[HP35S] Disassembling ROM

[Thomas Ritschel]

Looking at the hex dump of the file 35s.sml, there seems to be a code segment starting at $85c0. The output of the DCC6502 disassembler looks like some legit 6502/8502 code:

Code:


$85C0> D8:    CLD        ;
$85C1> A2 96:    LDX #$96    ;
$85C3> A0 C8:    LDY #$c8    ;
$85C5> EA:    NOP        ;
$85C6> 88:    DEY        ;
$85C7> D0 FC:    BNE $85C5        ;
$85C9> A0 C8:    LDY #$c8    ;
$85CB> CA:    DEX        ;
$85CC> D0 F7:    BNE $85C5        ;
$85CE> A9 FF:    LDA #$ff    ;
$85D0> 85 07:    STA $07        ;
$85D2> A9 00:    LDA #$00    ;
$85D4> 85 06:    STA $06        ;
$85D6> 85 08:    STA $08        ;

BTW: There are some more "human readable" parts in the file, e.g. the constants library (speed of light, etc.) starting at $18750, some warning messages starting at $201c0, the messages of the self test starting at $e7f0, and a lot of function names and symbols every here and there, e.g. starting at $182f0.

If there is no checksum, one could easily poke around...