test-drb

test-drb@ccmp.vtda.org

101090 discussions

by headcase＠eclipse.co.uk

When collecting vintage/classic computers it would seem to me that the apparently much sort after Altair 8800 is the Model T to the Intellec's R.R. Silver Ghost. At the time - 1974 - I thought the Altair was a very very cheap copy of my very very very expensive Intellec - and I still do! But then I would, wouldn't I? Have I fallen for all the eBay hype or have I've been wrong all these years? Jim Bunting - headcase(a)eclipse.co.uk M.V. Great Gull, Double Locks Hotel, Canal Banks, Exeter Ship Canal, Exeter, Devon, U.K. EX2 6LT. Phone No. 44 (0) 1392 493311 (On Board)

27 years, 10 months

AY 3500

by ckaiser＠oa.ptloma.edu

A non-text attachment was scrubbed... Name: not available Type: text Size: 528 bytes Desc: not available Url : http://www.classiccmp.org/pipermail/cctalk/attachments/19981023/99150e56/at…

27 years, 10 months

More thoughts on building a Z-80 (64bit!!!)

by allisonp＠world.std.com

< Wire wrap?...hmmm I have problems with that in ohmic losses even the < connections is good, soldering them helped a bit but no dice. Huh? I have 6 cards, s100 protoboards with about 25-40 pieces of mos and TTL on them that I wrapped in 1981 still running. Ohmic losses? What were you doing wrong. Remember #30 is for signals not power! < Have data transfers done with DMA, all memory mapped and irq driven < to knock subCPU as needed to grab data then place it in CPU's lap. < Leave CPU alone for processing. How about that? Those 6 boards built a multi z80 system with DMA and slave processors for things like IO and disks. It helps but the z80 bus is so busy that it's very hard to slip inbetween cycles so you steal cpu cycles by holding it off with BUSRQ/. Z280, z8000 and Z380 use burst mode access to the bus so that other devices can get in and get a few cycles without holding up the cpu. Even with slaves you reach a bottleneck between memory management and overhead to move data around. Still the results with 6mhz z80s were enough to blow away 386/16 class machine for text oriented applications. Allison

27 years, 10 months

PDP-11/70 rescued!

by Innfogra＠aol.com

What third party Unibus disk controllers are you looking for. I may have some non DEC controllers. I also have an HSC50, 5 RA81s, an RA60 and a TU 81+ in Portland Oregon that I am interested in selling. I think I have a couple of Eagles for sale too. I also have a VAX 730 with R80 & RL02 for sale. Paxton

27 years, 10 months

PDP-10 arch question

by franke＠sbs.de

> < What machines have had bit pointers? > 8051. There may be others. Wasn't the 432 able to adress whole Objectspace as Bits ? Gruss H. -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

Starting from Scratch (was Re: OT: Modern college educa

by franke＠sbs.de

>> Wow - thats it - I 've been already eaten up by megagraphics. >> So, anything I could Imagine was to reduce graphics to ASCII >> ... but Yo thats it Hamurabi ! >> Where is my copy of '101 basic games' ? > Mine's at home, but I do happen to have a version I ported to the PET > in 1978 that is sitting right here on my SPARCstation disk. I've got > xpet, and a directory full of my old tapes that I converted to .d64 > emulator disk format. I'd post HAMMURABI.BAS, but I suspect that more > than one person would get annoyed. If anyone _really_ wants a copy, I > can provide one. It depends on logical statements working as follows: > The statement C=(A>B) would set C to 0 if A weren't greater than B, and > would set C=-1 if A were greater than B. Not all micro BASICs support this. > I'm pretty sure Applesoft is onethat does _not_. Hmm shure ? I have to admit that I don't remember (stupid meone). But I think it will . After all Applesoft is jsut another MS-Basic. I'll try as soon as I'm back home. I'll post the result. Gruss H. -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

Bid list

by Innfogra＠aol.com

In a message dated 10/23/98 5:54:04 AM Pacific Daylight Time, dburrows(a)netpath.net writes: << > BURROUGHS > >23879724 G 300 VIDEO BOARD ET110 $5 ?Terminal cards for a 8 bit PC? >283531-006 G 2 1351 CONT CCA ??? don't know what it is These are Color Graphic Adapters for the PC ISA bus >2993-0666 G 295 WER SUPPLY $5 to $8 >3388-7498 G 169 KEYBOARD ASSY $5 >AP1351 G 5 PRINTER, AP 1351 If this is a complete printer $10 to $15 Small serial printer, 9 pin dot Matrix. >B28CPU G 1 CPU I think a 286 CPU for the Convergent Engine series, small box computers. It may need drives to make it work. >E2817B39-HT G 62 CRT $5 considering that they will have to pay to dispose of to meet EPA regs. >ET-1100 G 9 TERMINAL $5 to $10 Disposal costs as above. > >Any ideas? >> More terminals than I care to deal with. Be carefull with you bidding, there can be a lot of bulk wiith this stuff. Bid slightly over the scrap price unless you can't live without it. If you can't live without it bid 30% maybe. Watch your quantities. Paxton

