home
***
CD-ROM
|
disk
|
FTP
|
other
***
search
/
The X-Philes (2nd Revision)
/
The X-Philes Number 1 (1995).iso
/
xphiles
/
hp48hor2
/
drain29.doc
< prev
next >
Wrap
Text File
|
1995-03-31
|
5KB
|
102 lines
(Comp.sys.hp48)
Item: 1440 by dougc@bert.cs.byu.edu [Douglas R. Cannon]
Subj: HP 48 battery drain table update (SX and GX)
Date: 03 Aug 1993
Here is an update to DRAIN.DOC (goodies disk #6). I've tested every
operation that I could think of on an SX (rev E), GX (rev L), and GX
(rev M).
The differences between the rev L GX and rev M GX were significant, so
I'm putting them in separate columns. I'm sure that the main reason
for the differences is the newer LCD screen used in the rev M machine.
Although the new LCD screen is slower, it looks like it draws less
current. There may be other hardware design differences as well, so I'm
not sure if the LCD screen is actually the reason for the smaller current.
I would venture to guess that any ROM version past M will be very similar
to the version tested here. I didn't have time to test all functions
on the version M ROM GX, but you get the general idea. It's not really
useful to have a totally exhaustive list anyway. This will give you a
good idea of what's going on. If anyone wants to make a more complete
list, then be my guest.
Some of these current measurements may be different than in DRAIN.DOC.
The batteries are to blame for this. If your batteries are fresh, then
the current will be noticeably different than if they've been used for
a while. I used 3 brand new Duracell AAA batteries for this test.
I used the same batteries when testing all machines. All batteries
measured slightly > 1.5 V each, before and after the tests. The SX used
here is the same one that I used for DRAIN.DOC.
This is the current drawn from the batteries, given the operation:
Current (mA) 3
SX:E 3 GX:L 3 GX:M 3 Operation
ÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
-- 3 -- 3 -- 3 Coma mode [ON]-[SPC]
-- 3 -- 3 -- 3 Off
2.2 3 4.8 3 4.3 3 idle, RAM empty
2.2 3 4.8 3 4.3 3 idle, RAM full
2.2 3 4.8 3 4.3 3 idle, contrast as dark as possible
2.2 3 4.8 3 4.3 3 idle, contrast as light as possible
< 4.6 3< 6.0 3< 5.6 3 idle, Clock on in status line (fluctuates a lot)
3.3 3 7.0 3 6.2 3 Command line input/Edit
6.2 3 14.1 3 3 holding down [ON]
3 3 3
6.5 3 16.5 3 14.2 3 User-RPL loop
5.1 3 12.0 3 11.1 3 fEVAL of User-RPL loop (LCD screen turned off)
6.3 3 15.9 3 13.9 3 system-RPL loop
4.9 3 11.7 3 10.8 3 fEVAL of system-RPL loop (LCD screen turned off)
4.9 3 13.7 3 11.5 3 machine language loop
3.4 3 9.2 3 8.5 3 fEVAL of machine language loop (LCD screen turned off)
3 3 3
6.3 3 16.3 3 14.1 3 BEEP (600 Hz)
8.1 3 17.9 3 15.7 3 BEEP (6000 Hz)
8.6 3 18.3 3 16.3 3 BEEP (>= 10000 Hz)
3 3 3
6.3 3 16.6 3 3 Tetris 1.52 by Detlef Muller (sys-RPL)
5.2 3 13.5 3 3 Diamonds by Doug Cannon (ML)
3 3 3
ÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄ RAM CARDS ÄÄÄÄ HP 128Kb cards ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
3.2 3 6.7 3 6.1 3 idle, 1 card (either port) freed
3.2 3 6.7 3 6.1 3 idle, 1 card merged
4.5 3 8.6 3 7.8 3 idle, 2 cards freed
4.5 3 -- 3 -- 3 idle, 2 cards merged
3 3 3
ÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄ WIRE TRANSMISSIONS ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
2.2 3 4.8 3 4.3 3 idle, connected, IO port closed
3.1 3 6.9 3 3 idle, connected, IO port open
7.9 3 19.0 3 3 receiving from IBM
7.8 3 18.4 3 3 sending to IBM
3 3 3
ÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄÄÄÄÄÄÅÄ IR TRANSMISSIONS ÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
2.5 3 5.3 3 4.7 3 idle, IO port open
7.0 3 16.8 3 3 trying to connect
9.8 3 18.7 3 3 sending to another HP48
15.6 3 43.0 3 38.0 3 (!) PRLCD (printing, no IR printer nearby)
ÄÄÄÄÄÄáÄÄÄÄÄÄáÄÄÄÄÄÄáÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄÄ
A couple of notes:
Pressing ON does not close the I/O port, but turning the HP OFF, then ON,
the port is closed. ( I guess the manual wasn't kidding when it said to
always close the port! )
Conclusions? Well, I can say that all GX owners will be buying batteries
more often than SX owners! And, if you play games, play Diamonds, not
Tetris! (just kidding, Detlef :)
I placed an ammeter in series with the batteries to make these measurements.
I feel that the measurements are good, since the ammeter I used has only
a 250 mV maximum burden at fullscale deflection of 200 mA.
My ammeter was not capable of measuring the OFF or COMA modes, which
means that they are less than 2 mA. If anyone has a more accurate device
and can make these measurements, then please do, and send them to me.
---------------------
Douglas R. Cannon
dougc@bert.cs.byu.edu
---------------------