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Solar Powered Computer
Topic: Homebrew Posted:2004-04-20
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I modified an Odyssey 2 computer so that it runs on solar power. The Odyssey 2 has a 12 VDC power supply; however, this just goes in to a voltage regulator that brings the power down to 5 VDC. So, I am able to run the power down to 10V. I changed the charge control program so that it turns off the Odyssey 2 when the voltage gets to 10V.

Here is a picture:

Here is the assembly listing:

;
;  8048 Disassembly of solody.bin
;  04/20/04 5:25
;
org     0
;
clr     a
outl    p2,a
mov     a,#80h
outl    p2,a
X0005:  in      a,p1
mov     r0,#0f2h
cpl     a
add     a,r0
jnc     X001f
in      a,p1
mov     r0,#0e3h
cpl     a
add     a,r0
jc      X002f
jmp     X0005
;
org     1fh
;
X001f:  mov     a,#0a0h
outl    p2,a
jmp     X0005
;
org     2fh
;
X002f:  nop     ; data truncated
;
org     32h
;
in      a,p1
mov     r0,#0a7h
cpl     a
add     a,r0
jc      X003f
mov     a,#0e0h
outl    p2,a
jmp     X0005
;
org     3fh
;
X003f:  in      a,p1
mov     r0,#0dfh
cpl     a
add     a,r0
jnc     X004f
mov     a,#0c0h
outl    p2,a
jmp     X003f
;
org     4fh
;
X004f:  mov     a,#0e0h
outl    p2,a
jmp     X0005
;;
end
;

Here is an image of the ROM.

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