test-drb

test-drb@ccmp.vtda.org

101090 discussions

by jonnosan＠gmail.com

>The "device control" codes appear to have their familiar uses: > >DC1 = ctrl-Q = reader on >DC2 = ctrl-R = punch on >DC3 = ctrl-S = reader off >DC4 = ctrl-T = punch off >However, it isn't yet clear whether the device being used is truly a >reader/punch, or that these codes are used for some analogous purpose >to turn on/off read/write of another device. That would (to me at least) seem inconsistent with my theory that this is a dialect of Tektronix 4010 control codes - I can't work out any sensible interpretation of the sequence 1) 1D Group Separator 2) 37 7 3) 7F DEL 4) 20 SPACE 5) 40 @ 6) 1F Unit Separator 7) 12 DC2 8) 1D Group Separator 9) 37 7 10) 7F DEL 11) 20 SPACE 12) 40 @ 13) 1F Unit Separator 14) 14 DC4 that would allow for lines 1-6 and 8-13 to be both graphics control codes (positioning the cursor) and lines 7 & 14 to be turning a device on & off. of course, I may be tracing the execution flow wrong, and there could be errors in the dump... >> The escape sequences I see are: >> HEX ASCII >> 1) 1F 26 24 <x y z> : ESC & $ <xyz> >> 2) 1F 26 27 <x y z> : ESC & ' <xyz> >> 3) 1F 26 21 <x y z> : ESC & ! <xyz> >> >> where 1,2,3 are all output at different times, with <x y z> being >> values I haven't yet determined (they are register values i.e. set at >> runtime, whereas the first 3 bytes are hardcoded) >The first value is hex 1B, of course (not 1F). yes - my bad! >The x,y,z values apparently represent a record number (128-byte records). >x is an ASCII digit (30 - 39 hex) >y is an ASCII digit (30 - 39 hex) >z has the range 40 - 5F hex (at sign through underscore)

15 years, 6 months

Legendary steampunk computer 'should be built' - programmer • The Register

by woyciesjes＠sbcglobal.net

http://www.theregister.co.uk/2010/10/05/analytical_engine_build_call/ -- --- Dave Woyciesjes --- ICQ# 905818 --- AIM - woyciesjes --- CompTIA A+ Certified IT Tech - http://certification.comptia.org/ --- HDI Certified Support Center Analyst - http://www.ThinkHDI.com/ Registered Linux user number 464583 "Computers have lots of memory but no imagination." "The problem with troubleshooting is that trouble shoots back." - from some guy in the internet.

15 years, 6 months

identifying terminal by escape codes?

by jam＠magic.com

> >Bears a strong kinship IIRC, to the Beehive Super Bee. > > > >--Chuck > > I cant find a full spec for that terminal, just termcap entries, and a > field service manual for a "mini bee" that I think is related, but > neither seem to fit beyond potential use of "unit seperator (0x1F) as > a "new line" marker (although even that seems a bit iffy, since the > 1F is followed by 0D 0A, i.e. CR/LF) > > I realised I didn't post any actual 'escape' sequences, just uses of > control codes I haven't seen much use of before (US,GS, DC2, DC4). The "device control" codes appear to have their familiar uses: DC1 = ctrl-Q = reader on DC2 = ctrl-R = punch on DC3 = ctrl-S = reader off DC4 = ctrl-T = punch off However, it isn't yet clear whether the device being used is truly a reader/punch, or that these codes are used for some analogous purpose to turn on/off read/write of another device. > The escape sequences I see are: > HEX ASCII > 1) 1F 26 24 <x y z> : ESC & $ <xyz> > 2) 1F 26 27 <x y z> : ESC & ' <xyz> > 3) 1F 26 21 <x y z> : ESC & ! <xyz> > > where 1,2,3 are all output at different times, with <x y z> being > values I haven't yet determined (they are register values i.e. set at > runtime, whereas the first 3 bytes are hardcoded) The first value is hex 1B, of course (not 1F). The x,y,z values apparently represent a record number (128-byte records). x is an ASCII digit (30 - 39 hex) y is an ASCII digit (30 - 39 hex) z has the range 40 - 5F hex (at sign through underscore) James Markevitch

15 years, 6 months

new vintage web site

by shumaker＠att.net

FYI 10 SEPT 2010: MARYLAND INSTITUTE FOR TECHNOLOGY IN THE HUMANITIES (MITH) LAUNCHES VINTAGE COMPUTING SITE: MITH is very pleased to announce a new Web site <http://mith.umd.edu/vintage-computers/> devoted to its sizable (and growing) collection of vintage computers, retro software, and other artifacts from the early era of personal computing. The centerpiece of the site is a a considered metadata and modeling approach to computing hardware, whereby individual components of the vintage machines are documented, contextualized within their relation to the system as a whole, and expressed using Dublin Core. The site gathers links to other recent MITH projects in born-digital cultural heritage, and serves as a clearing house for our expanding portfolio in this area. It also includes newly written non-specialist's documentation for the FC5025 Floppy Disk Controller, a device used to retrieve data off of obsolescent media formats. The site is presented using the content management tool Omeka. It was researched and designed by Walker Sampson, who recently completed an MLS from the School of Information at the University of Texas; Sampson was in residence at MITH this past summer under the auspices of the IMLS-sponsored Digital Humanities Model Internship Program. MITH's Associate Director Matthew Kirschenbaum comments, "This site demonstrates the role that vintage computing can have in the environment of an active digital humanities center; as born-digital cultural heritage becomes ever more important, centers such as MITH will play a part alongside of libraries and archives in addressing its long-term presentation and curation." SOURCE:http://mith.umd.edu/mith-launches-vintage-computing-site/

