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101090 discussions

COMBOARD (MC68000) hardware hacking (was Re: Solderless breadboarding)

by ethan.dicks＠gmail.com

On 2/18/10, Henk Gooijen <henk.gooijen at hotmail.com> wrote: > I have no experience with SCSI chips... No harder to wire up than a UART or PIA/VIA, but the rest is all software to create/interpret the SCSI packets. > but the software to read and write a sector of an IDE disk is simple enough. I've written low-level driver code for IDE manipulation on a GG2 Bus+ equipped Amiga. > A TTL-based interface would > take not much time. 16 bit data (may need buffering) and a few address > decoding gates is probably all you need to hook up an IDE drive. Address decoding gates might not even be required - I have full schematics for this board (I used to make them commercially) and have the PAL equations for the memory map PALs. I think it could be as easy as buffers and a PAL swap (plus software). I just flip-flop between SCSI and IDE and never get started. -ethan

16 years, 2 months

Soldering (Was: Re: HP-IB, Amigo/cs80 ... )

by mtapley＠swri.edu

At 15:26 -0600 2/17/10, Tony wrote: >What I don;t get is _why_ there's this aversion to soldering. I get it. Fumes requiring ventilation, molten metal, temperatures that can sear flesh or melt most plastics, the appearance if not fact of irreversability (and in fact, it's not hard to do damage to the circuit board that is hard to repair). Like bicycling, cooking, and a host of other activities, it's a very productive and useful skill to have, and seems to those who have the skill to be trivial to learn - but to those without the skill, it's intimidating (partly because there is some potential for damage if it's done wrong). I think this is a good case where mentoring or tutoring would *really* help people who have not done it to "get their feet wet", and have the confidence to do more on their own. -- - Mark 210-379-4635 ----------------------------------------------------------------------- Large Asteroids headed toward planets inhabited by beings that don't have technology adequate to stop them: Think of it as Evolution in Fast-Forward.

16 years, 2 months

Printronix

by jws＠jwsss.com

There is a load of printronix printers, and parts coming off service in St. Louis Mo P300 P600 I suspect, if anyone is interested please email me, and I'll pass it along. There is at least one QMS board equipped system involved from what I have been told. Inventory can be made if interest is there. Jim

16 years, 2 months

hp 9153 floppy & disk

by hp-fix＠xs4all.nl

-----Original Message----- From: e.stiebler <emu at e-bbes.com> Sent: 10 februari 2010 ?. 02:27 To: On-Topic and Off-Topic Posts <cctalk at classiccmp.org> Subject: Re: hp 9153 floppy & disk Tony Duell wrote: > THe Nighthawk drive interface is strange. Very strange. it has the raw > data signals of an ST412 drive (but on single-ended TTL lines, not > differential pairs). It also hasa the strangest positioner interface > you're likely to see. The positioner is a 2-winding stepper motor. You > get (at the drive interface) to contrtoll the currents through the > windings (there's a dual DAC in the drive).You also get soem kind of > position feedback signal from the drive (there's an ADC in there too). > There is no intellegence in the drive to control te DACs based on the > output from the ADC, that is done in the controller (I assume in part by > the 6809 firmware). > > Given there's an undocumented ASIC in the drive too, which has a register > accessible over the interface, and for whaich I have no data, tryign to > recreate the drive is going to be a big job. So, what you're saying is, that I should get myself a microcontroller with an sd-flash and start programming Amigo/CS80 ? And simply forget about the box I have here ? ;-) Cheers You could use HPDIR with a sbc with hp-ib and a flash drive. I'm building one with a Kontron SBC. -Rik

16 years, 2 months

Tango Schematic capture, PCB layout and autorouting programs

by cj7285＠comcast.net

I read a message that you posted at some time or another and got your email from it I am in desperate need of some tango pcb info I have an old copy of tango pcb installed on my comp and some old layouts I desperately need to access/modify I have lost my dongle. Can you tell me where I might purchase one? Or even better: I understand they just shorted some pins on a parallel port connector, any idea what the pinout is? My name is Carl Hesse. I am in denver colorado I would pay reasonably well for pinout info What this means is that I just need to know which pins are shorted or "common" on the dongle any desire to help?

