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ootw: loader can now load all from c1-c15 plus intro/ending

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This commit is contained in:
Vince Weaver 2020-01-26 14:00:05 -05:00
parent 24bdaf795d
commit 615e6cf36b
2 changed files with 70 additions and 39 deletions
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2
ootw/Makefile
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@ -276,7 +276,7 @@ loader2.o: loader2.s
TITLE: title.o
ld65 -o TITLE title.o -C ../linker_scripts/apple2_d00.inc
title.o: title.s
title.o: title.s loader.s
ca65 -o title.o title.s -l title.lst

107
ootw/loader.s
View File

@ -1,7 +1,11 @@
; Loader for OOTW
; the BASIC program sets $05 with which thing to load
; Used to be standalone, now loaded as part of TITLE
; But still loads at $1400
; the TITLE program sets $05 with which thing to load
; this part of the program stays resident, so when a level ends
; it changes $05 (WHICH_LOAD) and this code loads the proper executable
nibtbl = $300 ; nothing uses the bottom 128 bytes of $300, do they?
bit2tbl = $380 ; bit2tbl: .res 86 ; = nibtbl+128
@ -10,7 +14,7 @@ filbuf = $3D6 ; filbuf: .res 4 ; = bit2tbl+86
; read any file slot 6 version
; based on FASTLD6 and RTS copyright (c) Peter Ferrie 2011-2013,2018
; modified to assembled with ca64 -- vmw
; modified to assembled with ca65 -- vmw
; added code to patch it to run from current disk slot -- vmw
@ -38,21 +42,74 @@ filbuf = $3D6 ; filbuf: .res 4 ; = bit2tbl+86
; process
; note also, can't load file bigger than $8000 (32k) in size?
; seems to break things?
;===================================================
;===================================================
; START / INIT
;===================================================
;===================================================
start:
jsr init ; unhook DOS, init nibble table
;======================
;===================================================
;===================================================
; SETUP THE FILENAME
;===================================================
;===================================================
which_load_loop:
ldy WHICH_LOAD
lda filenames_low,Y
ldx WHICH_LOAD
beq load_intro
cpx #16
beq load_ending
lda #<ootw_filename
sta OUTL
lda filenames_high,Y
lda #>ootw_filename
sta OUTH
ldy #6
cpx #10
bcc load_less_than_10 ; blt
txa
sec
sbc #10
tax
lda #'1' ; assume it's 10-15
sta (OUTL),Y
iny
load_less_than_10:
txa
clc
adc #48
sta (OUTL),Y
iny
lda #0
sta (OUTL),Y ; be sure NUL terminated
; might be issue if load >10 level
; then back to lower? that possible?
jmp opendir_filename
load_intro:
lda #<intro_filename
sta OUTL
lda #>intro_filename
sta OUTH
bne opendir_filename ; branch always
load_ending:
lda #<ending_filename
sta OUTL
lda #>ending_filename
sta OUTH
; fallthrough
opendir_filename:
; clear out the filename with $A0 (space)
@ -93,40 +150,14 @@ filename:
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
.byte $A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0,$A0
filenames_low:
.byte <intro_filename
.byte <ootw_c1_filename
.byte <ootw_c2_filename
.byte <ootw_c3_filename
.byte <ootw_c4_filename
.byte <ootw_c5_filename
filenames_high:
.byte >intro_filename
.byte >ootw_c1_filename
.byte >ootw_c2_filename
.byte >ootw_c3_filename
.byte >ootw_c4_filename
.byte >ootw_c5_filename
intro_filename:
.byte "INTRO",0
ootw_c1_filename:
.byte "OOTW_C1",0
ootw_c2_filename:
.byte "OOTW_C2",0
ootw_c3_filename:
.byte "OOTW_C3",0
ootw_c4_filename:
.byte "OOTW_C4",0
ootw_c5_filename:
.byte "OOTW_C5",0
ending_filename:
.byte "ENDING",0
ootw_filename:
.byte "OOTW_C",0,0,0
;unhook DOS and build nibble table