interrupt cleanup started

Makefile

@@ -3,7 +3,7 @@
 
 SRC_COMMON            = $(wildcard c64/aliases/*.s)
 SRC_BASIC_COMMON      = $(SRC_COMMON) $(wildcard c64/basic/*.s)
-SRC_KERNAL_COMMON     = $(SRC_COMMON) $(wildcard c64/kernal/*.s c64/kernal/jumptable/*.s c64/kernal/iec/*.s)
+SRC_KERNAL_COMMON     = $(SRC_COMMON) $(wildcard c64/kernal/*.s c64/kernal/jumptable/*.s c64/kernal/iec/*.s c64/kernal/interrupts/*.s)
 
 SRC_BASIC_generic     = $(SRC_BASIC_COMMON) $(wildcard c64/basic/,target_generic/*.s)
 SRC_BASIC_mega65      = $(SRC_BASIC_COMMON) $(wildcard c64/basic/,target_mega65/*.s)

STATUS.md

@@ -25,7 +25,7 @@ The following ROM features are currently missing:
 * floating point routines
 * tape support
 * RS-232 support
-* warm start (RUN/STOP + RESTORE) - NMI is not implemented at all
+* warm start (RUN/STOP + RESTORE) - NMI/BRK handling is not implemented at all
 * breaking Kernal routines with RUN/STOP key
 
 Features currently being worked on:
@@ -73,7 +73,7 @@ NOTE: Even the 'DONE' routines won't support features described as missing in on
 | `$FF81`   | `CINT`   | PARTIAL  | at least PAL/NTSC detection is missing             |
 | `$FF84`   | `IOINIT` | PARTIAL  | at least SID volume handling is missing            |
 | `$FF87`   | `RAMTAS` | DONE     |                                                    |
-| `$FF8A`   | `RESTOR` | PARTIAL  | CBINV, NMINV, and USRCMD missing                   |
+| `$FF8A`   | `RESTOR` | DONE     |                                                    |
 | `$FF8D`   | `VECTOR` | DONE     |                                                    |
 | `$FF90`   | `SETMSG` | DONE     |                                                    |
 | `$FF93`   | `SECOND` | DONE     |                                                    |

c64/kernal/chkinout_real.s

@@ -11,7 +11,7 @@
 
 ;; CHKIN implementation
 
-chkin:
+chkin_real:
 
 	;; Store Y for preservation
 	tya
@@ -88,11 +88,9 @@ chkinout_file_not_output:
 	tay
 	jmp kernalerror_FILE_NOT_OUTPUT
 
-chkinout_common:
-
 ;; CKOUT implementation
 
-ckout:
+ckout_real:
 
 	;; Store Y for preservation
 	tya

c64/kernal/f20e.chkin.jmp.s

@@ -0,0 +1,6 @@
+
+;; In our implementation CHKIN and CKOUT are closely tied,
+;; placing it here would cause a collision
+
+chkin:
+    jmp chkin_real

c64/kernal/f250.ckout.jmp.s

@@ -0,0 +1,6 @@
+
+;; In our implementation CHKIN and CKOUT are closely tied,
+;; placing it here would cause a collision
+
+ckout:
+    jmp ckout_real

c64/kernal/interrupts/fe47.default_nmi_handler.s

@@ -0,0 +1,8 @@
+
+default_nmi_handler:
+
+	;; XXX provide real implementation
+
+	inc $D020
+	rti
+

c64/kernal/interrupts/fe66.default_brk_handler.s

@@ -0,0 +1,6 @@
+default_brk_handler:
+
+	;; XXX implement this!
+
+	;; Acknowledge CIA interrupt and return
+	jmp clear_cia1_interrupt_flag_and_return_from_interrupt

c64/kernal/interrupts/nmi_handler.s

@@ -0,0 +1,5 @@
+
+nmi_handler:
+
+	jmp (NMINV)
+

c64/kernal/nmi_handler.s

@@ -1,3 +0,0 @@
-nmi_handler:
-	inc $D020
-	rti

c64/kernal/vector_defaults.s

@@ -8,19 +8,19 @@
 
 vector_defaults:
 	.word default_irq_handler    ;; CINV
-	.word $0000                  ;; CBINV    XXX implement this, has to be $FE66 for autostart support
-	.word $0000                  ;; NMINV    XXX implement this, has to be $FE47 for autostart support
+	.word default_brk_handler    ;; CBINV
+	.word default_nmi_handler    ;; NMINV
 
-	.word open     ;; IOPEN
-	.word close    ;; ICLOSE
-	.word chkin    ;; ICHKIN   XXX move routine to $F20E - for autostart support
-	.word ckout    ;; ICKOUT   XXX move routine to $F250 - for autostart support
-	.word clrchn   ;; ICLRCH
-	.word chrin    ;; IBASIN
-	.word chrout   ;; IBSOUT
-	.word stop     ;; ISTOP
-	.word getin    ;; IGETIN
-	.word clall    ;; ICLALL
-	.word $0000    ;; USRCMD   XXX implement this, has to be $FE66 for autostart support
-	.word load     ;; ILOAD 
-	.word save     ;; ISAVE
+	.word open                   ;; IOPEN
+	.word close                  ;; ICLOSE
+	.word chkin                  ;; ICHKIN
+	.word ckout                  ;; ICKOUT
+	.word clrchn                 ;; ICLRCH
+	.word chrin                  ;; IBASIN
+	.word chrout                 ;; IBSOUT
+	.word stop                   ;; ISTOP
+	.word getin                  ;; IGETIN
+	.word clall                  ;; ICLALL
+	.word default_brk_handler    ;; USRCMD
+	.word load                   ;; ILOAD 
+	.word save                   ;; ISAVE