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Lots of changes! Takes us to rom S
[uccvend-snackrom.git]
/
ROM2
/
start.s
diff --git
a/ROM2/start.s
b/ROM2/start.s
index
15ce855
..
c3f8d36
100644
(file)
--- a/
ROM2/start.s
+++ b/
ROM2/start.s
@@
-2,6
+2,14
@@
.globl _start
_start:
.globl _start
_start:
+ ;; set port a to output
+ ldab #0xfc ; 11111000
+ stab 0x1001
+
+ ;; start chiming
+ ldx #0x1000
+ bset 00,x #0x10
+
;; enable the RTI
ldaa #0x40
staa 0x1024
;; enable the RTI
ldaa #0x40
staa 0x1024
@@
-19,18
+27,22
@@
_start:
staa 0x1030
;; set the stack pointer
staa 0x1030
;; set the stack pointer
- lds _stack
+ lds
#
_stack
;; blank initialised variables - should match memory.x's page0
ldx #0x0000
loop1:
;; blank initialised variables - should match memory.x's page0
ldx #0x0000
loop1:
- cpx #0x0
08
0
+ cpx #0x0
10
0
bcc out1
clr 00,x
inx
bra loop1
out1:
bcc out1
clr 00,x
inx
bra loop1
out1:
+ ;; stop chiming
+ ldx #0x1000
+ bclr 00,x #0x10
+
jsr main
infinity:
jsr main
infinity:
UCC
git Repository :: git.ucc.asn.au