Look what I found d8-)

[Geoff Quickfall]

Going through my old university file boxes and found this:

Or maybe I was dreaming.

d8-)

Cheers, Geoff

Edited: 29 Nov 2010, 3:20 p.m.

[BruceH]

You dream in color!

[Juergen Keller]

Looks amazing but this shoots one of the main features of the Voyager Series, the long battery life ;-)

BTW, a tube display like in this Casio mini calculator would also be a nice option:

Cheers,
Juergen

[Geoff Quickfall]

It was the casio mini which started my miscellaneous collection. What a blast!

Geoff

[Walter B]

Your dream carries the wrong label: in fact this was the HP-15T - the 25.4mm Thick predecessor of the renowned 15C, carrying a 150g rechargeable NiCd in its rucksack.

Maybe I don't remember it correctly, but didn't we see this some years ago already?

[Maximilian Hohmann]

Cool!

A couple of years ago, we had some kind of brainstorming session here. This is "my" expandable 4-banger with panaplex display (and yes indeed: I would rather carry 500 grams of (recharchable) batteries with me than look at one of those awful LCDs :-) ):

Cheers, Max

Edited: 29 Nov 2010, 5:06 p.m.

[Geoff Quickfall]

I take it you have on of these Max,

98 lines of programming, 4.5 pounds fully loaded and fits in a LARGE RAINCOAT pocket:

[Namir]

Any program flow control commands for the CompuCorp?

[Geoff Quickfall]

Nope!

I use the start/stop at a logic choice. For example the great circle heading program requires a test for a -ve value which determines the east or south direction (360 +). When the program pauses it displays a +ve or -ve value for the sine of the heading. If negative pressing start/stop calculates the reciprocal value of the heading and displays that.

You will notice prgm 1&2 switch. Each program is 49 lines and switching to the other allows a program to continue.

Interestingly, if you input the values in the stack at the correct points while programming the display shows your progress!

Cheers

here are two programs, one resides at position 1 and the other at 2 using the switch. You can see that if the sine is negative then the last routine in program two will switch the heading for you. See the explanation in program two contained by the ***

PROGRAM LISTING  Great circle distance

RCL 3		

-

RCL 1

=			A

SIN/COS

2ND

STO 4

RCL 0

SIN/COS

2ND			B

STO * 4

RCL 2

SIN/COS

2ND			C

STO * 4

RCL 0

SIN/COS

*			D

RCL 2

SIN/COS

=

+

RCL 4

=

SIN-1/COS-1		E

2ND

STO 5

*			

60		        F

=

STOP

PROGRAM SECTION EXPLANATION

A = COS(LON.I – LON.F)

B = COS(LAT.I)

C = COS(LAT.F)

D = SIN(LAT.I) * SIN(LAT.F) +

    A * B * C

E = ARCOS(D)

F = DISTANCE NM

USE IN PLACE OF 60

69 		FOR SM

111.11  	FOR KM

VARIABLE		REGISTERS

LAT.I			0

LON.I			1

LAT.F			2

LON.F			3

A			4

A * B			4

A * B * C		4

DISTANCE ARC		5

____________________________________________________

____________________________________________________

PROGRAM LISTING GREAT CIRCLE BEARING  

RCL 0

SIN/COS

2ND

*		A

RCL 5

SIN/COS

=

STO 6

RCL 0

SIN/COS

*

RCL 5		B

SIN/COS

2ND

=

STO 7

RCL 2

SIN/COS		C

-

RCL 7

/			

RCL 6

=

SIN-1/COS-1	D

2ND

STO 8

STOP

RCL 1

-

RCL 3

=		E

SIN

STOP

360

-		F

RCL 8

=

STOP

PROGRAM SECTION EXPLANATION

A = cos(LAT.I) * sin(DIST ARC)

B = sin(LAT.I) * cos(DIST ARC)

C = sin(LAT.F) - (sin(LAT.I) * cos(DIST ARC)

D = COURSE                                  *** the course

E = TEST FOR NEGATIVE SIGN                      will be a +VE

F = IF SIGN NEGATIVE EXECUTE F FOR              number but is it

    CORRECT BEARING.                            correct? Pressing

                                                st/st displays the

VARIABLE			REGISTERS       sine and its      

LAT.I				0               value allowing the

LON.I				1               user to make the

LAT.F				2               correct choice***

LON.F				3

DISTANCE ARC			5

BEARING FOR SIGN TEST	        8

Edited: 29 Nov 2010, 10:12 p.m.

[hpnut]

this is not an RPN machine, witness the = key. :-(

[Geoff Quickfall]

took it to work one day and the coolness meter went off the dial.

Yeah, not RPN but still NEAT!

d;-)

[Walter B]

I remember this standing in the math department of our university in mid seventies. Students were allowed to do some calculations there, if we needed a numerical solution at all ...

[Maximilian Hohmann]

Hi!

Quote:

---

I take it you have on of these Max...

---

One? Last week I was finally able to fill one of the few remaining gaps: I found a 360/365 Bond Trader on the American eBay site. Can't wait to get it... Now there's only the 360 Bond Trader and the non-programmable Statistian (340) left to find.

If for some reason one day I'm only allowed to keep one single calculator, it's probably going to be a Compucorp and not an HP. But don't tell anybody here ;-)

Regards, max

[Geoff Quickfall]

NT

[Namir]

This model exists in several parallel universes ... but not ours!

:-(

Namir

[Geoff Quickfall]

There are some interesting alternate realities, even here!

Geoff

[Walter B]

Including those with slow watches ... ;)

[Alberto Fenini]

I was restoring an HP55 and I'm working on a 65 card reader,

seriously, any way to connect the two ??

I'd love the timing capability of the 55 with the ability to

store programs and read them off the cards.

The architecture of the two (55 and 65) is similar enough to make it

worth a try ??


Suggestions,as always are all welcome, Alberto

[Geoff Quickfall]

In which way, add a timing circuit to the HP-65? Problem is, though it has a timing circuit for program execution it does not have code to interpret the timing function for display purposes such as the HP 45 (hidden) or the HP 55.

You can always time your loops with pauses introduced on the 65 then come up with a correction factor if you want to use it as a crude timing device. But I do not see any way of introducing the quartz crystal into the system to have a timing display, unless you write a program to display at each blink now that the crystal is in place.

You would have to identify the circuit used for the timing, see this posting on the HP 45:

HP 45 conversion to quartz

HP museum article

cheers

[Alberto Fenini]

Actually I was thinking at the viceversa ... adding a card reader to an HP55

May be I'm wrong, but it shouldn't be impossible

the back case will be taken from an HP65, but if the connections
are all available it could be done.

All the card reader electronic is on the card reader pcb

to the main board only a couple of voltages and the ReadA, ReadB, WriteA, WriteB signas get connected

I know it's kind of meaningless, but it's worth a try,
only I don't
have the schematics for the HP65 and 55 to check whether these points
may be available on both boards.

At the end of the day, the card reader reads from the card and writes to the memory.

Since programming techniques are very different from 65 to 55, I can accept the limit that only "55 mode" programs will be written and read back by this "hybrid" unit, but in theory it should work.

I don't know, but it's kind of fascinating to me (just to me ??)

Take care Alberto