I am evaluating building a replacement display for the AIM-65 that does
not use the DL1416. I have several modern options - a 20x1 LCD is
cheap enough, as are more modern 4-char ASCII LED displays. The interface
is somewhat trivial - the connector on the AIM-65 mainboard has enough
signals to talk to a 6520 PIA (since that's what is on the normal display
board to begin with). There are couple of angles to pursue...
I have successfully tested a Motorola 6821 in place of the Rockwell 6520
in a real AIM-65. Since I have a few 6520s and many 6821s, that's a win.
Either way, it's trivial to hang a display off of the 6502 bus without
a PIA in the way. I'm curious if anyone knows why they bothered to
put a 6520 on the display card? Did they want to keep the bus loading
to a small, known quantity? If so, then I'll consider that any ASCII
LED solution I come up with needs to have appropriate signal conditioning.
I can't see how a modern LCD display would load the bus any worse than
a 6520, so it might be worth the direct approach.
So... the hardware is no big deal. The software, though, could be lots
more work. I have real ROMs and ROM images. Are there any sources to
the AIM-65 ROMs that are in a state to be compiled back into working,
matching binaries? If I'm going to change the nature of the display,
the code will have to follow. If the code is changing, then there's
no reason I can't experiment with a multi-line display - I have a 20x4
VCD and a 20X4 LCD display already in hand. I think I can locate a
40x2 in my junk box, but at first, I'll probably ignore the right half
and if I used it, treat it like a 20x2.
Is there anyone out there who has done any real AIM-65 hacking? I can
start from zero if I have to, but if there's any preexisting work out
there, I'd like to see about starting ahead of zero.
-ethan
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In a message dated 4/17/02 9:13:12 AM Pacific Daylight Time, foo(a)siconic.com
writes:
> These things are extremely rare in general, at least out in the wild.
> This is only the third to surface, and of all three now documented on the
> web (or at least known to be) they are all completely different.
>
At one time I had a Heath Zenith Z150 PC mounted inside a Metal Faraday cage.
Has anyone seen anything like this? I assumed it was for Tempest type
protection but then it did come out of the Hanford Nuclear Reservation. (no
it didn't glow).
Paxton
Astoria, OR
> In the spirit of this "pecker contest" (as a former
> boss of mine would call it), let me suggest the
> "ultimate" metric for bragging rights...
> cubic-foot-BTU/Hr-lb-amps per KByte-MIPS.
Should that read cubicfoot * BTU/Hr * pounds *
(amps/KByte) * MIPS ?
Should be WATTs rather than AMPs, since the
power consumption is the key issue, not the
current.
In the interest of international relations, should
we switch to KG instead of pounds?
And cubic meters instead of feet?
How about KbyteMIPS / Wm^3 smallest number wins?
Steam driven difference engine anyone?
Lee.
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Andreas,
>> running only one in "voltage source" mode, the
>> other(s) in "current source" mode effectively.
> This is how any group of paralell power supplies works.
And this requires the over-current protection to not shut
down the individual supply, but instead have it contribute
as much as can safely be done. On the other hand...
No. All the supplies are set up as constant voltage. They are
paralelled through either load share resistors or blocking
diodes. Each can be overcurrent lockout protected as the
forward drop of each diode or resistor ensures load sharing.
No single supply will be at it's current limit. This is not a
theory, this is how regulated paralelled power supplies work.
This will be inhibited by the above-mentioned load-sharing
feature, so you need some kind of "communication"
between the supplies in order to be able either to share
load or to completely shut down all others instead of
running them in current-limiting mode after some have
failed.
None of the supplies are ever run in current limit mode, they
are all, always, running as voltage sources. In th eevent of
faliure once the remaining supplies can no longer cope
with the load they all shut down in short measure. No
communication is needed.
> Use enough supplies so that one faliure is
> tollerable.
The only thing that needs preparation for this may
be mechanics: you wouldn't want to try unscrewing
thick power wires and risking them to touch any
other metal parts inside a running system...
You use off the shelf supplies and they each plug (via the
load share network) into the output busbar. No bolts, no
screws, just (un)plug and go.
So, I think the bottom line is: running PSUs in
parallel is something that really can be done,
but there are several bells and whistles you
need to take into account.
It's really quite easy, AT type 'dumb' switchers just need
a blocking diode, make sure though that you turn them
all on together.
.. We get to a point where a microcontroller makes
sense to control this, and I have seen this in real
systems.
