diff options
Diffstat (limited to 'src')
| -rw-r--r-- | src/driver.s | 10 | ||||
| -rw-r--r-- | src/jetpac.s | 7 |
2 files changed, 15 insertions, 2 deletions
diff --git a/src/driver.s b/src/driver.s index 1449de5..1ac5718 100644 --- a/src/driver.s +++ b/src/driver.s @@ -49,6 +49,15 @@ ;; this, but we have plenty of RAM left. zp_pause_toggle = $39 + ;; Initialization routine that is to be called before enabling NMIs back for + ;; the first time. + .proc init_before_nmi + lda #0 + sta Driver::zp_pause_toggle + + rts + .endproc + ;; Switch from the title screen to the main screen. Note that this function ;; is to be called with the PPU disabled. If that's not the case, then it ;; will set the proper values to disable it on the next `nmi` call and set @@ -157,7 +166,6 @@ lda #0 sta zp_pause_timer sta Driver::zp_moved_out - sta Driver::zp_pause_toggle ;; Initialize variables for sprite cycling. sta zp_next_bullet_cycle diff --git a/src/jetpac.s b/src/jetpac.s index 5c1c099..52ec1f7 100644 --- a/src/jetpac.s +++ b/src/jetpac.s @@ -121,7 +121,8 @@ sta PPU::zp_control ;; Initialize other global variables which the rest of the game assume to - ;; have zero as their initial values. + ;; have zero as their initial values. Note that it's important to have these + ;; variables defined before sta Globals::zp_flags sta Joypad::zp_buttons1 sta Joypad::zp_buttons2 @@ -146,6 +147,10 @@ ;; Initialize some variables from the "Game Over" side of the game. jsr Over::init + ;; Initialize variables from the game's driver that need to be set before + ;; NMIs start ticking. + jsr Driver::init_before_nmi + ;; Initialize some PAL-specific constants. .ifdef PAL lda #0 |