test-drb April 2018

test-drb@ccmp.vtda.org

128 participants
123 discussions

by pete＠petelancashire.com

3 x DEC Alphas, small deskside models 5 to 6 x Sun pizza boxes one a Sparc 1 prototype 029 IBM Keypunch The day I can have a 15 cubic yard scrap metal drop box the stuff will start to be tossed in. All based on when the rains stop and the ground is hard enough I can't want much longer For those that have not seen me post this before The stuff is near (3 - 4 miles outside of) Banks Oregon USA (look it up on Google). I CAN NOT LIFT OVER 10 LBS, PERIOD. -pete

6 years, 8 months

Manual wanted for the MFE M-700 Floppy-Disk-Drive

by harten＠injectstar.de

Hi to all! I'm looking for a technical manual/schematic for the Mayflower MFE M-700 8 inch Floppy-Disk-Drive. Regards Rolf

6 years, 8 months

new disassembler vs IDA (was Re: 8085 Dissasembly?)

by spacewar＠gmail.com

On Wed, Apr 18, 2018 at 8:17 PM, Mark J. Blair via cctech < cctech at classiccmp.org> wrote: > Some of the future reverse engineering projects I have on my to-do list > involve the CDP1802 processor, which IDA presently doesn't support. When I > get to them I'll have to decide whether to use dismantler vs. learning how > to add CDP1802 support to IDA. I'm leaning towards the latter, because IDA > is so much fancier than dismantler is. I'd vote for adding it to dismantler. I had an IDA Pro license at one point, but I seem to have misplaced it, and it is too old to get me any discount on a new release. I imagine that IDA has probably improved a lot since back then, but at the time it had a pretty awful user interface. If I had an actual business need to reverse-engineer something using a processor that IDA supported, I'd certainly buy a new IDA license, but I wouldn't personally invest any time in building add-ons for expensive commercial software, when there are open source alternatives that may not be as good, but are generally good enough. For the 1802, I've used a really crude disassembler written in C. The 1802 instruction set isn't very complicated, so a disassembler for it isn't either. It's been so many years since I actually disassembled 1802 code that I'm not sure I still have the disassembler around.

6 years, 8 months

Andromeda SCDC Qbus controller question

by dj.taylor4＠comcast.net

I just got one of these and wanted to configure it via the 10 pin RS232 port on the board. Is the port a standard DLV11-J type? I have one of those D-bit DLV11-J to DB25 adapters but not getting any response. Any info on the few jumpers on the board? Doug

6 years, 8 months

what happened to the dec thing with the butterfly discs never heard back I need it for museum thanks cindy ed

by couryhouse＠aol.com

what happened?to the dec thing with the butterfly discs never heard back I need it for museum thanks?cindy ? ?ed

6 years, 8 months

old schematics books

by sales＠elecplus.com

These have now been claimed. Thanks everybody! Sean I need an address please! Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com AOL IM elcpls --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

Speed now & then

by boris＠summitclinic.com

TAhanks for that link which fits with my measurements (nowhere as detailed) of ones actual ability to do things with "modern" hardware. In the 1980's I was used to being able to measure events with 0.2 microsecond precision using a PDP-11 and my expectation was that the accuracy was only going to improve as processors got faster. I ported a program I wrote on the PDP-11 to a Commodore 64 in 1988 and was using it to measure finger tapping with a switch array to 1 msec accuracy. This was done through the simple expedient of speeding up the sample rate for the keyboard to 1 KHz and the adding in my 4 external switches as "keys". Used a 512 K Mac to get the serial data and display results. To do the same now would require custom hardware to do the timing and a USB link to a "modern" CPU or implimentation on a microprocessor When I attempted to get this same type of timing accuracy from a PC, found out that it was no longer easy to get access to interrupts as easily as before and keyboard latency was longer as now keystrokes were detected by an on board microprocessor and sent out as a series of packets for each keystroke. In DOS and W95 where one could still easily get at interrupts, then a serial port could be used to do msec timing. Once XP and beyond arrived, then the best temporal precision one can expect from a 3 GHz machine is 15 msec. I suspect the same holds for Macs and haven't tried running real time Linux as I either pull out my trusty C64 from time to time and use it for precision timing (unfortunately have only one copy of the code on casette tape so when that goes can't do this anymore) or I use various microprocessors to do the job. Have a nice microsecond precision timer that I wrote for a Propeller chip and feel much more comfortable programming for it than the latest windoze bloatware system. The Propeller has the same amount of RAM as the PDP-11's I started on, runs 20x faster/core and is fun to program. The microsecond timer is attached to a geiger counter to generate random bytes for OTP encryption. Boris Gimbarzevsky >On 29 March 2018 at 19:53, Paul Koning via >cctalk <cctalk at classiccmp.org> wrote: > > > > It would be fun to do a "generalized Moore's > Law" chart, showing not just transistor count > growth (Moore's subject) but also the many > other scaling changes of computing: disk > capacity, recording density, disk IOPS, disk > bandwidth, ditto those for tape, CPU MIPS, > memory size, memory bandwidth, network bandwidth... > >This is the most telling I've seen in a long time... > >https://danluu.com/input-lag/ > >-- >Liam Proven ? Profile: https://about.me/liamproven >Email: lproven at cix.co.uk ? Google Mail/Hangouts/Plus: lproven at gmaill.com >Twitter/Facebook/Flickr: lproven ? Skype/LinkedIn: liamproven >UK: +44 7939-087884 ? ??R (+ WhatsApp/Telegram/Signal): +420 7002 829 053

6 years, 8 months

Last call for free old manuals

by sales＠elecplus.com

I have many cases of SAMS facts schematics and other repair manuals for everything from stereos, tube TVs, ham radios, turntables, etc. Most apply to equip from the 60s and 70s or maybe a little earlier. Free to a good home or they go in the recycle bucket tomorrow. Cindy Croxton Electronics Plus 1613 Water Street Kerrville, TX 78028 830-370-3239 cell sales at elecplus.com AOL IM elcpls --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus

6 years, 8 months

8085 Dissasembly?

by jnc＠mercury.lcs.mit.edu

> From: Charles Anthony > discovered that changing the executable would change the behavior -- a > heisenbug. Ooh, love that neologism. Noel

6 years, 8 months

TRS-80 bits

by wrm＠dW.co.za

Hi all I have a TRS-80 Model 2000 B/W Graphics board and a TRS-80 Card Cage kit (upgrade model 12 to model 16B) Are either of these worth shipping from the antipodes to anyone? W

6 years, 8 months

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test-drb April 2018