As have I. There is nothing more anoying than the faliure
of a system because someone decided a microprocessor
was needed where Kirchoff's laws would have been sufficient.
Lee.
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> I hesitate to mention this even if it is well over 10 years old.
>
> I have a copy of Heath Zenith Windows that I posted on eBay.
>
> http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2017754574
>
> I have been corresponding with collectors as how to verify this is actually
> MS Windows 1.0. There are no version numbers at all on the disks, box, manual
> and envelopes.
>
> The Heath Zenith Model Number of the Software package is MS-5063-30. Can
> anyone verify what this model number represents?
Zenith changed their software packaging a few times over the years.
This is the same packaging as what I have on OS/2 1.0, and MS-DOS
3.3+.
Consequently, looking back at the calendar, I think that
it's far more likely that this is Windows 2.0 or 2.1.
Sorry...
-dq
I hesitate to mention this even if it is well over 10 years old.
I have a copy of Heath Zenith Windows that I posted on eBay.
http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=2017754574
I have been corresponding with collectors as how to verify this is actually
MS Windows 1.0. There are no version numbers at all on the disks, box, manual
and envelopes.
The Heath Zenith Model Number of the Software package is MS-5063-30. Can
anyone verify what this model number represents?
Since it comes on 5 5 1/4" 48tpi floppy disks and can be installed in a HZ
8088 PC I feel certain it is original. The manual indicates it can be
installed on a two floppy machine besides on a hard drive.
Any information would be helpful.
Please, no flames...
Paxton
Astoria, OR
> From: Douglas H. Quebbeman <dquebbeman(a)acm.org>
> >
> >My computer dims the neighborhood's lights when I turn it on...
> >
> >My computer has fewer transistors than yours...
> >
> >My computer has no transistors, just tubes...
> >
> >My computer's valves burn out faster than yours...
> >
> >My computer's got more gears than yours...
>
>
> Then there is...
>
> My computers daddy is bigger than yours.
Hmmm... Gordon Bell is *not* a small man, but "big daddy"?
;)
-Douglas Hurst Quebbeman (DougQ at ixnayamspayIgLou.com) [Call me "Doug"]
Surgically excise the pig-latin from my e-mail address in order to reply
"The large print giveth, and the small print taketh away." -Tom Waits
From: Ethan Dicks <erd_6502(a)yahoo.com>
> cubic-foot-BTU/Hr-lb-amps per KByte-MIPS.
There is a redundant term.
>Any other estimates? Should we consider BTU/Hr _or_ Amps (since more
>power means more heat) or leave both values in the metric?
Naw, thats not right either. It should be Amps*line_volts (or Vars).
Then again the vertical stacking distance is another metric. After all
Who knows how high that sh!t can pile!
Allison
> > > > My computer's heavier than yours.
> > > new sig: My computer's got more blinking lights than yours.
> > My computer's slower than yours.
> My computer is uglier than yours...
My computer draws more power than yours...
Megan Gentry
Former RT-11 Developer
+--------------------------------+-------------------------------------+
| Megan Gentry, EMT/B, PP-ASEL | Internet (work): gentry!zk3.dec.com |
| Unix Support Engineering Group | (home): mbg!world.std.com |
| Compaq Computer Corporation | addresses need '@' in place of '!' |
| 110 Spitbrook Rd. ZK03-2/T43 | URL: http://world.std.com/~mbg/ |
| Nashua, NH 03062 | "pdp-11 programmer - some assembler |
| (603) 884 1055 | required." - mbg KB1FCA |
+--------------------------------+-------------------------------------+
>From: Innfogra(a)aol.com
>
>In a message dated 4/17/02 9:13:12 AM Pacific Daylight Time, foo(a)siconic.com
>writes:
>
>
>> These things are extremely rare in general, at least out in the wild.
>> This is only the third to surface, and of all three now documented on the
>> web (or at least known to be) they are all completely different.
>>
>
>At one time I had a Heath Zenith Z150 PC mounted inside a Metal Faraday cage.
>Has anyone seen anything like this? I assumed it was for Tempest type
>protection but then it did come out of the Hanford Nuclear Reservation. (no
>it didn't glow).
>
>Paxton
>Astoria, OR
>
Hi
When at Intel, we had to shield our Series II machine for a different
reason. The early ones would reset when zapped by someone walking
across the carpet and touching the key board. Energy can go in various
directions. It could have been for security but was just as likely
to keep from interfering with the various measurement equipment.
Dwight
