Much of what used to be power-hungry connectivity hardware for me has
gone low-power, so I'm scaling back my UPS setup some.
I've got an Elgar IPS1100, nominally rated at 1KVA sine-wave continuous
(9.2A 60 Hz 120VAC). It's a pretty good-sized UPS, with fan cooling.
It takes 48V in SLA cells (has an internal shelf for 8 6V 12AH ones),
but I've always run it from 4 garden-tractor batteries.
It's pretty good-sized; about 12"x13"x15" and heavy (big transformer).
Made in 1990, has 6 AC receptacles on the back along with an RS-232
connector for status notification.
Back in the day, this was a pretty high-end unit; manufacture date is 05/90.
Yours for shipping; batteries not included.
is the 12 the thing that looks like a trs 80 mod 2 in size? if so i
what is the history behind your unit!?!?!?!?!?!?
Yes--- I am in Phx! Ed#
In a message dated 4/23/2017 8:14:33 P.M. US Mountain Standard Time,
cctalk at classiccmp.org writes:
Just picked up a TRS-80 Model 12, and it boot to the "insert disk
prompt" ... Yay!
But, no card cage, and no KB (and no disks, but those might be easier to
Found a seller of a model 12 with these items, but local pickup only.
I'd like to get this unit up to the Model 16 specs, with Xenix on it. I
see the cards are available, but without the cage, no joy.
brain at jbrain.comwww.jbrain.com
I'm in the process of building and restoring a PDP-8/e, and now I've got a
second serial card I'd like to give OS/8 a try.
I'm pretty sure I've got the boot loader entered properly, and the address
+ baud rates set correctly on the PDP and PC.
When I start os8diskserver with "./os8disk -1 ../disks/diagpack2.rk05", it
gives the welcome message. When I start the 8/e, It says:
Done sending block 0
^ and appears to freeze there. (the 8/e doesn't halt)
I've got a RS-232 tester (blinky light box) hooked up to the port, which
seems to indicate that nothing is being sent after Block 0 has been sent.
Does anyone know what's going on, or what I'm doing wrong?
all fine with Rigol or similar oscilloscopes, but there's a very important
technical specification that often is not considered, which really DOES the
difference between a cheap oscilloscope and a powerful one: waveforms per
Suppose you are searching for a rare glitch, or that you are trying to
trace an edge of a signal with infinite persistence.
If the scope is a DSO, it just takes a sampling window, the memory is full
and requires data processing and display, in the meantime the signal is not
analyzed, and you can lose important events.
A DPO can capture the signal continuously, or at least with very short
death time, and the display is updated using a large number of triggered
Of course this kind requires a far powerful acquisition circuit.
I really like DPO scopes in place of DSO, for example used Tek TDS540C or
D, they are quite cheap, no electrolytic caps, and can be optionally
expended to increase acquisition memory depth.
Display is small and grey, but you can use a VGA monitor.
My two cents.
The RICM just received $1,000 to buy a new oscilloscope. I would like a
four channel. and color would also be nice. The bandwidth doesn't need to
be high because we usually work on ancient equipment.
What would you suggest?
Has anyone got a manual for an HP 1331A X-Y display? It's a storage-tube
device, and I'm curious to know if there's a way of triggering the erase
function remotely rather than having to physically prod the erase button on
The rear just has X-Y-Z inputs, and I *think* that X-Y are supposed to be
in the order of +/- 1V, while Z is the intensity with 0V being full and
around 1V being off. Maybe throwing a negative voltage at Z erases, or