Use vectors for irq and nmi

sw/bios/devices/interrupt.s

@@ -6,12 +6,11 @@
 ;
 ; Checks for a BRK instruction and returns from all valid interrupts.
 
-.import   _handle_irq
-.import _cputc, _clrscr
-
 .export   _irq_int, _nmi_int
 
-.include "io.inc65"
+
+IRQ_VECTOR = $220
+NMI_VECTOR = $222
 
 .segment  "CODE"
 
@@ -20,81 +19,9 @@
 ; ---------------------------------------------------------------------------
 ; Non-maskable interrupt (NMI) service routine
 
-_nmi_int:  RTI                    ; Return from all NMI interrupts
+_nmi_int:  jmp (NMI_VECTOR)
 
 ; ---------------------------------------------------------------------------
 ; Maskable interrupt (IRQ) service routine
 
-_irq_int:  PHX                    ; Save X register contents to stack
-           TSX                    ; Transfer stack pointer to X
-           PHA                    ; Save accumulator contents to stack
-           INX                    ; Increment X so it points to the status
-           INX                    ;   register value saved on the stack
-           LDA $100,X             ; Load status register contents
-           AND #$10               ; Isolate B status bit
-           BNE break              ; If B = 1, BRK detected
-
-; ---------------------------------------------------------------------------
-; IRQ detected, return
-
-irq:       PLA                    ; Restore accumulator contents
-           PLX                    ; Restore X register contents
-           jsr _handle_irq        ; Handle the IRQ
-           RTI                    ; Return from all IRQ interrupts
-
-; ---------------------------------------------------------------------------
-; BRK detected, stop
-
-break:
-        pla
-        plx
-        jmp (bios_table,x)
-
-
-bios_table:
-        .addr   _console_clear
-        .addr   _console_read_char
-        .addr   _console_write_char
-
-
-_console_clear:
-        jsr _clrscr
-        rti
-
-_console_read_char:
-        ; not supported
-        rti
-
-_console_write_char:
-        jsr _cputc
-        rti
-
-
-
-; What functions do we need?
-; UART
-;   clear
-;   write character
-;   read character
-; DISK
-;   init (or should it just init on boot?)
-;   read sector into memory
-; FS
-;   init (if disk init succeeds, should it always try?)
-;   find add
-
-; I think that is all we need for now?
-; How do we call the functions?
-
-; we have to call `brk` to trigger the interrupt
-; in any of the three registers we can have arguments
-; or we could have them pushed to the stack, assuming
-; the stack is in the same location
-; Or you could pass a pointer which points to an array
-; of arguments
-
-; for things like clear, read/write character, and init you don't
-; need any arguments.
-
-; jump table index needs to be in x, but also needs to be a multiple
-; of 2.
+_irq_int:  jmp (IRQ_VECTOR)

sw/bios/irq.c

@@ -1,11 +0,0 @@
-
-#include <stdint.h>
-#include <conio.h>
-
-#include "devices/interrupt.h"
-#include "devices/uart.h"
-
-
-
-void handle_irq() {
-}