LINE0=HI_DRIVE, LINE9=HI_DRIVE, LINE13=HI_DRIVE, LINE11=HI_DRIVE, LINE4=HI_DRIVE, LINE2=HI_DRIVE, LINE1=HI_DRIVE, LINE5=HI_DRIVE, LINE7=HI_DRIVE, LINE15=HI_DRIVE, LINE10=HI_DRIVE, LINE8=HI_DRIVE, LINE6=HI_DRIVE, LINE3=HI_DRIVE, LINE14=HI_DRIVE, LINE12=HI_DRIVE
I/O Drive Register 1
| LINE0 | Drive of PIO line 0 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE1 | Drive of PIO line 1 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE2 | Drive of PIO line 2 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE3 | Drive of PIO line 3 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE4 | Drive of PIO line 4 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE5 | Drive of PIO line 5 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE6 | Drive of PIO line 6 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE7 | Drive of PIO line 7 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE8 | Drive of PIO line 8 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE9 | Drive of PIO line 9 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE10 | Drive of PIO line 10 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE11 | Drive of PIO line 11 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE12 | Drive of PIO line 12 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE13 | Drive of PIO line 13 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE14 | Drive of PIO line 14 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |
| LINE15 | Drive of PIO line 15 0 (HI_DRIVE): High drive 1 (ME_DRIVE): Medium drive 2 (LO_DRIVE): Low drive |