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Interruptor support

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3492 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
2005-04-27 18:01:57 +00:00
parent cbdcab4fdb
commit 066b07c6ce
1 changed files with 97 additions and 90 deletions
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11
libsrc/apple2/crt0.s
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@@ -161,11 +161,12 @@ msglen = * - errmsg
.segment "LOWCODE" .segment "LOWCODE"
; ProDOS TechRefMan, chapter 6.2: ; ProDOS TechRefMan, chapter 6.2:
; "Each installed routine must begin with a CLD instruction" ; "Each installed routine must begin with a CLD instruction."
intrpt: cld intrpt: cld
; Call interruptors ; Call interruptors and check for success
jsr callirq jsr callirq
bcc :+
; ProDOS TechRefMan, chapter 6.2: ; ProDOS TechRefMan, chapter 6.2:
; "When the routine that can process the interrupt is called, it ; "When the routine that can process the interrupt is called, it
@@ -173,6 +174,12 @@ intrpt: cld
clc clc
rts rts
; ProDOS TechRefMan, chapter 6.2:
; "When a routine that cannot process the interrupt is called,
; it should return (via an RTS) with the cary flag set ..."
: sec
rts
; ------------------------------------------------------------------------ ; ------------------------------------------------------------------------
.code .code