15 years, 6 months

Multimeter recomendations

by ard＠p850ug1.demon.co.uk

As all of us who do hardware repairs know, a multimeter is an essential piece of test equipment. Until a couple of days ago, I used a Fluke 85 (original series). It did what I wanted, there were 2 parts of the design I didn't like, but apart >from that it was great The 2 thing I didn't like were 1) You have ot dispmantle the meter to change the battery, and it's assembeled with self-tapping screws going into the plastic case. I don't know how many insertions they will stand. 2) The most switch used resistive traces on the PCB with a wiping contact to connect them to an analogue input on the main chip. If that wiper didn't make contact properly, it sometimes got into the wrong mode. It owuld even sometimes power itself up (and flatten the battery) when in the off poosition. Anyway, I was using this iustrument on Saturday (actualy for testing the PSU, etc, in an HP2623 graphics terminal) with no problems. I put it away in my tool drawer. On Sunday I got it out for some other tests and discovered the display had failed. It's totally black for half the height, I asusem the liquid crystal material has leaked out (although the glass is not obviously cracked or broken). AFAIK nothing fell on it in the tool drawer (there are no really heavy tools in there anyway), it wasn't dropped, etc. Just one of those things. Alas Fluke say they can no longer supply the display for this insturment as a spare part. Given that I need the standard functions only (including a good continuity tester!), don't need excessive accuracy, and would like to be able to fix it if anything goes wrong, does anyone have any recomendatins? I am not conviced I should buy another Fluke, BTW. Long shot : Does anyone have a defective original-series Fluke 80 with a good display (maybe the ASIC has died or something). I would be interested in buying it. -tony

15 years, 6 months

identifying terminal by escape codes?

by jonnosan＠gmail.com

>Bears a strong kinship IIRC, to the Beehive Super Bee. > >--Chuck I cant find a full spec for that terminal, just termcap entries, and a field service manual for a "mini bee" that I think is related, but neither seem to fit beyond potential use of "unit seperator (0x1F) as a "new line" marker (although even that seems a bit iffy, since the 1F is followed by 0D 0A, i.e. CR/LF) I realised I didn't post any actual 'escape' sequences, just uses of control codes I haven't seen much use of before (US,GS, DC2, DC4). The escape sequences I see are: HEX ASCII 1) 1F 26 24 <x y z> : ESC & $ <xyz> 2) 1F 26 27 <x y z> : ESC & ' <xyz> 3) 1F 26 21 <x y z> : ESC & ! <xyz> where 1,2,3 are all output at different times, with <x y z> being values I haven't yet determined (they are register values i.e. set at runtime, whereas the first 3 bytes are hardcoded)

15 years, 6 months

I-mode phone

by evan＠snarc.net

A curator at the Computer History Museum needs to borrow (or obtain) a first-gen I-mode cell phone. This is for a long-term exhibit on the history of portable computing. I'm involved in the project, so I offered to ask around, including here on cctalk. However they need is * quickly *. If anybody has one they're willing to part with, please email me off-list ASAP.

15 years, 6 months

identifying terminal by escape codes?

by jonnosan＠gmail.com

I am trying to disassemble some ROM dumps from the SacState 8008 machine (per http://www.classiccmp.org/pipermail/cctalk/2010-September/291012.html ) I can see a lot of escape codes being sent, but they don't make sense (to me at least) as Tektronix 4023 escape codes, which is the terminal type reported as being used with that machine. For example, the first thing output after a restart is: HEX ASCII 1F Unit Separator 0D CR 0A LF 3F ? pressing the keys "!\h" would generate this sequence: 1D Group Separator 37 7 7F DEL 20 SPACE 40 @ 1F Unit Separator 12 DC2 1D Group Separator 37 7 7F DEL 20 SPACE 40 @ 1F Unit Separator 14 DC4 Does anything there look familiar to anyone at all? this would be some kind of terminal from early to mid 70s. Cheers Jonno

15 years, 6 months

Apple IIe manuals have been claimed

by charlesmorris800＠centurytel.net

Thanks for all the responses! The IIe manuals have sold.

15 years, 6 months

FS: Apple IIe manuals

by charlesmorris800＠centurytel.net

Continuing to clear the bookshelves :) I have a set of original Apple IIe manuals for sale. Apple IIe Owner's Manual, IIe Reference Manual, 80-Column Text Card, Reference Manual Addendum (Monitor Listings), Extended 80-Column Text Card Supplement, DOS Programmer's Manual, ProDOS User's Manual, ProDOS Supplement to the IIe Owner's Manual, AppleWriter II, & Super Serial Card User's Manual. http://s1181.photobucket.com/albums/x426/DrCharlesMorris/?action=view&curre… $20.00 plus 8 lb (Media Mail) postage from zip 65775. Also an original Apple II Reference Manual: http://s1181.photobucket.com/albums/x426/DrCharlesMorris/?action=view&curre… $5.00 plus 1 lb postage. please contact me off-list if interested. I've got the //e also with Duo-Disk floppy drive, but it won't be worth the postage! thanks Charles

15 years, 6 months

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test-drb