User`s manual

.DSKRD .DSKWR

5-14

.DSKRD

.DSKWR

Name

.DSKRD - Disk read routine

.DSKWR - Disk write routine

Codes

$0010

$0011

Description

These routines are used to read and write blocks of data from/to the

speciÞed disk or tape device. Information about the data transfer is

passed in a command packet which has been built somewhere in

memory. (The user program must Þrst manually prepare the

packet.) The address of the packet is passed as an argument to the

routine. The same command packet format is used for .DSKRD and

.DSKWR. It is eight half-words in length and is arranged as follows:

FEDCBA9876543210

$00 Controller LUN Device LUN

$02 Status Half-Word

$04

Memory Address

Most SigniÞcant Half-Word

$06 Least SigniÞcant Half-Word

$08 Block Number (Disk) Most SigniÞcant Half-Word

$0A File Number (Tape) Least SigniÞcant Half-Word

$0C Number of Blocks

$0E Flag Byte Address ModiÞer