st901745@pip.cc.brandeis.edu (12/06/90)
I am an avid user of HP calculators, I have 3 HP-11Cs, 1 HP-32, 1 HP-28C (Rev 1BB) and an HP-48SX (Rev C) and have a few questions and comments. 1) Where can I get ASC-> and ->ASC (I cannot find a working copy) 2) Under which rubber foot is the reset button? 3) I found a neat 'thingy' with the ON-D. I know it works on the REV C and D calculators. Type ON-D <- (backarow) ENTER 9 (the top row will shift over a bit) type 9 again (screen gets dimmer) type 9 again (screen will turn all black and slowly (depends on battery life) the screen will "disolve." Once you are in this "mode" it is sorta hard to get out (you must hit ON-C several times). I would like to know if this is bad for my 48SX? 4) What does ON-D MATH do? (you get some stuff on the screen and a continual beeping). -Alastair Bor
malloy@nprdc.navy.mil (Sean Malloy) (12/07/90)
In article <00940BEE.C00A4E80@pip.cc.brandeis.edu> st901745@pip.cc.brandeis.edu writes: >3) I found a neat 'thingy' with the ON-D. I know it works on the REV C >and D calculators. Type ON-D <- (backarow) ENTER 9 (the top row will >shift over a bit) type 9 again (screen gets dimmer) type 9 again (screen >will turn all black and slowly (depends on battery life) the screen will >"disolve." Once you are in this "mode" it is sorta hard to get out (you >must hit ON-C several times). I would like to know if this is bad for my >48SX? First, a request. Place carriage returns in your postings about every 70 characters or so; some newsreaders don't wrap lines. Try continuing to press the 9 key; I get a display with a number of vertical lines of varying intensity. After a five more presses of the 9 key (after each keypress, the vertical lines move), the screen goes blank. Pressing ON at that point will wake the calculator up after about a second. Sean Malloy | Navy Personnel Research & Development Center | We'll get along just fine as San Diego, CA 92152-6800 | soon as you realize I'm God. malloy@nprdc.navy.mil |
akcs.dnickel@hpcvbbs.UUCP (Derek Scott Nickel) (12/07/90)
ON-D MATH is the ESD (Electrostatic Discharge) tes (I think)
jthornto@fs1.ee.ubc.ca (THORNTON JOHAN A) (12/08/90)
In article <00940BEE.C00A4E80@pip.cc.brandeis.edu> st901745@pip.cc.brandeis.edu writes: >3) I found a neat 'thingy' with the ON-D. I know it works on the REV C >and D calculators. Type ON-D <- (backarow) ENTER 9 (the top row will >shift over a bit) type 9 again (screen gets dimmer) type 9 again (screen >will turn all black and slowly (depends on battery life) the screen will >"disolve." Once you are in this "mode" it is sorta hard to get out (you >must hit ON-C several times). I would like to know if this is bad for my 48SX? Pressing ON-D, backspace, enter causes the memory scanner/editor to go to address #00100h, which is where the HP48SX's display controller is. #00100h: bits 0-1 control the 4 pixel offset of the display. Useful for smooth scrolling. Bit 2 is also involved here but messes up the scan length. Bit 3 seems to put the machine into a coma #00101h: LSBs of the 5 bit contrast control word. #00102h: bit 0 is the MSB of the contrast. Bits 1 and 3 control the voltage difference across the LCD; this is what you modified. Can't see what bit 2 does. #00103h: bit 3 is also involved in the LCD voltage control. #0010Bh: bit 0,1,2,3: \<-, \->, alpha, and alarm indicators #0010Ch: bit 0,1: busy and I/O indicators; bit 3 must be set for the indicators to be on. #00120h - #00124h: display address base register. Ususally set to #F097Ch (or #F09BC with the equation card installed) but you can change it, to look at any memory you want. Note that you can't read this register, just write to it. Remember to type addresses in backwards. #00125h - #00127: amount of overscan per pixel line #00128h : offset to menu area bitmap, normally 7. #00129h : bits 0-1 control the location of the menu area, normally 3. Don't mess with bit 2, which can totally remap your calculator's display! ON-C does not fix what happens, but turning it off does, strangely enough. ------- _/__/ ----------------------------------------------------- _| ___| E l e c t r i c a l | Johan Thornton, Esq. | | |_/ E n g i n E E r i n g |------------------------- |/| __| U n i v e r s i t y | jthornto@fs1.ee.ubc.ca |-| |/__ o f B r i t i s h |------------------------- | |_____| C o l u m b i a | This space for rent ---- |__|/_| ------------------------------------------------------