I couldn't help it. I had to scan a 1702A 256byte EPROM.
This one was done at 6400dpi, really 3200dpi along the scanner array
and 6400dpi in the scanning direction. So there is some
interpolation in the image. Still a pretty impressive picture for a
scanner. :)
http://www.stockly.com/images3/071208-1702A-1.jpg
Just playing the new scanner...
Grant
At 18:28 -0600 11/28/07, Sean wrote:
> A Color Computer or Color Computer 2 seems to fit the bill. The CPU is
>the nicest of the 8bits (IMHO) and the video screen is more logical than
>anything you'll find on the C64, Atari or Apple. ...
At 18:28 -0600 11/28/07, Mark M. wrote:
>I'd tend to agree. The 6809 is a lovely processor, and there aren't any of
>the "black box" chips that others have mentioned. ...
I'd agree completely, *except* that if you want to do
Assembly (conveniently), you also need the EDTASM+ ROM cartridge, and
prices/availability for those seem to have gone a little wonky in the
past 6 months. EBay prices yield systems for $5 to $10 (plus
shipping), but the EDTASM cart is over $30. I have not found a
non-eBay source that actually had a cart for sale at all.
I don't quite have the knowledge to do it, but something I'd
really like to see is a reverse-engineered equivalent (editor,
assembler, monitor) implemented and available as an inexpensive
cassette tape or downloadable sound file that could be played into
the cassette port (or even, shudder, READ-DATA/POKE basic program to
type in) and an accompanying public-domain manual. I know this would
be vulnerable to getting overwritten by an out-of-control assembly
program, and the ROM version is preferable, but it sure would turn a
cheap, otherwise very capable BASIC platform into a cheap, very
capable Assembly language platform that one occasionally had to
re-load.
I note that there are good emulators and cross-compilers
available for both Mac OS-X and Windows:
Toolshed for OS-X rocks:
http://sourceforge.net/projects/toolshed/
David Keil's Windows emulator gets excellent reviews:
http://www.discover-net.net/~dmkeil/index.htm
no relation either way.
--
- Mark, 210-379-4635
-----------------------------------------------------------------------
Large Asteroids headed toward planets
inhabited by beings that don't have
technology adequate to stop them:
Think of it as Evolution in Fast-Forward.
------------Original Message:
Date: Sat, 8 Dec 2007 18:30:43 +0000
From: Ethan Dicks <ethan.dicks at usap.gov>
Subject: Re: GAL16V8 as a modern substitute for a 7447?
On Sat, Dec 08, 2007 at 08:12:30AM -0800, Peter C. Wallace wrote:
> On Sat, 8 Dec 2007, Ethan Dicks wrote:
> >Has anyone here worked with or ever plotted silently to create a moderish
> >7-segment decoder/driver from a GAL16V8?
>
> IICRC the 16V8 does not have buried registers so you will lose the 4 of the
> output pins (for the counter) that you needed for the 7 segment outputs
Right.
> If you are using sockets, a 5V or 3.3V (cheaper) 44 pin PLCC CPLD might be
> a better solution, plus they are easier to program. A X9572XL will probably
> do 4 decades of count/decode for about $2.00
That is not feasible. I need 7 or 9 decades of count/decode, and I happen
to have an abundance of GALs and a GAL programmer. If it comes down to a
CPLD-design, I'll probably throw in the towel and use an AVR microcontroller
and perhaps a real 74LS47 or 74LS247 to lower the I/O requirements a touch.
I was just musing about what it might take to put it all in hardware
rather than a combination of hardware and firmware. Using an MCU makes
the entire problem trivial.
Thanks,
-ethan
-----------------
--------------Reply:
Well, since it started one of "those" discussions here as usual anyway,
what's wrong with a 74143?
mike
I have an FAA control room keyboard that I picked up off ebay. Each
key has a little bulb underneath it that lights up the keys for use in
the dark. I need to get some replacement bulbs since some of them
have burned out. I haven't disassembled this thing enough to know if
they have parts numbers on them or not.
Does any of this sound familiar to anyone? I'm thinking that the
bulbs burning out has got to be a regular occurrence and that the
bulbs are therefore probably socketed and not soldered, but again I
didn't disassemble it that far to know. The keyboard assembly inside
is labelled MicroSwitch IIRC.
--
"The Direct3D Graphics Pipeline" -- DirectX 9 draft available for download
<http://www.xmission.com/~legalize/book/download/index.html>
Legalize Adulthood! <http://blogs.xmission.com/legalize/>
Hi
I have a machine with a 77711501 floppy drive and it's bad.. I have
tried 3 different 360k drives. I tried to find specs on it but so far have not.
What is the difference between that drive and a 77711800 used in a PC
The computer just says there is a drive error. I'm using the same jumper
settings on both. I have also tried a Teac fd-55bv.
Is it a 320k drive ??
- jerry
Since our printer has malfunctioning and not working and I am interested in getting a printer for
my computer and the M8000 is what we need. If your Stylewriter printer is working, we would
be happy to pay the shipping to have it shipped here. My email is:
glade at barneygang.com
> In the case of the HP41 calculator, it was physcially impossible to run
> machine code from the machine's internal RAM. The processor was a pseudo
> harvard architecture, RAM was organised in 56 bit 'registers' connected
> to the SPU DATA line, ROM was in 10 bit words connected to the ISA line.
> Some hackers found a way round this, making ROM emulator boxes (normally
> called MLDL (Machine Language Development Lab) units).
Where does the synthetic programming fit in? I thought it was
a case of creating machine language code in RAM. And I remember
it being based on some ugly tricks, rather than an external device.
BLS
Hi list,
I have 7 2000-sheet boxes of tractor-feed plain 11x14.5" listing paper
which I'd like to give away as I need the space back. Located in West
Yorkshire, UK.
Sorry, it isn't greenbar ;)
There are also 3 boxes of A4-ish size (11x9.5" I think they are).
Free, but you'll have to collect. I'd ship if you're desperate, but it
won't be cheap as they're heavy.
Please drop me a mail if you're interested - thanks.
Ed.
>> One thought was to attempt to combine a 7490 _and_ a 7447 in a single
>> GAL16V8. I have blown hundreds of PALs, but have much less experience
> IICRC the 16V8 does not have buried registers so you will lose the 4
> of the output pins (for the counter) that you needed for the 7 segment
> outputs
You can do it but you need to make a counter that counts in segment
patterns and not binary. I did see an example of this and remember
thinking how clever it was but a search of my files and online has
failed to turn up a copy.
Lee.
>>> Camp Evans was just a small part of the Signal Corps. It was not the center, by any means.
I never said otherwise. BUT, in all of the examples I've cited, the sources indicated not just the Signal Corps lab, but specifically the Signal Corps comms lab at Fort Monmouth. That's us (there is plenty of other evidence too, but we're already OT for cctalk ... feel free to carry this over to the local club list.)
