Size - Indicate Whether 4K Or 16K Mpx-L Loadram - Load Mpx Local Ram From System Ram; Exram - Execute A Program In Local Ram - Lexicon MPX-1 Technical Manual

bus during system interrupt acknowledge cycles. The value is called the inter-
rupt response byte and may be set as desired with this command. Note that this
response will only appear on the bus if this feature in enabled by a hardware
switch. See the hardware section of this document for more information.
SIZE - INDICATE WHETHER 4K OR 16K MPX-l
OPCODE BIT CODING:
Bit 7
CONT
I
INT
o
o o
1 1
Bit 0
a
PARAMETERS PASSED: Link Address.
PARAMETERS RETURNED: Size indication.
DESCRIPTION: This command is used by the system to determine the aollount of
memory installed in this particular MPX-l. The Result I Byte is set to 00 hex
if this is a 4K MPX-I and is set to FFH if this is a 16K MPX-l.
LOADRAM - LOAD MPX LOCAL RAM FROM SYSTEM RAIl
OPCODE BIT CODING:
Bit 7
CaNT lINT
o o
o
1
1
Bit 0
1
PARAMETERS PASSED: Starting Address in System RAM (3 bytes)
Ending~Address in System RAM (3 bytes)
Destination Address in Local RAM (2 bytes)
Link Address
PARAMETERS RETURNED: None.
DESCRIPTION: This command is used to load the MPX local RAM from system RAM.
Three addresses are passed to the MPX: The starting address of the block to be
loaded, its ending address, and the starting address of the place to put it in
local RAM. The starting and ending addresses are 3 bytes long and the destina-
tion address is only two bytes long. All addresses are stored low byte first
and the starting address is at Parameter Bytes 0-2, the ending address is at
Parameter Bytes 3-5, and the destination address is at bytes 6-7.
EXRAH - EXECUTE A PIWGRAM IN LOCAL RAIl
OPCODE BIT CODING:
Bit 7
CaNT
I
INT
o a
17
1
o o
Bit 0
o