Detecting ROM Version
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Detecting ROM Version
Let's say I want to auto-detect what ROM version (TI-82) someone has.
Could someone send me some (preferably tested) source code. This is vital
information for the project I'm working on. So far I've got nothing except
a half a dozen calculator crashes. Here is my best lead for source code:
#include "ti-82.h"
.ORG 0
.DB "Test ROM Ver.",0
ROM_CALL(CLEARLCD)
ld hl,0 ; 0 -> l, 0 -> h
ld (CURSOR_POS),hl ; l -> (CURSOR_ROW), h -> (CURSOR_COL)
ld A, %10001111 ; Switch to ROM page 7
out (2), A
ld A, ($7FFF) ; Now A should have the version byte
; (note, on the TI-85, it's not the same as the
; actual number, so you'll have to have a list of
; equivelancies in your program).
push af ; Temporarily store A on the stack
ld A, %10001000 ; Switch to ROM page 0
out (2), A
pop af ; Recall A from the stack
ROM_CALL(TX_CHARPUT) ; Display A
KeyLoop:
ROM_CALL(_getkey)
cp $40
ret Z
jr KeyLoop
.END
The program seems to work fine until I attempt to exit, at which point it
locks up. The lines which switch to ROM page 0 are probably incorrect
because I don't know which ROM page to return to. Any help would be
appreciated.
TIA,
Thomas J. Hruska
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