conio and most other stuff working now

libsrc/gamate/crt0.s

@@ -1,16 +1,78 @@
 
         .export         __STARTUP__ : absolute = 1      ; Mark as startup
 
-        .import reset, irq, nmi ; FIXME
+        .import         initlib, donelib, callmain
+        .import         push0, _main, zerobss, copydata
 
+        .import         IRQStub
+
+        ; Linker generated symbols
+        .import         __RAM_START__, __RAM_SIZE__
+        .import         __ROM_START__, __ROM_SIZE__
+        .import         __STARTUP_LOAD__,__STARTUP_RUN__, __STARTUP_SIZE__
+        .import         __CODE_LOAD__,__CODE_RUN__, __CODE_SIZE__
+        .import         __RODATA_LOAD__,__RODATA_RUN__, __RODATA_SIZE__
+
+        .include        "zeropage.inc"
+        .include        "gamate.inc"
 
         .segment "STARTUP"
 
-checksum:
-        .word 0
-        .byte 1, 0, 1
-        .byte "COPYRIGHT BIT CORPORATION", 0, $ff
-        jmp     reset
-        jmp     nmi
-        jmp     irq
+        .word 0                                         ; +00 checksum from 7000-7fff (simple 8bit adds)
+        .byte 1, 0, 1                                   ; +02 flags
+        .byte "COPYRIGHT BIT CORPORATION", 0, $ff       ; +05 copyright
+        ; system vectors
+        jmp     reset                                   ; +20 reset entry
+        jmp     nmi                                     ; +23 nmi entry
+        jmp     IRQStub                                 ; +26 irq entry (135 hz)
 
+;-------------------------------------------------------------------------------
+reset:
+        ; setup the CPU and System-IRQ
+
+        ; Initialize CPU
+        sei
+        cld
+
+        ; Setup stack and memory mapping
+        ldx     #$FF            ; Stack top ($01FF)
+        txs
+
+        ; Clear the BSS data
+        jsr     zerobss
+
+        ; Copy the .data segment to RAM
+        jsr     copydata
+
+        ; setup the stack
+        lda     #<(__RAM_START__+__RAM_SIZE__)
+        sta     sp
+        lda     #>(__RAM_START__+__RAM_SIZE__)
+        sta     sp + 1
+
+        ; Call module constructors
+        jsr     initlib
+
+        cli     ; allow IRQ only after constructors have run
+
+        ; Pass an empty command line
+        jsr     push0           ; argc
+        jsr     push0           ; argv
+
+        ldy     #4              ; Argument size
+        jsr     _main           ; call the users code
+
+        ; Call module destructors. This is also the _exit entry.
+_exit:
+        jsr     donelib         ; Run module destructors
+
+        ; reset (start over)
+        jmp     reset
+
+        .export initmainargs
+initmainargs:
+        rts
+
+;-------------------------------------------------------------------------------
+nmi:
+        rts