58675



58675 ($E533); CLOSE command routines.

58702 ($E54E); STATUS and special command routines.

58729 ($E569) CIREAD; process the CIO commands for read and
write, including buffer check for full or empty.

58907 ($E61B); routine to return to the user from CIO.

58941 ($E63D), routines to compute the device handler entry point,
jump to the handler, transfer control, and then return to CIO after the
operation.

59093-59715    E6D5-E943      INTORG
Addresses for the interrupt handler routines:

59123 ($E6F3) PIRQ; IRQ interrupt service routines start here.

59126 ($E6F6); the immediate IRQ vector to the IRQ handler. The
global NMI and IRQ RAM vectors in locations 512 to 527 ($200 to $20F)
are all initialized to this area (59142, $E706 for the new OS ROMs).

59314 ($E7B2); the vector for the IRQ interrupts on powerup; it
points to a PLA and RTI instruction sequence (new OS ROMs; 59219;
$E78F).

59316 ($E7B4) PNMI; the NMI handler, tests for the reason for the
NMI, then jumps through the appropriate RAM vector. Also called the
Interrupt Service Routine (ISR).

59345 ($E7D1) SYSVBL; the VBLANK routines start here,
including frame counter, update timer, update hardware registers
from shadow registers, update the attract mode counter and the
realtime clock. The vertical blank immediate vector, VVBLKL1,
normally pointed to by locations 546, 547 ($222, $223), points to here.
The Updated OS ROMs point to 59310 ($E7AE).

59666 ($E912) SETVBL; subroutines to set the VBLANK timers
and vectors.

The vertical blank deferred interrupt, normally vectored from
locations 548, 549 ($224, $225), points to 59710 ($E93E). In the
Updated OS ROMs, it points to 59653 ($E905). In both cases they point
to the VBLANK exit routine.

See page 104 of the OS User's Manual for a list of the vectors and
MICRO, January 1982, for an explanation of the VBLANK process.

59716-60905    E944-EDE9      SIOORG
Routines for the Serial Input/Output (SIO) routines:

60011 ($EA6B) SEND; is the SIO send buffer routine entry.

60048 ($EA90) ISRODN, is the serial output ready IRQ vector.