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Boot-up B register values #75

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Boot-up B register values #75

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57a3af3
Add BOOTUP_B_DMG0
dmitry-shechtman Aug 12, 2025
8c9d6cd
Remove BOOTUP_B_CGB and BOOTUP_B_AGB
dmitry-shechtman Aug 12, 2025
79caa98
Merge branch 'dmg0' into b_squish
dmitry-shechtman Aug 12, 2025
f437856
Group boot-up B values
dmitry-shechtman Aug 12, 2025
36b77b2
Add BOOTUP_B_* to hardware_compat.inc
dmitry-shechtman Aug 12, 2025
492fd92
Merge branch 'b_agb' into b_squish
dmitry-shechtman Aug 12, 2025
debac99
Add explanation for BOOTUP_B_* removal
dmitry-shechtman Aug 13, 2025
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5 changes: 2 additions & 3 deletions hardware.inc
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Original file line number Diff line number Diff line change
Expand Up @@ -1037,10 +1037,9 @@ def BOOTUP_A_MGB equ $FF
def BOOTUP_A_SGB equ BOOTUP_A_DMG
def BOOTUP_A_SGB2 equ BOOTUP_A_MGB

; Register B = CPU qualifier (if A is BOOTUP_A_CGB)
; Register B = CPU qualifier
def BOOTUP_B_DMG0 equ $FF
def B_BOOTUP_B_AGB equ 0
def BOOTUP_B_CGB equ 0 << B_BOOTUP_B_AGB
def BOOTUP_B_AGB equ 1 << B_BOOTUP_B_AGB

; Register C = CPU qualifier
def BOOTUP_C_DMG equ $13
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5 changes: 5 additions & 0 deletions hardware_compat.inc
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Expand Up @@ -385,6 +385,11 @@ def OAM_B equ OAM_SIZE

def BOOTUPB_B_AGB equ B_BOOTUP_B_AGB

; These values should not be relied upon; see
; https://gbdev.io/pandocs/Power_Up_Sequence.html#cgbdmg_b
def BOOTUP_B_CGB equ 0 << B_BOOTUP_B_AGB
def BOOTUP_B_AGB equ 1 << B_BOOTUP_B_AGB


;******************************************************************************
; Aliases
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