Bit 1, DSKBLK, indicates "disk block finished." It is used to indicate that the specified disk
DMA task that you have requested has been completed. This bit generates a level 1
interrupt.
More information about disk data transfer and interrupts may be found in Chapter 8,
"Interface Hardware."
SERIAL PORT INTERRUPTS
The following serial interrupts are associated with the specified bits of the interrupt
registers.
Bit 11, RBF (for receive buffer full), specifies that the input buffer of the UART has data
that is ready to read. This bit generates a level 5 interrupt.
Bit 0, TBE (for "transmit buffer empty"), specifies that the output buffer of the UART
needs more data and data can now be written into this buffer. This bit generates a level 1
interrupt.
Hardware Exec Software priority Label
priority Description
1 1 Software interrupt SOFTINT
2 Disk block complete DSKBLK
3 transmitter buffer empty TBE
2 4 external INT2 & CIAA PORTS
3 5 graphics coprocessor COPER
6 vertical blank interval VERTB
7 blitter finished BLIT
4 8 audio channel 2 AUD2
9 audio channel 0 AUD0
10 audio channel 3 AUD3
11 audio channel 1 AUD1
5 12 receiver buffer full RBF
13 disk sync pattern found DSKSYNC
6 14 external INT6 & CIAB EXTER
15 special (master enable) INTEN
7 -- non-maskable interrupt NMI
Figure 7-4: Interrupt Priorities
- 216 System Control Hardware -
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