test-drb May 2001

test-drb@ccmp.vtda.org

273 participants
642 discussions

by Lee.Davison＠merlincommunications.com

> I found a dozen or so Xilinx protoboards, size of a punch card half of it > open, 2 digit display, couple buttons, some kind of serial looking > connection, runs off a 9v battery, big socket in the middle > with a square chip in it of the same name. It's an XC4003A demo board and it came with tools, demo projects and a cable to hook it to your PC to program it. The idea was you could see how easy FPGA use was and then you'd buy 1000s of them for your next project. I have the chip datasheet, it's available from freetradezone.com > Who wants one for $5 and shipping, on the condition they figure out what it > is and report back? Do I qualify for the $5 card? 8^)= Lee. ---------------------------------------------------------------------------- ---- This email is intended only for the above named addressee(s). The information contained in this email may contain information which is confidential. The views expressed in this email are personal to the sender and do not in any way reflect the views of the company. If you have received this email and you are not a named addressee please delete it from your system and contact Merlin Communications International IT Department on +44 20 7344 5888. ________________________________________________________________________ This message has been checked for all known viruses, by Star Internet, delivered through the MessageLabs Virus Control Centre. For further information visit: http://www.star.net.uk/stats.asp

23 years, 7 months

Allison: 2910c version of z80 and FPGAs - a little O/T

by ajp166＠bellatlantic.net

From: Richard Erlacher <edick(a)idcomm.com> >There's been so much unwarranted (IMHO) skepticism about the ability to transfer >a solid DEC CPU design into CPLD/FPGA that I'd really like to see someone try >it. The DEC folks didn't often do the wierd things that make circuits act There are several PDP-8s outther on FPGAs and there is nothing to say others would not be doable save for maybe enough gates (CPLDs) to do the job. >fix the older designs so they'd work fine in current technology, and probably >MUCH faster. I'm not interested in DEC stuff myself, but the fact that there Potential for speed is definately there using newer technology. >are several manufacturers making logical equivalents of the DEC CPU's today Well most of them are doing it from DEC mask sets under license. I presume you mean Alpha and PDP-11 (11/93 class). >yield 150), you'll get it done. Once the design is entered, simulated, >synthesized, simulated and tested as implemented, there's room for fixes. The If you dont simulate and test the sim you will likely fail. Allison

23 years, 7 months

ewy

by Demon02554＠aol.com

if ewy sees this email me...i lost your address thanks, Robert Cobbins

23 years, 7 months

Allison: 2910c version of z80

by ajp166＠bellatlantic.net

From: Chuck McManis <cmcmanis(a)mcmanis.com> >tools are *free*. You do have to take the time to learn VHDL but so far the >payoff has been worth it for me. I'm having a blast with this thing. My VHDL.... that was the cost I refer to. Most of me design experience is pre VHDL availbility. I already have the Lattice Synario and that bends my mind greatly. I havent used the small 2064 and 3030 FPGAs I have a good handful of yet. Time is costly for me these days. >"final" is a PDP-8 w/ Serial terminal (think DECMate in a single chip) with >full lights and switches. This chip can do that easily. I don't think it Major cool. My personal "I'd like to do" is a 32 bit wide '8 by grafting another 20 bits to the right side of the word and running it fast. Same instrcution set and the left 5 bits would remain the same. I'd use all 32 bits for OPR instructions to eliminate decoding (one per bit) and simplify the IOT interface some. Obviously the page (formerly 128 words) would be much bigger but direct addressing of 256MW out of a 4gb address space wouldn't be a significant shortcomming. I doubt I'd need to do the EMA. ;) Allison

23 years, 7 months

How many transistors in the 6502 processor?

by Lee.Davison＠merlincommunications.com

>I've never heard of mos-multi-emitter-transistors Just etch multiple mos structures and have a common gate. Tie drains and sources as required. Lee. ---------------------------------------------------------------------------- ---- This email is intended only for the above named addressee(s). The information contained in this email may contain information which is confidential. The views expressed in this email are personal to the sender and do not in any way reflect the views of the company. If you have received this email and you are not a named addressee please delete it from your system and contact Merlin Communications International IT Department on +44 20 7344 5888. ________________________________________________________________________ This message has been checked for all known viruses, by Star Internet, delivered through the MessageLabs Virus Control Centre. For further information visit: http://www.star.net.uk/stats.asp

