test-drb

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101090 discussions

by afahimi＠alumni.usc.edu

Mark, There were a number of IBM branded development tools at that time. There were at least two versions of MASM, C, and FORTRAN not to mention the BASIC compiler. As for contemporary to DOS 3.3 I am not a 100% but they would have been current if not just the last release. Ali -----Original Message----- From: cctalk-bounces at classiccmp.org [mailto:cctalk-bounces at classiccmp.org] On Behalf Of cctalk-request at classiccmp.org Sent: Wednesday, August 27, 2014 9:00 AM To: cctalk at classiccmp.org Subject: cctalk Digest, Vol 132, Issue 56 Send cctalk mailing list submissions to cctalk at classiccmp.org To subscribe or unsubscribe via the World Wide Web, visit http://www.classiccmp.org/mailman/listinfo/cctalk or, via email, send a message with subject or body 'help' to cctalk-request at classiccmp.org You can reach the person managing the list at cctalk-owner at classiccmp.org When replying, please edit your Subject line so it is more specific than "Re: Contents of cctalk digest..."

11 years, 11 months

Facit N4000 User Manual

by dave＠willomail.co.uk

Hi Folks! Recently picked up a nice Facit N4000 paper tape reader / punch and was wondering if anybody had a user manual for this unit? Cheers, Dave

11 years, 11 months

PDF of "Introduction to VAXELN"

by robert.jarratt＠ntlworld.com

I have found a site that contains the pages of this book here: http://odl.sysworks.biz/disk$vaxdocsep953/decw$book/d33vaa48.decw$book I would rather have my own local copy. Does anyone have this in PDF form by any chance? Regards Rob

11 years, 11 months

Making images of old CDs

by commodorejohn＠gmail.com

> From: Peter Corlett <abuse at cabal.org.uk> > > Hi, > > The recent thread on AB20 reminded me I have a large pile of CDs from the > 1990s > that could do with being imaged and uploaded to archive.org. Ooh. Please share the link when you do get 'em up :)

11 years, 11 months

Some Altair questions, if I may..

by drlegendre＠gmail.com

I haven't had a chance to catch up on the new posts, way busy. But I +did+ fix the permissions issues with my info archive at http://nerp.net/~legendre/altair. Need to pay more attention to permissions when using scp.. Steve's new 4K DRAM schematics will be there in a moment, thank you, Steve. On Wed, Aug 27, 2014 at 11:03 AM, Bill Sudbrink <wh.sudbrink at verizon.net> wrote: > > -----Original Message----- > > From: cctalk-bounces at classiccmp.org [mailto:cctalk- > > bounces at classiccmp.org] On Behalf Of William Donzelli > > Sent: Wednesday, August 27, 2014 11:20 AM > > To: General Discussion: On-Topic and Off-Topic Posts > > Subject: Re: Some Altair questions, if I may.. > > > > > At a previous employer where we were doing *bringup* of new > > processors on > > > new hardware (Intel Core2 stuff...before the memory controller was > > integrated > > > in with the CPU) we had a "front side bus analyzer". It was "double > > pumped" > > > and running at 800MHz (so logically it's running at 1.6GHz). As I > > recall that > > > analyzer was in the high $100,000s (ie pushing $1,000,000). > > > > And in 20 years, that same item will be a $100 hamfest special. > > With the pods and data cables missing. Where the h*** do they go? > > >

11 years, 11 months

TTL source/sink currents and LEDs (was Re: Some Altair questions, if I may..)

by spacewar＠gmail.com

On Sun, Aug 24, 2014 at 2:06 PM, Tony Duell <ard at p850ug1.demon.co.uk> wrote: > This is quite a nroaml way to do it. A TTL output can sink a larger > current tahn it can source, By which Tony means "can sink a **MUCH** larger current than it can source". If you look at the spec for the TI SN7404, the difference is a factor of 40: max -0.4 mA source (high), vs. max 16 mA sink (low). Generally speaking, 0.4mA is nowhere near enough to be usable for an LED, so driving the low side of the LED was the only practical approach with normal TTL. Even the max sink spec of 16mA wasn't enough to drive a typical mid-1970s red LED very brightly. For example, a Monsanto (later GI) MV5020 red LED at 20 mA would only give you 2.0 mcd typical (and 0.6 mcd minimum!). That very low source current spec (-0.4 mA) is about the same for all true TTL families, excepting some buffer parts that are spec'd able to source more current. Modern CMOS parts tend to have closer or even identical source and sink limits, so it has become somewhat more common to see high-side drive for LEDs, though many designers have stuck with low-side drive out of tradition. Many modern LEDs are also much more efficient than those from the 1970s, which is partially because different chemistries producing lower wavelengths are commonly used for red, e.g., 620-340 nm vs. 660 nm, and the human eye is significantly more sensitive to the lower wavelength. However, the modern chemistries are also more efficient in terms of absolute light output per current. A representative modern T1 3/4 LED with comparable spatial distribution to the MV5020 is the Cree C503B-RCS-CW0Z0AA1, which has a typical wavelength of 624 nm, and typical luminous intensity of 5100 mcd (minimum 3000 mcd) at 20 mA. When comparing LED specs, it is important to look at the spatial distribution. A narrow viewing angle LED will give higher luminous intensity but only on-axis. Eric

