List of SITS system calls

SITS system calls were done using EMT in older versions, and TRAP in newer. The system call number makes up the lower 7 bits. Bit 200 can be set to have the call fault on error, in which case a $ replaces the . in the symbolic name.

System call arguments go on the stack. (C) indicates a capability.

Number	Name	Function	Arguments
0	.NOOP	None	None
1	.FORK	Create new process	Entry point
2	.POOFF	Kill this process	None
3	.SLEEP	Sleep	Time	Time
4	.SINK	Disable floating point	None
5	.FLOAT	Enable floating point	None
6	.INVOK	Invoke capability	Capability (C)	argument	argument
7	.QULK	Lock queue	Queue (C)
10	.QUNLK	Unlock queue	Queue (C)
11	.TTGIV	Give TTY away	Master sphere (C)	Teletype (C)
12	.TTGET	Get the TTY	Teletype (C)
13	.WRDI	Word input
14	.WRDO	Word output
15	.BYTI	Byte input
16	.BYTO	Byte output
17	.BLKI	Block input
20	.BLKO	Block output
21	.MAP	Create page
22	.ALLOC	Allocate swap	Size	Start	Disk
23	.CRUSR	Make this a user process	Copy name	Length of name	Pointer to name
24	.RDMAP	Read map	Sphere (C)	Address
25	.FONT	Read or write font	Function,,font	Address
26	.SSTAT	Read system status	Address
27	.VIDSW	Set video switch modes	Source	Destination
30	.RUG	Hack system sphere(?)
31	.GERRW	Get error word
32	.TIME	Get or set time
33	.SYJB	Perform system job	None
34	.GETID	Get process id
35	.MFPI		Address
36	.OSPAC