46 lines
1.1 KiB
Plaintext
46 lines
1.1 KiB
Plaintext
;license:MIT
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;(c) 2020 by qkumba
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;
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; Identify platform and construct appropriate VBL routine
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romid = $FBB3
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; $38=][, $EA=][+, $06=//e compatible
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ROMID_IIECOMPAT = 6
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romid_ec = $FBC0
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; $EA=//e original, $E0=//e enhanced, $E1=//e EDM, $00=//c
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; IIGS
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idroutine = $FE1F ; SEC, JSR $FE1F, BCS notgs
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InitVBL
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ldx romid
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cpx #ROMID_IIECOMPAT
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bne @build_none ; not a //e
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lda romid_ec
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beq @build_iic ; //c family
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sec
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jsr idroutine ; check for IIgs
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bcs @NotGS
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lda #$30
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sta patch_VBL_iigs1
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lda #$10
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sta patch_VBL_iigs2
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@NotGS
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rts
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@build_iic
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lda #$70
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sta patch_VBL_iic1+1
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lda #$60
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sta patch_VBL_iic2
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lda #<iWaitForVBL
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sta WaitForVBL+1
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lda #>iWaitForVBL
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sta WaitForVBL+2
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lda #$4C
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sta UnwaitForVBL
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rts
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@build_none
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lda #$60
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sta WaitForVBL
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rts
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