test-drb December 2010

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Happy DEC-10 everyone!

by dseagrav＠lunar-tokyo.net

And remember, if it's not 36 bits, you're not playing with a full DEC!

13 years, 5 months

Check your collections ...

by evan＠snarc.net

This weekend we had a holiday party for MARCH (Mid-Atlantic Retro Computing Hobbyists). At one point last night, several of us walked through our club's storage warehouse. Ian Primus discovered that we have a mostly complete Prime 6550 minicomputer. Apparently its racks have been sitting in our warehouse for five years, but they weren't arranged in the correct order, and I never realized they all go together to make one full system! So, check your collections .... one never knows what one might find among one's own collection after drinking a lot of beer and bourbon.

13 years, 5 months

another question about removing epoxy

by dgahling＠hotmail.com

I read the recent things about removing epoxy or other stuff gunked on components. I have two questions, I have an item with this stuff on it and I want to get it off, however, some of it is covering some of the chips, and I need to be able to identify the components. another worse problem is that one part of the circuit has a SIM card, which is also covered in white epoxy which I want to remove without damaging the SIM card. now the SIM card being encased in plastic means this is a whole lot of "fun" any suggestions?

13 years, 5 months

Decent Motorola 68000 - 68010 book

by lynchaj＠yahoo.com

Decent Motorola 68000 / 68010 book? Keith Monahan keithvz at verizon.net <mailto:cctalk%40classiccmp.org?Subject=Re%3A%20Decent%20Motorola%2068000%20 /%2068010%20book%3F&In-Reply-To=%3C4D059E20.3050300%40verizon.net%3E> Sun Dec 12 22:16:32 CST 2010 * Previous message: Decent Motorola 68000 / 68010 book? * Next message: mysterious 30 pin SIMMs * Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] ________________________________ On 12/12/2010 11:15 AM, Philip Pemberton wrote: > Hi guys, > > Does anyone have any recommendations for a good book on the 68000/68010 > CPUs (covering assembly language, the programming architecture and the > interrupt system as a minimum)? -----REPLY----- I like 68000 Microcomputer Systems: Designing and Troubleshooting By Alan D. Wilcox http://www.amazon.com/68000-Microcomputer-Systems-Designing-Troubleshooting/ dp/0138113998 I contacted the author and received permission to make a PCB based on the 68K CPU board in the book. We are making an S-100 68K CPU board PCB based on the board described in the book. It is currently in build and test and the status is on the Douglas Goodall wiki. http://douglasgoodall.pbworks.com There is more information on the N8VEM 68K CPU board on the N8VEM wiki. Thanks and have a nice day! Andrew Lynch

13 years, 5 months

RCS Open House

by wdonzelli＠gmail.com

Mark the 18th of this month - next Saturday - for an Open House at the Retrocomputing Society of Rhode Island* at our millspace in Providence, RI. Last month we fired up an EAI TR-10 analog computer, and I suspect we will be doing the same this month, as well as possibly some work on a PDP-11/45 and a DEC Lab-K. Lots of super nerd geek talk as well. And possibly a fun dog. Generally, hours are 3 to 8 PM, with a dinner break around 6. The mill is located in the neighborhood of Olneyville, just a few miles from central Providence. For directions go to: http://rcsri.org/directions.html Ask if you need more information! *Not the Rhode Island Computer Museum aka RICM! -- Will

13 years, 5 months

Decent Motorola 68000 / 68010 book?

by technobug＠comcast.net

On Sun, 12 Dec 2010 16:15:27 +0000, Philip Pemberton <classiccmp at philpem.me.uk> wrote: > Hi guys, > > Does anyone have any recommendations for a good book on the 68000/68010 > CPUs (covering assembly language, the programming architecture and the > interrupt system as a minimum)? > > [...] > -- > Phil. "Microprocessor Systems Design - 68000 Hardware, Software, and Interfacing" Alan Clements, PWS-Kent Publishing Company It appears that copies are available as PDF downloads from multiple sources... CRC

13 years, 5 months

Decent Motorola 68000 / 68010 book?