11 years, 11 months

Test Loads for Power Supplies

by robert.jarratt＠ntlworld.com

I have some machines which I have had a while and which I have yet to power on. I am a little wary of just switching them on and hoping they will work, being concerned that if they are not right they may damage something in the machine. Since a switched mode PSU needs a load to work properly, what do people use as a dummy test load for power supplies? I was thinking of building a small board with a bunch of resistors on it and suitable connectors (particularly the molex one common in most PCs). Maybe switchable in some way to vary the amount of power consumed. Good idea? Would it make sense to test the outputs of the PSU (for voltage and ripple) just at the minimum power, or would it make sense to test the maximum rated power consumption, or perhaps both? I believe there are test instruments for this kind of thing, but that they are very, very expensive. Regards Rob

11 years, 11 months

OT: Inexpensive & available plug-n-play WiFi for Linux

by drlegendre＠gmail.com

Working on the assumption that there is a fair amount of Linux / OSS users on the list.. Support for WiFi hardware has long been a thorn in the side of Linux users - what product to buy, which chipset will it have, will it actually arrive with the correct rev of the correct chipset, will the latest kernel support it, etc etc. But I've come across a line of product which works so well I have to put it out there.. It's the stuff based on the RALINK RT-5370 chipset. So far all I have are USB-based adapters, but they are 100% plug-n-play under recent Ubuntu OSes and seem utterly bulletproof. Fast, too! I have tried both the tiny white 'chicklet' adapter as well as the more conventional type with an external antenna, and both types perform beautifully. They can be had for as little as $3.65 +shipped+ from China, or around $8.95 from US sellers. I now own three. Literally stunned at how well they work - plug it in, type in your network pw and go. As I understand it, the chipset mfr. opened the specs for the Arduino developers, and the adapters are targeted at Arduino users - at least that's how they're advertised on eBay. But they sure work fine in my commodity PC hardware.. What a pleasure!

11 years, 11 months

Test Loads for Power Supplies

by marc.verdiell＠gmail.com

I use 10 Ohm 10 or 25W resistors, 2 or more of them in parallel, depending how much current you want to draw. They look like white rectangular bars. They have them on the shelf at my Fry's electronics store. For what it's worth, on the latest power supply I tried, just one resistor was not enough to start the supply, I needed 2 to draw at least 1A from the 5V and then it was OK.

11 years, 11 months

Portable Facepalm II

by nf6x＠nf6x.net

I'm working on a Kaypro II that I recently bought. The poor thing has suffered at the hands of a previous owner. Among other indignities, the brightness control and reset button were relocated from the back panel to the front for easy access. It appears that the brightness control was just a potentiometer in series with the unshielded video cable between the main board and monitor (assuming that the previous owner just moved it, and didn't change the overall design). The original wires weren't long enough, so he soldered a few feet of small-gauge speaker cord onto the potentiometer, and then spliced it to the video cable with wire nuts. Wire nuts. In the video signal path. WIRE. NUTS. Big orange ones. In the video signal path. I'll make a blog post soon with pictures, but I just couldn't wait to share this. There are several poorly-soldered patches on the mainboard that I'll need to look into to determine if they should stay. One of the lifted pins has broken off, so I'll be doing some repairs for sure. The front panel also grew a toggle switch which is connected to a small board plugged into the CPU socket, with a Z80B and a few other chips on it. The board is marked "(C) 1983 ADVENT PRODUCTS, INC.", and I'll want to figure out what it does so I can determine whether it's something that I want to keep in there. Another mod (?) is a ROM chip marked "Kaypro 8 PRO MONITOR (c)1984 Micro Cornucopia". It has a lifted pin and a badly-soldered wire attached. The machine arrived with some of the internal cables disconnected, and I'm not ready to try applying power to it yet. -- Mark J. Blair, NF6X <nf6x at nf6x.net> http://www.nf6x.net/

11 years, 11 months

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