chris/open-roms
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fix some bugs

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This commit is contained in:
Paul Gardner-Stephen committed 2019-04-19 21:03:53 +09:30
1 parent 85d6c10832
commit aab7b98c27
2 files changed
+5 -7
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c64/kernal/chrout.s
+1 -4
View File
@@ -1,9 +1,6 @@
; Function defined on pp272-273 of C64 Programmers Reference Guide ; Function defined on pp272-273 of C64 Programmers Reference Guide
chrout: chrout:
;; Crude implementation of character output ;; Crude implementation of character output
sta $0400
inc $0401
jmp chrout
;; Write character on the screen ;; Write character on the screen
ldy current_screen_x ldy current_screen_x
@@ -13,7 +10,7 @@ chrout:
;; to insert a 2nd line in this logical line. ;; to insert a 2nd line in this logical line.
;; (eg Compute's Mapping the 64 p41) ;; (eg Compute's Mapping the 64 p41)
ldx current_screen_y ldx current_screen_y
iny current_screen_x iny
sty current_screen_x sty current_screen_x
cpy #40 cpy #40
beq screen_grow_logical_line beq screen_grow_logical_line
c64/kernal/set_pointer_to_current_screen_line.s
+4 -3
View File
@@ -15,12 +15,13 @@ set_pointer_to_current_screen_line:
sptcsl_l2: sptcsl_l2:
;; XXX - Should we read the columns per line from ;; XXX - Should we read the columns per line from
;; somewhere? ;; somewhere?
lda #<40 ldy #<40
;; Double line length if line is linked ;; Double line length if line is linked
bit screen_line_link_table,x lda screen_line_link_table,x
bpl sptcsl_l1 bpl sptcsl_l1
asl ldy #<80
sptcsl_l1: sptcsl_l1:
tya
clc clc
adc current_screen_line_ptr+0 adc current_screen_line_ptr+0
lda current_screen_line_ptr+1 lda current_screen_line_ptr+1