BUFFER I/O Path Registers

All registers can be read with the STATUS command. The following registers can be set with the CONTROL command: 3, 4, 5, 8, and 9.

0 - ASSIGN status: 0 - not assigned, 3 - assigned to a buffer

1 - Buffer named flag: 1 - named, 2 - unnamed

2 - Buffer size in bytes

3 - Current fill pointer

4 - Current number of bytes in buffer

5 - Current empty pointer

6 - Interface select code for in-coming TRANSFER

7 - Interface select code for out-going TRANSFER

8 - Continuous in-coming TRANSFER flag: zero - not continuous, non-zero - continuous

9 - Continuous out-going TRANSFER flag: zero - not continuous, non-zero - continuous

10 - In-coming TRANSFER status

Bit	Value	Meaning
7	128	Always 0
6	64	Active
5	32	Aborted
4	16	Error
3	8	Device caused termination
2	4	Byte count caused termination
1	2	Record count caused termination
0	1	Match char caused termination
11	-	Out-going TRANSFER termination status. Same meaning as above
12	-	Count of bytes transferred by last in-coming TRANSFER
13	-	Count of bytes transferred by last out-going TRANSFER