Alpaca OS Task system ram/rom usage cheat sheet
$Id: tasknotes.txt,v 1.2 2003/08/14 20:10:16 jerry Exp $
Jerry Lawrence

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RAM: Task Slot management

byte	taskFlag	one per OS
			bit0	slot0use    Task slot 0 in use if set
			bit1	slot1use    Task slot 1 in use if set
			bit2	slot2use    Task slot 2 in use if set
			bit3	slot3use    Task slot 3 in use if set
			bit4	TBD
			bit5	TBD
			bit6	TBD
			bit7	taskActive  Task switching is active

byte	slotCtrl[4]	one per slot
			bit7	C_InUse - task is running 
			bit6	TBD
			bit5	TBD

			bit4	C_EXT0	extended command 0:
				bit3	TBD
				bit2	sleepSlot  relinquish time
				bit1	execSlot   start task in IDX
				bit0	killSlot   stop the slot

byte	slotIdx[4]	one per slot
			contains the task number for that task

word	slotSP[4]	one per slot
			contains the SP for that task
			
byte	taskSlot	one per OS
			the currently active slot

word	ramBase		one per OS
			the base of RAM for the currently running task

byte	slotTime	one per OS
			the number of ticks the active slot has

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ROM: Constants

word	tasklist	array of words, pointers to headers
			+0  = task 0
			+2  = task 1
			...
	tasklist[0]+6 = pascal string of task 0 name
	tasklist[0]+8 = entry point for task 0


word	stacklist	array of stack boundaries
	.word	stack0		; +0
	.word	stack1		; +2
	.word	stack2		; +4
	.word	stack3		; +6
	.word	stackbottom	; +8

	ramBase for a task is the stacklist entry after the current item

byte	ticksper	number of starting ticks per slot