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Old Nokia/alfaskop 3270 terminal

by dave.g4ugm＠gmail.com

Folks, Can any one remember how to get an AlfaSkop terminal into local setup mode> Dave Wade G4UGM & EA7KAE

6 years, 4 months

Anyone have any hardware docs on a Hyundai Super LT-3 80286 laptop?

by peter.veprek＠gmail.com

Hello, I've got a vintage Hyundai Super LT-3 80286 laptop, I just fixed the problem with CMOS battery but I'm unable to find any information about HDD settings. When I go to BIOS, there are 2 possible disk positions but I don't know which one to use and what settings I should choose. I'd like to ask you to let me know how to set this up. You also wrote in you post that you're goint to experiment with the switches which are right below the left bottom corner. If you got any news regarding these, I would appreciate it. Thank you in advance for your help. Regards, Peter Veprek

6 years, 4 months

Info / packs for Amcodyne 7110 "Arapahoe" drive?

by derschjo＠gmail.com

Hi all -- Got one of these: http://www.bitsavers.org/pdf/amcodyne/7110/Arapahoe_7110_Brochure_Nov84.pdf sans power supply and packs. I'm guessing that these packs were specific to this drive and not any sort of standard, and that tracking one down is going to require quite a bit of luck. Figured I'd start here :). Also looking for technical info (pinouts for the power connector would be a good start...) Thanks as always, Josh

6 years, 4 months

Pro-380 power supply

by paulkoning＠comcast.net

I have a Pro-380 with an H7862-C power supply. Recently the power supply input filter (where the cord plugs in) shorted out, causing melted filter guts to leak out of the case and put a big smoke cloud in the room. Fortunately I have a spare, but it's an H7862 (not -C). I'm planning to replace the failed input filter, but in the meantime: does anyone know what the difference is between the two versions? Is it just a design tweak, or does the -C have different specs (like higher current ratings)? The replacement came out of a Pro-350 component set. paul

6 years, 4 months

3M third-party replacement flex-print cables

by aek＠bitsavers.org

I started going through my cable sets and put a few up on eBay this morning.

6 years, 4 months

Motorola app notes (Al Kossow)

by ruppert＠seism.com

Al, I have the original Motorola paper version of AN1123. I?m happily to scan it for you. I have a pretty complete set from an139 into the 1100s if there are others you need. Regards, Stan Ruppert

6 years, 4 months

RL02 head gain adjustment: Limits?

by cz＠alembic.crystel.com

So in the continuing quest of fixing my second RL02 I replaced the heads and found the drive was slow and would generate about 80 block errors on a pack where my reference RL02 drive would never generate more than 10. After doing a positional radial check (fine) and a head alignment check (head 0 and 1 were way off from each other and head 0 was on a crest of the stepper motor (the part where you are between steps, highly unstable). Adjusting that so head 0 and 1 were in a valley on the stepper motor (inherently stable) the drive was much quicker but still would generate about 80 errors. Odd. So on a lark I swapped the head amplifier module from the good drive to the suspect drive. Bingo, 10 errors. So the issue is in the head amplifier, maybe the voltage was too low. Next step was to check the read signal amplitude: Because I have a reference drive I decided to check the signal voltage at track 0 on the reference drive, then move the same pack to the problem drive and verify. On the reference drive track 0 has a signal value of a smidge below 1.5 volts on head 1. On my suspect drive the signal value was 1v. Adjusted it up to 1.5 volts and errors went down to 9. Not bad. Went up to 1.6 volts and errors went down to 6. Hm. So a question: Is it a problem to adjust the read amplitude up, and if so how far can you go. The manual says 2.25, is there a benefit of running up that high? More important, does adjusting the read amplitude also change the write current through the heads? That could result in a pack that may be readable, but will be a mess when written to. What would be nice would be to have a blue amplitude reference pack, but I don't have one of those. Also I haven't tried any other packs in the suspect drive, but maybe I should adjust the amplitude in my reference drive as well. Thoughts? C (All readings done with a tektronix scope. I haven't checked the calibration in awhile, but it should be reasonably in sync)

6 years, 4 months

Commodore PET interfacing description.

by mark.tapley＠swri.org

All, Another thing that surfaced recently on my pile is a manila envelope containing a big photocopied stack of papers, with a title page saying: ? Interfacing the Commodore PET by Bill Durham, David Paul, and jim Wilman University of Arkansas. ? It?s got about 45 pages of text, interspersed with block diagrams showing chip in/out signals and snippets of BASIC code, then a repeat of all that, then a copy of the 6502 instruction set and copies of multiple data sheets for various integrated circuits. Thought I identified an interested party on the list, but no response to PM, so offering it to all. Free to a Good Home, usual terms, first response unless I hear from Al K. before I ship in which case he gets it instead. - Mark 210-522-6025 office 210-379-4635 cell

6 years, 4 months

Apple II DOS User's manual

by mark.tapley＠swri.org

All, next thing in my disposal pile. 3-ring binder, containing a repro copy of the subject line and a 5.25? floppy labelled ?Apple II DOS 3.3 System Master For Apple II, II+, and IIe?. computer is given away a while back, should have sent this with it. I bought it in 2006 and won?t use it. I think all reproductions, not originals. FTGH. - Mark 210-522-6025 office 210-379-4635 cell

6 years, 4 months

KCC and parenthesis in preprocessor lines

by dave＠661.org

I'm having some trouble getting Frotz 2.50 ported to TOPS20. Version 2.32 with dumb interface compiles fine under KCC. With 2.50, there are several preprocessor lines that include parentheses. For instance: #if UINT_MAX == (1UL<<32)-1UL typedef unsigned int uint32; #else typedef unsigned long uint32; #endif What's a better way of accomplishing this? -- David Griffith dave at 661.org A: Because it fouls the order in which people normally read text. Q: Why is top-posting such a bad thing? A: Top-posting. Q: What is the most annoying thing in e-mail?

6 years, 4 months

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