Changeset 47 for trunk/page00/util.asm

Timestamp:

10/10/09 03:20:47 (3 years ago)

Author:

brandonlw

Message:

I'm reaching a point where I really need to be adding oncalc debugging tools, so I guess I'll start working on the system monitor and a basic menu system, rebuilding the APPS and PRGM menus to start with.
From there I can get a Calcsys-style hex editor in there and oncalc usb8x/USBTools-style logging.
Heck, maybe I can even transfer Calcsys TO it and execute at least part of it.
It's a lot of work and kind of off-track, but it's the only way I'm going to diagnose the dual booting and linking problems.

Files:

• trunk/page00/util.asm (modified) (2 diffs)

trunk/page00/util.asm

@@ -3 +3 @@
 
  PUBLIC _APP_PUSH_ERRORH,_APP_POP_ERRORH,FindSym,PushRealO1,Mov9ToOP1,FPAdd,OP1ToOP2,LCDDelay
- PUBLIC CopyFlashPage
+ PUBLIC CopyFlashPage,ATimes16,CalculateOSChecksum
  PUBLIC Placeholder005Fh,Placeholder0006h,Placeholder004Eh,Placeholder0003h,Placeholder0035h
  PUBLIC outputPage,NZIf83Plus,ZIfSlowSpeed,GetBytePaged,MakeOffPageCall,CopyToRAMPage
- PUBLIC CopyRAMToFlashPage,CanAlphIns,CanAlph,ResAlph,GetHexA,GetHexHL,SetFastSpeed
+ PUBLIC CopyRAMToFlashPage,CanAlphIns,CanAlph,ResAlph,GetHexA,GetHexHL,SetFastSpeed,cphlde
  PUBLIC BCALL,BJUMP,JErrorNo,SetupPagedPtr,PagedGet,EraseRAMPage,SetContrast,MemClear
  EXTERN Page0Call,UpdateAPD,PowerOff,GetCSC,PutC,DispHexHL,PutMap,BCALLRoutine,OS2Marker
@@ -22 +22 @@
 Placeholder004Eh:
 Placeholder005Fh:
+       ret
+
+cphlde:
+       push hl
+       or a
+       sbc hl,de
+       pop hl
+       ret
+
+ATimes16:
+       add a,a
+       add a,a
+       add a,a
+       add a,a
+       ret
+
+CalculateOSChecksum:
+       push ix
+       ld ix,userMem
+       ld bc,0FE70h-userMem
+       ld hl,0011h
+       ld d,h
+$$:    ld e,(ix+0)
+       inc ix
+       add hl,de
+       dec bc
+       ld a,b
+       or c
+       jr nz,$B
+       ld e,d
+       ex de,hl
+       sbc hl,de
+       pop ix
        ret