address
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... character VDUs are commonly used to display text. This
activity requires bit-map displays, with an address in
memory for each postion on the screen. Full colour and
multiple shades can be used with appropriately large
...
... each device when the system is built up. A DCT can be
defined anywhere as devices are referenced by the DCT
address. The macro 'setdcte' is designed to declare
devices, the meanings of its parameters being specified
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...
Each block is actually two blocks on the disk: an adddress
ID block and the data block. The address ID block is used
by the hardware and contains the track number, the block
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... number and the size of the data block that follows. When an
operation is to take place, the seek mechanism first locates
the block by reading the address ID blocks and literally
'hunting' for the correct one. It will hunt for up to 2
seconds before reporting a failure.
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... seconds before reporting a failure.
Both the address ID and the data blocks are followed by a
checksum word that is maintained by the hardware ...
...
This specifies the data adress, which must be even
(word boundary). If an odd address is given, the low
order bit is set to zero ...
... #define SPD 0120000 /* Select Special Device */
#define LPA 0130000 /* Load Peripheral Address */
#define LPR 0140000 /* Load Peripheral Register */
...