23 years, 7 months

Fwd: Classic Computer Collection

by jhellige＠earthlink.net

Here's an email I received this morning that I thought I"d pass on. If interested, please reply to the original sender. Jeff >Status: U >From: "gen" <gen(a)webline.plus.com> >To: <jhellige(a)earthlink.net> >Subject: Classic Computer Collection >Date: Sun, 6 May 2001 15:44:58 +0100 >X-Priority: 3 > >Hi there > >I got your email address from the internet. > >I have a substantial collection of 'antique' computers, mostly 'first >editions' of systems such as Apple, IBM, Sirius, Apricot, Macintosh, Epson, >etc. These are not old and used, they are in pristine condition in their >original boxes with manuals, software & literature. In particular I have an >original Mac (128), 512K, MacPlus, 1st Mac II, Apple //e, //c, software, >collectables, etc. >Would you know of anyone interested in buying any of these items? I am >based in the UK. > >Regards -- Collector of Classic Microcomputers and Video Game Systems: Home of the TRS-80 Model 2000 FAQ File http://www.geocities.com/siliconvalley/lakes/6757

23 years, 7 months

For Trade: PDP-11/23

by norm.anheier＠pnl.gov

I have a PDP-11/23 in a BA-23 enclosure (for example see: http://www.telnet.hu/hamster/pdp-11/kepek/updp1123.jpg). I rescued this >from a recycler. Anyone interested in this, I don't collect full systems -- yet! I am willing to part this out if you need something specific. Unfortunately the case is cracked and the front and back bezels and the processor and coprocessor chips are gone. Everything else is there. I have no idea what components are functional. It would be great if someone has some use for this, otherwise its going back to the recycler. Any trades for oldprocessor chips would be appreciated. Also, I frequently see old minicomputers, such as the PDP-11 at the scrapyard. I have no idea what is common and what is on everyones most wanted list. Anyone have any pointers to such a "most wanted list"? Thanks Norm

23 years, 7 months

Allison: 2910c version of z80

by ajp166＠bellatlantic.net

From: Richard Erlacher <edick(a)idcomm.com> >3000A and 3100 series. My old XACT tools unfortunately don't support it either, >however, as the tools I bought only went through the 2K series. I've been >unable to find the dongle for that, however, though I don't miss it. The copy of XACT and earlier tools I can use for the 2064s runs fine on dos wothout a dongle. >The OS under which the XILINX tools seem to run best, at least according to >their tech support folks, is Win98, though they claim it runs just as well under >NT4. I see essentially no difference, myself. There are new tools for LINUX, I've run Synario under W95 and WinNT4 without problems. >by the way, though I don't know how well they work or are supported at XILINX. >They are VERY generous with support, however, once you've bought into their >tools, even though I only bought the cheapest set. Yes, they are good but not so cheap. >I'd not be afraid to give the SPARTAN series a try for building an experimental >version of a '70's-'80's generation CPU. They are relatively (choke) >inexpensive and available in versions with sufficient on-board RAM that you >might not need the higher pin counts required to interface external memory. >Unfortunately, the high-pin-count parts are hard to prototype. The real problem is making/buying a protobaord for the high pin count, that and time to actually do it. I know there are plenty of parts out ther that can and many different tools. Allison

23 years, 7 months

How many transistors in the 6502 processor?

by ajp166＠bellatlantic.net

From: Brian Chase <bdc(a)world.std.com> >Nice, now if I could only get enough info to implement one in TTL. :-) >Silly, yes, but it would be a fun project. Well you know the timing, instruction set, internal organization and register set... what else do you need? Granted VHDL would be nice but the internal circuit schmatics as built are anything but TTL. The biggest difference from the mos version going ttl would likely result in is a static register cells instead of dynamic making the result fully stopable. Allison

23 years, 7 months

Allison: 2910c version of z80

by ajp166＠bellatlantic.net

From: Heinz Wolter <h.wolter(a)sympatico.ca> >AMD did have an Ap note on the 2901's that described >a then fast (I think about 4mhz) version of the 8080. At 4mhz that was 2x standard 8080 speed. Hitting 8mhz with (the 1981 parts) with 2901s as Z80 was hard and that was only 2x. Within a year (1982) there would be 6mhz z80s and by 1984ish 8mhz z80s. >IDT later made much faster versions of the 2901 and 2910- >in CMOS and they were I recall about twice as fast. 2901's Foo, the 2910 was only soso. Would have liked a faster 2902 or 2911. >a nice Virtex or Spartan fpga will fit a whole processor >with up to 1mbit or sram on chip. Far more interesting, out of my range of tools to do. Allison

23 years, 7 months

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test-drb May 2001