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megademo: auto-detect Apple II vs IIe and patch accordingly

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This commit is contained in:
Vince Weaver 2018-09-29 21:57:22 -04:00
parent 23de53dc81
commit 0752063d44
3 changed files with 25 additions and 6 deletions
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2
megademo/c64_opener.s
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@ -71,7 +71,7 @@ loopcoB:dex ; 2
bne loopcoA ; 2nt/3
beq c64_split
.align $100
;.align $100
;================================================

15
megademo/check_email.s
View File

@ -124,7 +124,9 @@ celoopB:dex ; 2
; Total of 17030 cycles to get back to where was
; For this part we want
; For this part we want on Apple II/II+
; On Apple IIe and newer want T 000/11111
; because the font is shifted upwards a line
; T00000000000000000000 G0000000000000000000000
; T00000000000000000000 G0000000000000000000000
@ -161,7 +163,10 @@ em_outer_loop:
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
;== line3
bit PAGE1 ; 4
ce_patch:
bit PAGE1 ;IIe ; 4
; bit PAGE0 ;II/II+ ; 4
lda #$55 ; 2
sta draw_line_p1+1 ; 4
jsr draw_line_1 ; 6
@ -183,7 +188,7 @@ em_outer_loop:
jsr draw_line_1 ; 6
;== line7
bit PAGE0 ; 4
bit PAGE1 ; 4
lda #$55 ; 2
sta draw_line_p2+1 ; 4
jsr draw_line_2 ; 6
@ -332,8 +337,8 @@ em_letters:
.byte 8,3, " A SAS LA KS",128
.byte 8+128,3,"FEYSESEHEEKS",128
.byte 9,3, "EI L",$22,"SE .",128
.byte 9+128,3,"EIHLOSEH.",128
.byte 9,3, "A !",$22,"SA .",128
.byte 9+128,3,"EYHIOSEH.",128
.byte 12,4, " /I",128
.byte 12+128,4," /Y",128

14
megademo/megademo.s
View File

@ -6,6 +6,20 @@
.include "hardware.inc"
;===================
; Check for Apple II and patch
;===================
lda $FBB3 ; IIe and newer is $06
cmp #6
beq apple_iie
lda #$54 ; patch the check_email font code
sta ce_patch+1
apple_iie:
;===================
; set graphics mode
;===================