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custom 5200 splash screen year 2023

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pkali
2023-01-12 20:34:04 -05:00
parent c7b5a07c62
commit 8ac3c22fe7
2 changed files with 19 additions and 12 deletions
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scorch.asm
+19 -12
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@@ -233,7 +233,7 @@ FirstSTART
.IF TARGET = 5200
; start in 5200 diagnostic mode
; move original startup procedure to RAM
Atari5200Splash = $2100 ; apparently there is some free space here
Atari5200Splash = $2100 ; apparently there is some free space here
; 6502 initialization
SEI
CLD
@@ -243,22 +243,29 @@ Atari5200Splash = $2100 ; apparently there is some free space here
mwa $fffc temp ; startup proc address
mwa #Atari5200Splash temp2
mwa #Atari5200Splash+$16f modify
mwa #Atari5200Splash+$16b modify
jsr CopyFromROM
; modify the end of the splash screen
lda #$4c ; JMP
sta (temp2),y
iny
lda #<Atari5200AfterSplash
sta (temp2),y
iny
lda #>Atari5200AfterSplash
lda #$60 ; JMP
sta (temp2),y
jmp Atari5200Splash+$0f ; after the diag cart detection
jsr Atari5200Splash+$0f ; after the diag cart detection
; modify the text
splash_text = $3c80 ; '.scorch.supersystem.copyright.19xx.atari'
splash_year = splash_text + $1e
lda #"2"
sta splash_year
sta splash_year+2
lda #"0"
sta splash_year+1
lda #"3"
sta splash_year+3
Atari5200AfterSplash
; splash screen delay. maybe add fire to speed up?
@ cpx RTCLOK+1
bne @-
.ENDIF
jsr MakeDarkScreen