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[Reply #30 on:]

Only a keel will be more than a few inches and we are still trying things (like self righting) that may make that minimal also.

[Reply #31 on:]

Originally I was using my SYM-1 (that's a 6502 single board computer with 32K of RAM, running @ 1Mhz) to process the data, using 3 ADC0804's.

 [smiley=thumbsup.gif]

SYM-1 6502.  You've got the upgraded version.. I think the model I used was 4k, the interface a hex keypad and the display (if I remember) six 8-segement LED's.  Some of the first programming I ever did was on one, in assembler, circa 1980.  We talking about the same monster, screw mounted on a sheet of laminate plywood (with too rough edges?)

[Reply #32 on:]

Well, if you get desperate you could use a towed array, that would get deep enough.

[Reply #33 on:]

I seem to remember reading somewhere that capacitance could be used to detect nearby bodies in water...  Somewhat similar to a the way a theremin works.

[Reply #34 on:]

6502 - BTDT, but I had a "deluxe" model in the early 80s. I had an Atari 400, which was the same as the 800 with a few less bells and whistles, including the beer proof template keyboard. I programmed it in assembly also. I still remember that page 0 indirect addressing scheme; that was pretty slick for the era. I also had a Franklin at one point.

[Reply #35 on:]

The 6502 was the first REAL RISC!
Only 157 instructions!
Z80 twits used to brag about how many registers they had, oh, and that damn block copy!
6502 had so many different ways to do indirect and indexed addressing, it made it hard to port code to anything other than 6809 or 68000!

What's this programming in assembler?! I used to hand assemble!
Still do! (I like to suffer)
My first contact with the Atmel processors was hand assembled code on the AT90S8535.

[Reply #36 on:]

"I remember working with nothing but ones and zeros; we couldn't even afford ones for the early stuff. Had to do it with nothing but zeroes..."

OK, you win.   I did do defines when I would use an oddball instruction or two, like SIM and RIM to set/read the interrupt mask on the 8085 (8080 did not have those instructions and I was using an 8080 assembler) and I have punched in boot sequences from a cheat sheet by jand. But hand assembling more than a few instructions? No...

[Reply #37 on:]

Wimp!
lol

[Reply #38 on:]

Ouch - another very old synapses just fired...

I did not do defines, I did equates as in:

SIM EQU 0x20
RIM EQU 0x30

Wow - that hurt...  ;D  ;D  ;D