>
>Subject: Re: Junkbox CP/M system?
> From: Jules Richardson <julesrichardsonuk at yahoo.co.uk>
> Date: Mon, 23 Apr 2007 18:47:34 -0500
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>Chuck Guzis wrote:
>> Just buffer some data and address lines off for a floppy or IDE
> > interface
>
> From a programming point of view, how easy is accessing IDE compared to a
>typical FDC ('765 or similar)? I did write some assembler to access an IDE
>drive about 12 years ago, but have long since forgotten details! :-)
IDE (or CF) is easier than floppy. First, it's buffered so you do not
have the tight timing problem of FDC data transfer rates. Second, the
the interface is around the same as for an PPI or serial port more or less.
Allison
I could swear there was a discussion recently (like in the last week)
about 11/34 consoles and KY11 documentation. Or maybe I dreamed that
up.
Anyway, it prompted me to try and figure out why my 11/34 console was
blank. The serial monitor works fine, as does the cpu, but the "digits"
in front are blank and only the run and dc-ok lights are on.
(this is a symptom described in the ky11 documenation - thank you very much
to whomever scanned that in)
Has anyone debugged a dead KY11 ? Any hints?
I looked at the docs and schematics and followed the wise words on page 8-2
titles "M7859 FAILURES"
I have +5 and -9 on the 8008 as well as clock(s). But the "INTR" line
(pin 18) is stuck high. I assume this is the problem.
[aside - I plugged one of the cables (J3) in backward and got the display to
show all zeros', but the scan rate was *very* slow, light 10hz; I found
that interesting]
STOP L and TS1 L are inactive, as are all the S0,S1 & S2 on the 8008.
Interestingly ping 14 is wiggling. I don't have a databook with with
an 8008 in it and that pin is not labeled.
I have only just started, but I'd thought I'd ask if anyone has done
this recently. It's fun debugging ttl. It's all so *slow* and manageable ;-)
-brad
Hi,
> A European PC with a CGA card will output 60Hz NTSC video....
Whilst this is perfectly true, IIRC the IBM CGA monitor takes the "RGBI"
signal produced by the card, not the composite one.
I believe that the composite output was intended primarily for driving a
modulator to allow the use of an ordinary TV with the system.
Almost none of the "clone" CGA cards I've come across over the years support
the composite video output.
TTFN - Pete.
A couple of relevant sites:
http://www.csd.uoc.gr/~hy325/spring-2006/docs/8042.pdfhttp://www.beyondlogic.org/keyboard/keybrd.htm
mike
********************************
Date: Mon, 23 Apr 2007 15:19:55 -0700
From: "Chuck Guzis" <cclist at sydex.com>
Subject: Re: Junkbox parts...
On 23 Apr 2007 at 11:29, Allison wrote:
> Can these parts (PC AT keyboard interface) can they be used for
> small system as a interface from AT or PS2 keyboard to a 8bit micro.
> Right off I suspect yes. However is there any information on how
> to "talk" software wise to them as to what kind of results and
> commands they take?
It's all described in pretty decent detail in the PC AT Techref.
Look in the "System Board" section. When I first saw it, I wondered
why the IBM writers had wasted so much paper on it.
Cheers,
Chuck
Hi,
>(....I'm partial to just about any MC68k series systems that didn't
>come from Cupertino).
Personally, I'm partial to just about any machine which isn't hamstrung by
being based around the lousy, prehistoric x86 architecture.... ;-)
TTFN - Pete.
Does anyone have the pinouts (schematics) for cable to connect HP 9000 E25
with MUX (MDP)? E25 has a strange four-row socket (called DB78, afaik),
and MDP has normal DB9. I'd like to get this machine to work, and it's the
only way to get a console. Thank you :-)
--
If you cut off my head, what would I say? Me and my head, or me and my body?
Sellam;
If you find him, let me know, as he screwed me out of $670, and quite a few others as well. I've tracked down his father in law, who claims to not be responsible for all the people he has screwed.
Mark
Time to trim the excess. Wish I had time & space for it. It's in the
New Haven CT. area. I'd prefer not to ship, but I will... Make me an
offer. IIRC, floppy, external SCSI riser, 64MB (I think) RAM, no HDD,
slide-cover over the floppy disk. Also, I do believe I have a spare chip
for the one that tends to fry. Dead tree documentation in binders
included...
--
--- Dave Woyciesjes
--- ICQ# 905818
--- AIM - woyciesjes
"...Talking to you is like clapping with one hand."
Anthrax, "Caught in a mosh"