by classiccmp＠philpem.me.uk

Hi guys, Does anyone have any recommendations for a good book on the 68000/68010 CPUs (covering assembly language, the programming architecture and the interrupt system as a minimum)? I'm trying to disassemble the AT&T UNIX PC Boot PROM and Loader, and figure out why the Loader doesn't seem to think my WD2797 emulation is providing valid data... As I said before, it's probing the FDC, reading either two or four sectors, then giving up and trying the HDD instead.... -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

13 years, 5 months

AT&T 3B1 / 7300 / UNIX PC: Boot sequence from floppy

by classiccmp＠philpem.me.uk

Hi guys, I've got my 3B1 emulator "mostly working" in that it runs the Boot PROM, sees the floppy disc in the drive, and proceeds to boot from it, getting as far as the Loader. When it gets to the Loader, I get the following display: AT&T UNIX(tm) pc Loader version 3.51 Copyright (c) 1985, 1986 AT&T All Rights Reserved Searching floppy disk... #### Searching hard disk... ... and it stops there. I can tell from the emulator log that it's trying to get the hard drive controller to read CHS 0:0:0 and DMA the data into RAM at 0x77830, but because the HDC isn't implemented, it locks. What I expected was for the Loader to pick up the boot files on the Diags disk, boot from that, and ignore the HDD. Does anyone know what "typical boot behaviour" is for a 3B1, 7300 or UNIX PC, when booted from the Diagnostics floppy (Foundation Set, disk 1) ? This is a bit of a head-scratcher -- I'm trying to figure out if there's a problem with my FDC driver (wouldn't be the first one) or the DMA/interrupt controller, or if the Loader really needs a hard drive controller (or a really good fake) to boot the system. I'd also really like to know why the DMA controller has two separate direction control bits -- DMAR/W- and IDMAR/W-... this seems downright silly, though in keeping with the rest of the TechRef. My "annotated edition" corrects about a dozen minor and major errors in the register set descriptions, and adds a bunch of informational sticky-notes and scribbly comments to reinforce certain points. Ewwww... If anyone's interested in playing with my emulator -- go to <http://www.philpem.me.uk/code/3b1emu/>. Hit the link under "Mercurial repository", then ".tar.bz2" to get a Tarball of the sources. Untar it. Grab the boot PROMs, and put them in a directory called 'roms' as '14c.rom' and '15c.rom'. Use IMDU (Imagedisk utility) on a DOS PC (or inside Dosbox) to convert the Foundation Set disks from IMDs to binary files, then copy the first Foundation disk (Diagnostics) as 'discim'. Compile (you'll need libsdl, aka the Simple DirectMedia Layer) and run. I know the code is a mess, patches to rectify this (or any of the other millions of bugs) would be almost certainly be accepted :) There's also no keyboard or mouse emulation yet, just the CPU, video, RAM, ROM and a basic memory mapper and DMA emulation. As for Ethernet emulation... that's on the "maybe later" list, right after "learn how to send and receive Raw Ethernet frames on Linux". Thanks, -- Phil. classiccmp at philpem.me.uk http://www.philpem.me.uk/

13 years, 5 months

mysterious 30 pin SIMMs

by rumi_ml＠rtfm.hu

Hello Everyone! I would like to identify some mysterious old SIMMs: - module P/N appears to be "PS 91/344J" - 30 pin, single sided, 9 chips "SIEMENS HYB514100BJ-60" - "MADE IN U.S.A." probably manufactured in 1994 I have failed to find explicit information about these chips, but I'd guess they are 1Mx4 so 9 of them would make a nice 4MB module with ECC/parity. What kind of machine could these have been made for? Thanks, Sab

13 years, 5 months

S-100 and N8VEM pages

by lynchaj＠yahoo.com

Hi! Here are some links which may be useful to classic computer hobbyists. There is an announcements mailing list for S100computers.com and N8VEM S-100 boards http://groups.google.com/group/n8vem-s100 For those into social media, there exists "S-100 bus" page that you can "like" on facebook. http://www.facebook.com/pages/S-100-bus#!/pages/S-100-bus/132841730088337 There is also a newly created N8VEM page. http://www.facebook.com/pages/Homebrew-Computing-Project-N8VEM/1740728892846 08 Thanks and have a nice day! Andrew Lynch

13 years, 5 months

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test-drb December 2010