIC - it never >prints the welcome message (hangs with blank screen). > >So far I have been unable to determine what it is doing exactly - any info on the >startup sequence would be MOST appreciated! > >I have verified that the ROM's contain exactly the same code as the other machine >(I've seen several PET's fail with bad ROM's, however this does not appear to be >the case here). > >Regards, >Dave >-- >dave04a (at) Dave Dunfield >dunfield (dot) Firmware development services & tools: www.dunfield.com >com Vintage computing equipment collector. > http://www.parse.com/~ddunfield/museum/index.html > > >

21 years, 1 month

Pristine systems at scrappers...

by lbickley＠bickleywest.com

One of our local scrappers called me up today about some systems they pulled >from a working site. I went and looked at them and they must have been in a controlled environment - they are all in excellent to pristine condition. They will be scrapped shortly - in fact, by the time I got there (two hours after the call) - one big Teradyne was already stripped :-( If you are interested in any of these, let me know immediately and what price you'd like to offer for the equipment. The equipment is in the San Francisco Bay Area - shipping on some of this stuff would be costly (RA82/VAX, Sequents, Teradyne, IBM 3720).... Several VAX 3100 (M76 and M38) Several Digital BA42s with RZ55, RZ56 and RZ57 Digital RA82/VAX 3600 Sequent (1) S2000/500 and (1) S2000/200 Teradyne S16 (?) IBM Power 530 IBM 3720 Lyle -- Lyle Bickley Bickley Consulting West Inc. http://bickleywest.com "Black holes are where God is dividing by zero"

21 years, 1 month

PET startup sequence?? (was LF: Commodore PET schematics, troubleshooting info)

by dave04a＠dunfield.com

>> Deos ftp://ftp.funet.fi/ still exist? That used to be a good place for >> Commodore schematics and technical info, > >Yup, FUNET's still alive. <ftp://ftp.funet.fi:/pub/cbm> for the CBM stuff. >There's also a web-based version at <http://nic.funet.fi/pub/cbm/index.html>. Thanks guys - that helps a lot. +++ Does anyone have "inside" information on exactly what the PET firmware does when it starts up? I am still working on the same pair of SuperPET 9000's (one works, one does not). Both machines have been stripped to just the base 6502 board. The "bad" machine plays it's tune and clears the screen - then appears to hang. (If you reset it with the monitor warmed up, you can see the screen fill with "garbage" and then clear - just like the working one). Code appears to be running: - If I remove the KERNAL rom, the startup beep does not occur, and the screen never initializes, so it looks like this ROM is executing. - After it appears to "hang", the code still seems to be running. Looking at the 74LS154 decoder which shows accesses within 4k boundaries, I see lots of accesses to 0xxx (probably page0 RAM), no accesses to intervening locations and lots of access to the ROM's, which follow a clearly identifiable pattern. Removing any ROM prevents this from happening, with the machine just "flailing" until it gets a HLT - so it looks like it may actually be running ROM code. - I can see accesses to the keyboard scanner. On the working machine, after accessing all ROM's as BASIC starts (and prints it welcome message), it settles into a keyboard scan which appears to exist within the KERNAL and EDIT rom's - the BASIC ROM's are not accessed unless some function is activated. The non-working machine appears to hang during the phase where it is accessing all ROM's - it continues to do this indefinately. It looks like the system is hanging during the initialization of BASIC - it never prints the welcome message (hangs with blank screen). So far I have been unable to determine what it is doing exactly - any info on the startup sequence would be MOST appreciated! I have verified that the ROM's contain exactly the same code as the other machine (I've seen several PET's fail with bad ROM's, however this does not appear to be the case here). Regards, Dave -- dave04a (at) Dave Dunfield dunfield (dot) Firmware development services & tools: www.dunfield.com com Vintage computing equipment collector. http://www.parse.com/~ddunfield/museum/index.html

21 years, 1 month

NExt Station for sale

by soheilasoheil＠yahoo.com

Excellent condition. Looks new. If interested, please send email to foadamoon(a)yahoo.com. Price $475. we can email you pictures: NeXTstation Color 32MB Memory 406 MB Hard Disk Drive and Floppy disk drive Keyboard + Mouse + Sound Box + CD ROM NeXTstation (MegaPixel) 21-inch Color Monitor SCSI port A and B serial ports DSP port Display port Printer port Twisted-pair and thin-wire Ethernet port Miniphone jack for headphones Left and right line-out jacks NeXT Mach 3.3 (Processor 68040) All original Software CDs Network and System Administration Manual User’s Reference Manual NEXTSTEP User’s Guide NEXTSTEP Object-Oriented Programming and The Objective C Language Setup and Tutorials Manual Applications Manual Service Guide NeXSTEP Programming (Simson L. Garfinkel, Michael K. Mahoney) __________________________________ Do you Yahoo!? Yahoo! Mail - 50x more storage than other providers! http://promotions.yahoo.com/new_mail

21 years, 1 month

TIL306...any leads

by trash3＠splab.cas.neu.edu

The first edition of the Optoelectronics Data Book for Design Engineers by Texas Instrument, date unknown, probably early 70's lists this device along with a test circuit. The six pages have specs and a small application circuit for cascading the displays. No other circuits are in my library as far as I can tell. Joe Heck

21 years, 1 month

TIL306...any leads

by ofthe_girl＠hotmail.com

I am looking for TIL306 circuits do you have any leads as to where i can get some?? best regards -Cassandra Munro

21 years, 1 month

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test-drb August 2004