> Date: Fri, 25 Jan 2008 16:40:09 -0600
> From: Jim Leonard <trixter at oldskool.org>
> Yes. In fact, myself and a few others have done significant work trying
> to get CGA properly emulated (composite CGA emulation is pretty damn close
> to the original; some tweaked modes work as well). It can even boot
> bootable diskette images (as long as copy protection is absent).
...and that's just the problem here. The program diskette is copy-
protected. What what, I'm not sure.
Cheers,
Chuck
> Date: Tue, 22 Jan 2008 19:33:15 -0800
> From: dwight elvey <dkelvey at hotmail.com>
> Here goes with using your idea to double use the a register. Except
> If I start it with 2, I can use the carry instead of the sign bit. What
> fun!
>
> Div10:
> ld a,#2
> ld de,#-640d
> divloop:
> add hl,de
> jr c, div1
> sbc hl,de
> div1:
> rl a
> jr nc,divloop
> add hl,hl
> ret
Ah, but you forgot the add hl,hl to shift the dividend after each
iteration. Put it at the top of the loop so it doesn't interfere
with the operation of the "rl a/jr nc" pair and scale your divisor by
an additional power of 2 and you should have it.
By now, we've probably bored the hardware guys to tears and DEC
people are tearing out their hair, so we should probably drop the
subject.
My apologies, but I've always found bit-twiddling fun. It seems that
every platform has some peculiar characteristic that can be exploited
to good advantage.
Cheers,
Chuck
I purchased two from the guy. They are NOS and the ribbon hasn't
dried out. He apparently has a bunch of them. He's selling them for
$15 each, but he will combine shipping if you buy more than one. I
tried to arrange a discount for buying 5, but he was firm in his
pricing. So I bought 2. I figure that if I use them both up, I can
try my hand at re-inking the ribbon. At $75 for 5 ribbons, that was
more than I paid for the terminal itself :-).
--
"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/>
I need a programmable device, with the standard 24 pin layout, with 100nS acces time.
2716's are 350ns to 450ns, 2816's are 150nS match.
What other options do I have ?
( Target : replace some bipolar microcode proms So I can experiment a bit)
Jos
Hello all,
I have an IBM PC, 5150, 16-64KB motherboard, that appears to be dead. Power
on produces no display or disk activity (even after a while), and no beeps
>from the speaker (I tried a couple of speakers, so I don't think it is a
speaker issue.
>From what docs I found on the internet, the switches are set up properly for
the machine's configuration...
I am pretty sure the motherboard is getting power. I checked at a RAM
socket, and all voltages were there, and well within specifications.
The problem is, I'm not sure where to go from here. I have NO schematics,
and haven't ever troubleshot a 5150 before.
I DO have a good meter, and a scope (and I know how to use it!)
What would be the first things to check?
Thanks for any help!!!
Rich B.
>
>Subject: 2716 with 100 nS access time ?
> From: Jos Dreesen / Marian Capel <jos.mar at bluewin.ch>
> Date: Fri, 25 Jan 2008 21:11:26 +0100
> To: General Discussion: On-Topic and Off-Topic Posts <cctalk at classiccmp.org>
>
>I need a programmable device, with the standard 24 pin layout, with 100nS acces time.
>2716's are 350ns to 450ns, 2816's are 150nS match.
>What other options do I have ?
>
>( Target : replace some bipolar microcode proms So I can experiment a bit)
>
> Jos
The only way you can get to under 100ns is using larger EEproms or Eproms
as their smaller feature size made them faster. You can get 27256s under
100ns (might be cmos but no matter) and larger parts go down to under 50ns.
Ofcourse that means a chip adaptor but thats no big deal.
Allison
At 01:16 PM 1/25/2008, from at fu3.org wrote:
>2008/1/25, Chuck Guzis <cclist at sydex.com>:
>> trying to get an old PC program (on 3.5" media) going on his
>> modern PC system. He's run into one of the copy-protection schemes
>> that worked fine under MS-DOS but not under 2K or XP.
>
>DOSBox sends its regards.
Yes, it's great for reviving old programs under contemporary Windows.
http://en.wikipedia.org/wiki/DOSBox , at http://www.dosbox.com/.
- John
I'm working on getting my Ohio Scientific Challenger II running.
The system is a 505 CPU (first rev that doesn't match schematics online),
535 memory 48k (no schematics online I have found), 540B video card
with color and dual 8" floppy. This machine was modified with a switch so
I can use either the video board or a serial terminal.
Its pretty close to the system I first used in high school.
I think I have the computer working but would like to run a memory test.
Does anyone know of one available that I could load in through the
monitor? Or do I need to see how much 6502 I can remember from 25 years
ago?
The video card generates the first line right after end of vertical
blank so all my monitors cut off most of the first line. Is this normal?
Next is moving on to the the 8" floppies. After I get them working I want
to dump all the disks I have.
I found at osiweb a program to dump floppies but it was for 5 1/4".
Does anybody know of one that will dump the 8"? Perferably in a format
that an emulator can use so I can verify the dumped disks are good.
http://www.reghardware.co.uk/2008/01/25/ibm_5155_up_for_sale/
Quote:
[
Forgotten Tech
Want to own a piece of portable computing history? Actually, we use
the word 'portable' advisedly - we're talking an IBM 5155 here, a 30lb
(13.6kg) monster that, as the eBayer offering it up to the highest
bidder admits, "is not a MacBook Air".
]
Amusing, even affectionate, story and indeed auction description, too.
--
Liam Proven ? Profile: http://www.linkedin.com/in/liamproven
Email: lproven at cix.co.uk ? GMail/GoogleTalk/Orkut: lproven at gmail.com
Tel: +44 20-8685-0498 ? Cell: +44 7939-087884 ? Fax: + 44 870-9151419
AOL/AIM/iChat: liamproven at aol.com ? MSN/Messenger: lproven at hotmail.com
Yahoo: liamproven at yahoo.co.uk ? Skype: liamproven ? ICQ: 73187508
