Reference Manual

Turbo PMAC/PMAC2 Software Reference

Turbo PMAC On-line Command Specification 312

extended data memory configuration. (Starting with V1.937 firmware, a Turbo PMAC with the extended

data memory configuration will at re-initialization have a UBUFFER of 65,536 words defined, causing

this register to hold a value of $030000.) Immediately after the user buffer has successfully been defined,

this register will hold the address of the start of the buffer (the end of the user buffer is always at the end

of data memory).

To free up this memory for other uses, the DEFINE UBUFFER 0 command should be used (there is no

DELETE UBUFFER command). It may be more convenient simply to re-initialize the board with a

$$$*** command.

Example:

RHX:$0031B2 ; Look for end of unreserved memory

00FC99 ; Reply indicates some reserved

$$$*** ; Re-initialize card to clear memory

RHX:$0031B2 ; Check end of unreserved memory

010800 ; Reply indicates none reserved

DEFINE UBUFFER 2048 ; Reserve memory for buffer

RHX:$0031B2 ; Check for beginning of buffer

010000 ; Reply confirms 2048 words reserved

M1000->D:$010000 ; Define M-variable to first word

M1010->Y:$010020,12,1 ; Define M-variable to a middle word

M1023->X:$0107FF,24,S ; Define M-variable to last word