Apple-2-SW/dos33fsprogs
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ds: update ansi

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This commit is contained in:
Vince Weaver 2019-09-04 00:05:11 -04:00
parent 2fd77eb9db
commit 6c3c5676f7
2 changed files with 5 additions and 5 deletions
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demosplash/appleII_ansi.png
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10
demosplash/pt3_setup.s
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@ -111,7 +111,7 @@ mockingboard_found:
sta $03ff
;============================
; Enable 50Hz clock on 6522
; Enable 60Hz clock on 6522
;============================
sei ; disable interrupts just in case
@ -125,15 +125,15 @@ mockingboard_found:
sta $C40D ; IFR: 1100, enable interrupt on timer one oflow
sta $C40E ; IER: 1100, enable timer one interrupt
lda #$E7
lda #$1b
sta $C404 ; write into low-order latch
lda #$4f
lda #$41
sta $C405 ; write into high-order latch,
; load both values into counter
; clear interrupt and start counting
; 4fe7 / 1e6 = .020s, 50Hz
; 411b / 1e6 = .0166s, 60Hz
;==================
; init song
@ -143,7 +143,7 @@ mockingboard_found:
rts
;==============================-=========
;========================================
;========================================
; Helper routines below