16 years, 2 months

Looking for Aztec C

by silvercreekvalley＠yahoo.com

Does anyone have a copy of Aztec C for the Apple // that they wouldnt mind selling. Looking for an original copy. Please reply off list. Thanks! Ian

16 years, 2 months

book conservation info: slightly off topic

by useddec＠gmail.com

I am not saying that any of my books are rare, and that is not the point of this, but I do want to preserve them. Most are non-fiction, some are from the 1800's, and a few were piblished by MIT. After being in storage for a few years during rebuilding, some have mold and or dirt on them. I wanted to clean them properly, and contacted the Rare Book Library at The University of Illinois. They were kind enough to send me the following links. I have not read through all of them yet, but I thought this might be useful to some list members Hello, XXXXXX asked that I send you a list of resources to aid you in your conservation needs. The following sites offer comprehensive and easy-to-follow guides: http://www.nps.gov/history/museum/publications/conserveogram/04-09.pdf http://www.nps.gov/history/museum/publications/conserveogram/03-04.pdf http://www.mnhs.org/preserve/conservation/bookspaper.html http://www.conservation-us.org/index.cfm?fuseaction=Page.viewPage&pageId=49… http://www.loc.gov/preserv/familytreasures/ http://www.nedcc.org/resources/resources.php This is extremely in-depth and may be above and beyond what you are looking for: http://cool.conservation-us.org/coolaic/sg/bpg/pcc/12_mold-fungi.pdf Thanks, Paul

16 years, 2 months

Teaching soldering skills

by marvin＠west.net

> On 2/17/10, Tony Duell <ard at p850ug1.demon.co.uk> wrote: >>> >> From trying to teach soldering, the >>> >> unforgiving nature leads to student frustration. >> > >> > I am suprised. I've taught dozens of people to solder over the years, and >> > every one had success within half an hour. > > More particularly, I've taught several people over the past few months > how to solder at a few workshops. I've had mixed results. All were > enthusiastic, but not all were, in the old vernacular, "mechanically > inclined". A friend of mine was a 3rd grade teacher, and one or two of us would go in and help them build code practice oscillators. We really didn't have much trouble with solder joints after we showed them how to preheat the joint and apply the solder. The biggest problem at first was getting them to touch the tip to the joint long enough to heat it to the point the solder would melt when applied. The second biggest problem was getting them to realize that the color codes on the resistors actually meant something as to where they were inserted :).

16 years, 2 months

Teaching soldering skills (was Re: HP-IB, Amigo/cs80)

by ethan.dicks＠gmail.com

On 2/17/10, Tony Duell <ard at p850ug1.demon.co.uk> wrote: >> From trying to teach soldering, the >> unforgiving nature leads to student frustration. > > I am suprised. I've taught dozens of people to solder over the years, and > every one had success within half an hour. More particularly, I've taught several people over the past few months how to solder at a few workshops. I've had mixed results. All were enthusiastic, but not all were, in the old vernacular, "mechanically inclined". What would probably have helped is an aspect of the workshop that was specifically soldering instruction, not kit assembly, with easy to reach and easy to inspect widely spaced joints. What we had at our disposal was a few joints on 0.1" boards - either a made-in-class PCB (not my design, or I'd have made the pads bigger which would have helped) or a factory-made strip-board (Lilypad prototyping board) that was soldered to after the web of interconnections were cut to route the signals. All of the students learned *something* about soldering, but even after 90 minutes and several attempts, the success rate (good joints) was probably between 50%-66%. I had to retouch a number of joints to get the projects working during the class period. More practice would have obviously been beneficial. -ethan

16 years, 2 months

Long persistence tube for vt100

by emu＠e-bbes.com

Hi all, any source for a replacement tube for a vt100 type terminal ? Specially, a long persistence phosphor type (vt640, retro graphics) ? Cheers

16 years, 2 months

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