test-drb

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101090 discussions

by joe.lang.0000＠gmail.com

I'm trying to find docs for monolithic systems 8009 board. multibus I, z80, RAM ROM 2 serial, FDC. I see references to the board online but no actual docs. I'm looking for information (schematic) for the on board interrupt logic and bus interface. I've figured out enough to get CP/M 2.2 running on it but things like interrupts,bus time out and arbitration are implemented in PALs and defy my attempts at reverse engineering. Even docs from another model (800X) may prove useful since similar logic may be used. thanks joe lang

10 years, 10 months

cctech Digest, Vol 14, Issue 10

by clemc＠ccc.com

On Mon, Aug 10, 2015 at 1:00 PM, <cctech-request at classiccmp.org> wrote: > From: Brent Hilpert <hilpert at cs.ubc.ca> > > There was also AlgolW, supported on MTS. > > As MTS was being mentioned earlier I was going to ask if anyone knew > whether the AlgolW compiler was included in the available distribution. > ?The sources are available - they were googlable - send me a note off list and I can put together a tar image of what I have. FYI: It was written PL/360. I did some hacking on it under TSS years ago.? IIRC Wirth did AlgolW on the 360 at Stanford which was running one of the OS/360 flavors. CMU ported to TSS and Michigan to MTS. also check out: The Programming Languages Genealogy Project http://everything2.com/title/the+Programming+Languages+Genealogy+Project ?Clem?

10 years, 10 months

And speaking of ALGOL

by jnc＠mercury.lcs.mit.edu

> From: Paul Koning > Every machine needs a fast memory system. CISC machines just as much, > after all the number of memory references per operation of a given kind > doesn't depend on the sort of CPU architecture you use. You're forgetting the memory bandwidth for the instruction fetching. RISC machines execute a stream of simple, low-level instructions, whereas CISC machines tend to do fewer, (semantically) higher-level operations - and in the process, use less memory bandwidth for instructions. To be tedious (sorry), for example, instead of of the RISC instruction sequence 'move register Ra to Rt1; add constant X to Rt1; move mem loc (Rt1) to Rt2; add Rn to Rt2; move Rt2 to mem loc (Rt1)', a CISC would just do 'add Rn to mem loc X[Ra]'. Same number of _data_ reads/writes, but a very different count of instruction fetches. The CISC tradeoff (fewer, slower, instructions) made sense 'back in the day', and not just for memory bandwidth - it made for more compact code, back when memory was in very short supply (by today's standards). Now, of course, a number of technological changes - primarily multi-level caches - have changed the 'sweet spot' for optimal instruction complexity, while keeping the memory bandwidth needed for instruction fetches down. Noel

10 years, 10 months

And speaking of ALGOL

by mark.kahrs＠gmail.com

One could always implement a KDF9 emulator and then port Randall and Russell code (from the book). And r.e. ALGOL68, Peter Hibbard had some sort of ALGOL68 system working on the PDP11s at CMU I believe.

10 years, 10 months

Fwd: sparc20 available in boston

by paulkoning＠comcast.net

Posting this for another NetBSD developer. Please contact him directly if interested; I don?t have any additional information. paul > Begin forwarded message: > > From: David Holland <dholland-developers at netbsd.org> > Subject: sparc20 available in boston > Date: August 11, 2015 at 2:05:41 PM EDT > > I have a sparc20 sitting in my office that I need to get rid of for > space reasons. Anyone in Boston want it? I do not have time to deal > with shipping it, but you're welcome to try to persuade someone else > around here to do that :-) > > It has a keyboard and mouse, and I think a framebuffer, but no > monitor. There are I think two or three cpu modules, though I vaguely > recall there being an issue with one of them. Dunno how much RAM it > has. > > Deadline is Friday, although if someone speaks up by then I might be > able to hold it until the end of the month. Otherwise it gets thrown > out... > > -- > David A. Holland > dholland at netbsd.org

10 years, 10 months

Qbus split I&D?

by jnc＠mercury.lcs.mit.edu

> From: Johnny Billquist > The 11/34 that I played with did not have a product from Enable. ... > The product "my" 11/34 have came from Systime Thanks for chasing that down. Yes, that would explain the non-meshing memories! :-) > In addition, a few wires needs to be changed on the backplane, there is > a cable from a CPU card to the Systime card, and a few modifications > required on the 11/34 CPU itself. This all makes sense - if one can reach into the CPU, it's definitely plausible to have an upgrade which expands the size of the PARs (unlike the ENABLE board from Able). Noel

10 years, 10 months

And speaking of ALGOL

by jnc＠mercury.lcs.mit.edu

> From: Chuck Guzis > Why all this DEC stuff about Algol? I probably started it; I just mentioned the PDP-11 one because a lot of people already have either 11's, or an emulator up and running. Noel

10 years, 10 months

OT: Slow booting, was re: Booting an IBM MP 3000 S/390 System

by jnc＠mercury.lcs.mit.edu

> From: Chuck Guzis > Could it be that the presence of ECC registered SDRAM requires that > every memory location get written before boot-up can proceed? There's > 2GB of the stuff, so that could be the difference. I was going to suggest that, actually. Turning on ECC in the memory in a somewhat older HP minitower machine caused a long delay in booting while it cleared all the memory. Noel

10 years, 10 months

DEC RX02-PA?

by ben＠bensinclair.com

I found this on eBay, and I'm not sure what it is: http://www.ebay.com/itm/VINTAGE-DIGITAL-RX02-COMPUTER-SYSTEM-2-FLOPPY-DRIVE… I haven't seen RX-02s in a case like this before, and some Googling doesn't seem to reveal much of anything. Does anyone know what this is exactly? Thanks! -- Ben Sinclair ben at bensinclair.com

10 years, 10 months

SCSI Tape to TAP utility

by marc.verdiell＠gmail.com

Thanks Jay! Marc ---------------------------- From: Jay Jaeger <cube1 at charter.net> The link below is to a Google Drive folder with three files that I will leave up for a while: awstape.c - Read a SCSI tape, output in AWS format (Linux) awstoraw.c - Read an AWS file, output a raw byte stream awstosimh.c - Read an AWS file, output a SimH https://drive.google.com/folderview?id=0B2v4WRwISEQRfi1TWnlKU1hqUXphWVhpZ1FK OGFoVjRPVnppX1F2aUMwTUw0QkxSNEsyMjg&usp=sharing They are anything but elegant, but have gotten the job done for me. JRU --------------------------

10 years, 10 months

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