IBM 2193 - Manual (Page 175)

Specification tables A-7
DMA channel assignments
This table shows the channel assignments for Direct Memory Access (DMA). DMA
allows I/O devices to transfer data directly to and from memory. You may need to
select an available DMA channel if you add an I/O device that uses DMA.
Table 5: DMA channel assignments
DMA channel Assignment
0 Available
1 Audio
2 Floppy Diskette
3 Printer Port
4 Cascade
5 Available
6 Available
7 Available