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101090 discussions

Homebrew projects wanted for exhibit at VCF 3.0

by CLASSICCMP＠timaxp.trailing-edge.com

On Sat, 3 Oct 1998, Jim Strickland wrote: > Ahh. I see. :) So if you took that same chip and built, say, an ethernet > board for an s100 bus or something equally wierd, that would qualify? In the process of doing so, of course, you'd end up building an S-100 to {ISA|PCI} converter :-). These "modern" interface chips tend to assume that they're going straight into a PC-clone. And I think an S-100 Ethernet interface is substantially less weird than an S-100 ARCnet board, and I've had several of those! -- Tim Shoppa Email: shoppa(a)trailing-edge.com Trailing Edge Technology Voice: 301-767-5917 7328 Bradley Blvd Fax: 301-767-5927 Bethesda, MD, USA 20817

27 years, 11 months

Universal drive

by maxeskin＠hotmail.com

Is there a device that would allow _any_ disk, independently of format, including Apple ][ disks, to be read? I know Teledisk can do this for all conventional formats, but not Apple disks. It would be nice to connect one of these and read the disk image into a file. The main reason why I ask is for rescuing messed up floppies... ______________________________________________________ Get Your Private, Free Email at http://www.hotmail.com

27 years, 11 months

Any *really* homebrewing going on?

by allisonp＠world.std.com

Doing something like a straight-8 is not trivial due to the shear number of parts and interconnects needed. A ttl version is manageable. The big thing is to experiment. I've considered doing a PDP-8E design and each time I take out a fresh sheet of paper it ends up being a 16bit or even 24bit machine. a 24bit machine with the same format as an 8 as some appeal. <the past 20 years. It is true that some of today's tools of the trade < for example, a good PAL/GAL programmer - are < more expensive than many of tools of 1975. But in real dollars, < today's $800 device programmer is much cheaper than, say, an 8080A < CPU, which had a street price of US$250 or so in 1975. There are Xilinx FPGAs (use an eprom for the pattern and it soft loads) saving the expensive programmer. Or the Lattice ISP parts also using minimally expensive interface cord (I think). Even if the parts cost some the lack of programmer lowers the cost. The expense is the software tools and the knowledge to write the VHDL/Xable code as needed to define the parts function. Check the TCJ web page for info about alta engienering for a cheap GAL programmer. There are parts like 8748/9 and 68705 that make programming pretty easy and the programmer can be homebrew. Their advantage is that assemblers can be had for free and the parts are cheap(or even salvaged). There are lots of options. Allison

27 years, 11 months

movie computers (The List! ) (fwd)

by jim＠calico.litterbox.com

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27 years, 11 months

Any *really* homebrewing going on?

by ddameron＠earthlink.net

HI Gary and all, At 10:27 AM 10/3/98 -0700, you wrote: >To start things, I'd like to offer that I'm in the process of recreating >a copy of Edmund Berkeley's "Simon" computer designed and built by him >in the 50's as a demonstration "show and tell" of how a "real" computer >works. It's a collection of 100+ relays, two paper tape readers and >some blinkey lights. Version 1 was a "two bit" computer with the >ability to scale to 4 bits, while version 2 scaling to multiple precision >using a real CARRY! It's a small machine - "almost" a "laptop". Right >now I'm collecting parts - specifically looking for the two paper tape >readers (solenoid operated - not motor driven - so if anyone out there >has one or two of these...) > >For a reference to Simon, see the thirteen part series in Radio Electronics >magazine (US publication) from October 1950 through October 1951. >"Constructing Electronic Brains" by Edmund C. Berkeley and Robert A. Jensen. >There was also a cover article in Scientific American around that time - >sorry I don't have the issue handy with an overview of the project. > This sounds interesting. I will try to find the Radio Electronics articles you mentioned. Can you describe the paper tape, was it 5 bits? Maybe something else could be used to simulate it, maybe a mechanical drum or a diode matrix = rom if the number of bits isn't too large. My first "computer" project was the game of "life" using TTL logic, for example a 7490 decade counter to count the cell's neighbors as other counters moved through the 8 neighbor's x, y addresses. -Dave

27 years, 11 months

Back e-mail files

by rcini＠email.msn.com

Could someone please cc: me on the list files #539 to #546. I had another run-in with installing Windows NT5 Beta, so I lost most of my C: drive, including my e-mail files. Thanks in advance! Rich Cini/WUGNET - ClubWin!/CW7 - MCP Windows 95/Windows Networking - Collector of "classic" computers <========= reply separator ==========>

27 years, 11 months

Any *really* homebrewing going on?

by jimw＠agora.rdrop.com

At 08:00 PM 10/3/98 -0500, Doug wrote: >On Sat, 3 Oct 1998, Sam Ismail wrote: > >> We start a little movement, people fall in behind it, it grows, and BAM!, >> homebrew is chic again! > >I doubt it. The homebrew/hobbyist movement had a very compelling driving >force: just about the only way to get your own computer was to built it >yourself. That's no longer true. But there is a pretty strong homebrew >aircraft movement, and it also still makes sense for robotics. Do remember however, to a large extent a 'robot' is just a computer on wheels with some very unusual peripherals... B^} -jim --- jimw(a)agora.rdrop.com The Computer Garage - http://www.rdrop.com/~jimw Computer Garage Fax - (503) 646-0174

27 years, 11 months

HOMEBREW mailing list

by sethm＠loomcom.com

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27 years, 11 months

Voltage needed

by roblwill＠usaor.net

I have a few questions: 1) Does anyone have the voltage for the backlight on a Toshiba TLX-1342-G3B1 CGA LCD? It was pulled from a Tandy 1400HD laptop. 2) Is there any way to connect a non-Apple monitor to the RGB port on an Apple //c? It's a 15-pin connector, like a PC joystick/MIDI connector. Being a 15-pin connector, would a VGA monitor work with it? Or would it just need to be a CGA, or would I just have to get an Apple monitor? 3) I know it's pretty rare, but does anyone have an LCD panel for the //c? ThAnX, -- -Jason (roblwill(a)usaor.net) ICQ#-1730318

27 years, 11 months

Computer for Sale

by Rand-E＠worldnet.att.net

Can you help me find someone interested in the original Amiga computer. I think it's the Amiga 2000 with 256K RAM. I'm open to all offers.

27 years, 11 months

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