27 years, 10 months

Starting from Scratch (was Re: OT: Modern college education

by franke＠sbs.de

> You play the game like this: > 1) Scout for a surface deposit of Coal and start mining coal. > 2) Scout for (surface) deposit of iron ore and start mining ore. > 3) Using Coal + Ore build Pig Iron > 4) Using Pig Iron build picks and shovels to increase your > mining efficiency. > 5) Build Smelter/Foundry > 6) Locate lime and concrete develop cement. > 7) Collect Sand and use with cement to build an iron casting apparatus > 8) Using the sand casting build a steam boiler and steam engine > 9) Using the steam engine and iron casting build metal stamping > 10) Using Steam engine and metal stamping build rail road. > 11) Start mining below ground and locate Copper. > 12) Build a copper foundry. > 13) Using metal stamping build wire puller (makes wire) > 14) Using iron, and wire build generator. > 15) Using generator create electricity. > 18) Mine tungsten and build lightbulb. > ... > First one to a PDP-8 wins :-) What about creating a Game ? Of course all Graphics has to be ASCII :) Gruss H. -- Ich denke, also bin ich, also gut HRK

27 years, 10 months

More thoughts on building a Z-80 (64bit!!!)

by allisonp＠world.std.com

< WIRE_WRAP!?!?!?! ICK! I usually pull out my cheapo PCB CAD program.... < A little laser-printer transfer plastic and an exacto-knife. the best you can do with that is two sided and that might run at 25-40MHz and that's pushing. < I cannot believe that there can be so many extremely complex processors < there running up to 667Mcyc (Alpha) and there not be any simple controll < with far less transistor counts that match or exceed those speeds. < There is no way we can get 600Mcyc clock speeds out of a 10,000,000 < transistor chip but can't get at least that out of a 100,000 transistor < chip. It all that complexity that permits parallelism of functions. The simpler machine are limited by the very direct and limiting propagation delays of gates. < As for the Z-80 vs Alpha features.... I like: < < 1) I/O ports. I hate the memory map stuff. (yes, I know it is the wa < things are done now) Memory mapped ops even with Z80 allow you to do things like OR data with a device or AND data from a device or use the BIT ops to test a bit in the device. None of which the IN or OUT can do directly. when you only have 64kb memory mapped hurts some. When you have 4Gb so what if you give up a meg to memory mapped IO. FYI the PDP-11 is also memory mapped and uses it to very good advantage! < (((((((THE Z-BUS!!!)))))))) (not the Z380 bus, that's almost as hosed a < the Alpha bus). < Do the Z-80 bus but with the data size control lines that I explained < above.... (or keep a 64 bit data bus and run a local bus into a 'DMA' (f < a lack of a better word)... Wait! A bus mastering device!!!! (<-- bett < word).) Zbus give advance status of the transaction to occur, that information is handy for tweeking the memory to make it get there in time instead of wait states. Z80 bus has a high bus bandwidth and poor bus utilization and this shows up when you have DMA peripherls. I'm not bombing z80, I happen to like it and have used it for 20+ years! I'm realist enough to know it's limitations and weaknesses and I can understand why the z380 is the way it is. Personally I happen to like the z280 as the user/system spaces make the 64k limits far easier to work with and also offers some speed with the 16bit bus, cache and a paged MMU while not locking the bus. The Z180 is a good compromize and easy to work with at low speeds, at 20+mhz it's a bear as the world around it has to keep up. It's not like using the z80 at 4 or 6mhz any more when you notice that the decoding dealys and the buffering delays are are a significant part of the system timing. Allison

27 years, 10 months

Book Source

by rax＠warbaby.com

A while back, someone posted a great source for used and out of print books. I've lost the URL and can't remember the name - could someone please repost it? Thanks R. -- Warbaby The WebSite. The Domain. The Empire. http://www.warbaby.com The MonkeyPool WebSite Content Development http://www.monkeypool.com Once you get the nose on, the rest is just makeup.

27 years, 10 months

Jump to page:

2026

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

test-drb