I've been reading the story about the business of Justice subpoenaing the
search records from Google for a week last summer. Google doesn't want to
turn them over, but should they lose their appeal, why not turn the data
over in the form of punched cards?
This qualifies as "electronically readable media", doesn't it? It'd
probably be several truckloads and leave those guys at DOJ wondering what
to do next...
Cheers,
Chuck
Dudez & Dudettez:
I'm trying to get some SnapForth ROMs running for the Panasonic HHC 'puter
- and I'm having a bit'o'difficulty, mainly as I know... ummm... "squat"
about Forth. ;^>
I've gotten the ROMs to be able to start SnapForth, ask for a filename,
create the filename & filespace (about 1K of RAM goes "buh-bye" for every
filename I make... ;-) but no matter what I type, all I get is "Can't Find
xxxxx" where xxxxx seems to be any durned thing I type.
It can't seem to make new words, and every simple "Hello World" type
proggie I've found on the net makes *no* sense to the 'puter.
It looks like it has a max. of 4-character words... duh, waitaminit...
lemme check the ROMs again... *maybe* 5-character words, as it looks like
the last character of the word is OR'ed with $80... It looks like it's got
quite a few words, looking at the ROMs in ASCII - I found VARIA, CONST,
STRIN, CVECT, JUMP....
I could provide a clip of the ROM word table if it would help...
I've tried:
100 LLL !
[[ To try to store the variable 100 in LLL ]]
100 VAR DORK
100 VARI DORK
100 VARIA DORK
100 VARIABLE DORK
[[ To try to store the variable 100 in DORK ]]
100 CONS BURP
100 CONST BURP
[[ To try to make BURP a constant of 100 ]]
I've also tried:
.S
DROP
." Hello World"
and other things I'd seen in various webpages thanks to Google.
Anyone got any other idears for me?
Thanks,
Roger "Merch" Merchberger
--
Roger "Merch" Merchberger | A new truth in advertising slogan
SysAdmin, Iceberg Computers | for MicroSoft: "We're not the oxy...
zmerch at 30below.com | ...in oxymoron!"
My AOL (which I will be dumping later this year) has lost a lot of my
incoming mail, and not sent all of my outgoing mail. I apologize for this
inconvenience, and if you have not heard from me regarding older DEC parts, please try
to contact me.
Thanks, Paul
217-586-5361 10am-8pm
For some time, what I consider the best SGI Tech Resource site on the web had
no mirror. Over the years I have referenced the site for SGI tech info,
benchmark info, drivers, etc. It contains literally hundreds of MB of data.
So Ian Mapleson (the site's owner) and I have worked together to create a U.S.
mirror at: http://vintagecomputers.info/
Sponsored and paid for entirely by my little company ;-)
Enjoy!!!
Cheers,
Lyle
--
Lyle Bickley
Bickley Consulting West Inc.
Mountain View, CA
http://bickleywest.com
"Black holes are where God is dividing by zero"
> Tony Duell wrote:
>
> And the board basically worked. The display at boot-up was sane.
> Suspecting a RAM problem, I put in a complete new set of
> 4164s -- no change.
Hmmm, sounds like swapping to me ... ;-)
- Henk.
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Hi, this probably is beating a dead horse, but I finally
acquired a datasheet for the 6RS20SP4B4, used in the LT33
teletype modifications. I have scanned it and made it
available at
http://so-much-stuff.com/pdp8/pdf/6rs20sp.pdf
(The data sheet actually describes the 6RS20SP and 6RS5SP
families.)
Contrary to DEC documentation, it is a thyrector (not a
thyractor, which would have an inductor in it).
Vince
Awhile back I posted a WTB for some NSC 800 CPU chips and didn't turn up
anyone having any for sale. Calls to the usual surplus places came up
empty.
I did finally manage to snag a bunch of these--more than I need.
These are the 3 MHz ceramic 40 pin DIP packages with a date code in late
1986. Supposedly NOS (they certainly don't appear to be pulls).
In case you're not familiar with these, they're basically CMOS Z80 CPUs
with 8085 timings. They have the same half-interrupt pins that the 8085
does, but NMI traps to 0066H and there's no RIM or SIM. Interface signals
are prety much 8085-compatible with the 8085-style multipexed data/address
lines. These are NOT pin-compatible with either the 8085 or the Z80, but
my need for them is to replace an 8085 with the assistance of a little glue
(mostly flipping a few signals). You can find the data sheet on the web at
http://www.alldatasheet.com/datasheet-pdf/pdf/NSC/NSC800.html.
At any rate, I've got about 15 of these to spare and will part with them
for $2 each+postage I'll give preference to those buying more than one.
Cheers,
Chuck
This story might amuse some of you...
I have an Epson PX4 laptop in bits on the bench, and for various
reasons I needed to work out which RAM stored each data bit (there are 8
64K*1 DRAMs on the board, these are actually somewhat odd DRAMs with
internal refresh, but anyway...) The problem is that while the main
processor is a Z80 (and thus the data bit order is known at the processor
pins), the bus goes into a gate array (GAPNDL), comes out on another 8
pins and goes to the RAM.
To make life difficult, my PX4 doesn't have any programming language (I
don't have the BASIC ROM for it, yes, I know I could download an image,
but I don't have any spare carriers for the EPROMs). It doesn't have DDT,
or ASM, or even ED. It does have the standard Utilities, PIP, STAT,
FILINK, etc
So, this is how I hacked it.
Firstly, I fitted the PX4's PCB into the case, without the upper shield
plate. Fitted the battery contacts, fitted the lower case and a few of
the screws. Put the display PCB (uncased) in roughly the right position,
fed the flexiprint through the case and plugged it in. Now, with the
keyboard removed, I could get access to the solder side of the main PCB.
And since the keyboard is just switches, it should be safe to fit and
remove it with the thing powered up.
Then I got out my PX8. At least this one has BASIC (althogh nothing
else other than the utilities I mentioned above, no DDT, or ASM). And I ran
this little BASIC program on it :
10 FOR B=0 TO 7
20 OPEN "O",#1,"A:BIT"+CHR$(48+B)+".COM"
30 PRINT #1,CHR$(243);
40 PRINT #1,CHR$(62);CHR$(2^B);
50 PRINT #1,CHR$(50);CHR$(255);CHR$(1);
60 PRINT #1,CHR$(195);CHR$(0);CHR$(1);
70 CLOSE #1
80 NEXT B
90 END
This created 8 .COM files in the RAMdisk of the PX8. Each one was of the
form :
DI ; Don't want anything else messing around at the same time
LD A,#01h ; Set bit 0
LD (01FFh), A ; Do a write to the RAM of that data word
JP 0100h ; round again, remember CP/M .COM files load at 100h
The other 7 programs write 02, 04, 08, 10, 20, 40, 80 hex respectively to
RAM.
Hand-assembled that using the Z80 data sheet and an HP16C, wrote the
BASIC program above
Put the PX4 keyboard in place, linked the 2 machines via the RS232 ports,
and used FILINK to transfer the 8 files over to the PX4. Ran the first
one, of course the machine locked up (it was supposed to). Removed the
keyboard, connected Channel 1 of the LogicDart to pin 3 of one of the
DRAM chips (Write enable/), probed with Channel 2 on pin 2 (Data In --
actually linked to Data Out on the same RAM, I checked this first!) of
each of the DRAMs in turn until I found the one that had a high data line
when the write pin went low. That was the RAM that stored bit 0.
Reset the PX4 and was pleased to see that the RAMdisk was unchanged so I
didn't have to download the programs from the PX8 again. Ran the next
program, found the RAM chip that stored bit 1, and so on.
-tony
