26 Dec
1999
26 Dec
'99
5:27 p.m.
--- Tony Duell <ard(a)p850ug1.demon.co.uk> wrote:
Those lamp panels (144 lamps IIRC) are fun.
They're used on other DEC
peripherals as well -- the RK11-C can take one (where it displays most of
the registers, etc).
I've seen those mentioned in the appropriate handbooks. I even have
an RK-11C that would be much easier to debug (not to mention more fun)
with a panel of blinkenlights. Presumably, one could be fabricated with
easier-to-find lamps than the DEC originals (at least, _I_ only have a
handful of spares).
-ethan
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26 Dec
26 Dec
8:16 p.m.
New subject: Blinkenlightes on micros (was: Lamp panels
On or about 08:27 PM 12/26/99 -0800, Ethan Dicks was caught in a dark alley
speaking these words:
I've seen those mentioned in the appropriate
handbooks. I even have
an RK-11C that would be much easier to debug (not to mention more fun)
with a panel of blinkenlights. Presumably, one could be fabricated with
easier-to-find lamps than the DEC originals (at least, _I_ only have a
handful of spares).
What would it take to put some blinkenlights (safely) on a micro, say a
CoCo or a C64? Would it just take buffering the data & address lines (if
unbuffered, like on the CoCo) and adding the requisite current-limiting
resistors & LED's?
Also, if you need to buffer the busses on a 1-2Mhz micro, would that add
delay to the busses that one would need to account for?
Just a few random thoughts for a project I don't have time for... ;-)
Happy Holidaze,
Roger "Merch" Merchberger
=====
Roger "Merch" Merchberger -- zmerch(a)30below.com
SysAdmin - Iceberg Computers
===== Merch's Wild Wisdom of the Moment: =====
Sometimes you know, you just don't know sometimes, you know?
8:35 p.m.
New subject: Blinkenlightes on micros (was: Lamp panels
What would it take to put some blinkenlights (safely)
on a micro, say a
CoCo or a C64? Would it just take buffering the data & address lines (if
unbuffered, like on the CoCo) and adding the requisite current-limiting
resistors & LED's?
Somewhere on Sunsite (Metalab) there is a bunch of info on how to add stuff
like this to a Linux box. Though I think the info is basically for load
meters.
Zane
| Zane H. Healy | UNIX Systems Adminstrator |
| healyzh(a)aracnet.com (primary) | Linux Enthusiast |
| healyzh(a)holonet.net (alternate) | Classic Computer Collector |
+----------------------------------+----------------------------+
| Empire of the Petal Throne and Traveller Role Playing, |
| and Zane's Computer Museum. |
| http://www.aracnet.com/~healyzh/ |
27 Dec
27 Dec
7:42 a.m.
New subject: Blinkenlightes on micros (was: Lamp panels
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8:48 a.m.
New subject: Blinkenlightes on micros (was: Lamp panels
That would certainly work (and wouldn't damage the
computer), although I
don't know that you'd see anything useful on lights that were changing at
1MHz. Most machines with frontpanels had a way to single-step the CPU
from the panel.
Used to run an altair with a 4mhz z80 and the lights do tell a lot. You
can see it spinning in polled io loops and math routines where processor
cycles are eaten big time. Sure the low order lights are generally dim
glow but over time you get familiar with that glow and its subtle changes.
Allison
7:34 a.m.
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8951
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5 comments
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allisonp＠world.std.com -
ard＠p850ug1.demon.co.uk -
ethan_dicks＠yahoo.com -
healyzh＠aracnet.com -
zmerch＠30below.com