Add system-specific boot symbols and CPU instruction tests

Introduced symbol files for various Game Boy systems (CGB, AGB, MGB, SGB) to define boot sequences and functionalities. Included CPU instruction behavior tests, with detailed coverage of standard operations and interrupt handling. Added documentation for test execution and internal framework operations.

cpu_instrs/source/08-misc instrs.s

@@ -0,0 +1,110 @@
+; Tests miscellaneous instructions
+
+;.define PRINT_CHECKSUMS 1
+.include "shell.inc"
+.include "instr_test.s"
+
+instrs:
+     .byte $F0,$91,0   ; LDH  A,($91)
+     .byte $E0,$91,0   ; LDH  ($91),A
+     .byte $F2,$00,0   ; LDH  A,(C)
+     .byte $E2,$00,0   ; LDH  (C),A
+     .byte $FA,$91,$FF ; LD   A,($FF91)
+     .byte $EA,$91,$FF ; LD   ($FF91),A
+     .byte $08,$91,$FF ; LD   ($FF91),SP
+     .byte $01,$23,$01 ; LD   BC,$0123
+     .byte $11,$23,$01 ; LD   DE,$0123
+     .byte $21,$23,$01 ; LD   HL,$0123
+     .byte $31,$23,$01 ; LD   SP,$0123
+     .byte $F5,0,0     ; PUSH AF
+     .byte $C5,0,0     ; PUSH BC
+     .byte $D5,0,0     ; PUSH DE
+     .byte $E5,0,0     ; PUSH HL
+     .byte $F1,0,0     ; POP  AF
+     .byte $C1,0,0     ; POP  BC
+     .byte $D1,0,0     ; POP  DE
+     .byte $E1,0,0     ; POP  HL
+instrs_end:
+
+test_instr:
+     ; C = flags register
+     ld   c,$00
+     call test
+     ld   c,$10
+     call test
+     ld   c,$E0
+     call test
+     ld   c,$F0
+     call test
+     ret
+
+test:
+     ; Fill RAM
+     ld   a,$FE
+     ld   ($FF90),a
+     ld   a,$DC
+     ld   ($FF91),a
+     ld   a,$BA
+     ld   ($FF92),a
+     
+     ; Fill stack
+     ld   a,$13
+     ld   ($DF80),a
+     ld   a,$57
+     ld   ($DF80-1),a
+     ld   a,$9B
+     ld   ($DF80-2),a
+     ld   a,$DF
+     ld   ($DF80-3),a
+     
+     ; Set registers
+     ld   b,$12
+     push bc
+     ld   bc,$5691
+     ld   de,$9ABC
+     ld   hl,$DEF0
+     pop  af
+     
+     ; Switch stack
+     ld   (temp),sp
+     ld   sp,$DF80-2
+     
+     jp   instr
+instr_done:
+     ; Save new SP and switch to another stack
+     ld   (temp+2),sp
+     ld   sp,$DF70
+     
+     call checksum_af_bc_de_hl
+     
+     ; Checksum SP
+     ld   a,(temp+2)
+     call update_crc_fast
+     ld   a,(temp+3)
+     call update_crc_fast
+     
+     ; Checksum RAM
+     ld   a,($FF90)
+     call update_crc_fast
+     ld   a,($FF91)
+     call update_crc_fast
+     ld   a,($FF92)
+     call update_crc_fast
+     
+     ; Checksum stack
+     ld   a,($DF80)
+     call update_crc_fast
+     ld   a,($DF80-1)
+     call update_crc_fast
+     ld   a,($DF80-2)
+     call update_crc_fast
+     ld   a,($DF80-3)
+     call update_crc_fast
+     
+     ; Restore SP
+     ldsp temp
+     
+     ret
+
+checksums:
+     .byte $4D,$FF,$15,$97,$6D,$A7,$35,$65,$4D,$FF,$15,$97,$6D,$A7,$35,$65,$4D,$FF,$15,$97,$6D,$A7,$35,$65,$AD,$FA,$5E,$41,$D0,$78,$79,$C1,$AF,$66,$99,$34,$0D,$E1,$97,$99,$6F,$D0,$6F,$5D,$C3,$1F,$A3,$8A,$C2,$F1,$9C,$F3,$C1,$C3,$DC,$78,$C0,$2D,$E3,$01,$8F,$C4,$0F,$44,$95,$22,$6A,$39,$61,$C5,$AB,$55,$FB,$DF,$2C,$52,