/* initialize the memory control register by setting bits 2 - 0 to ’0’*/

sprintf(command, "DIAG:PEEK? %ld, %d", base_addr+0x21,8); IOOUTPUTS(CMD_MOD, command, strlen(command)); IOENTER(CMD_MOD, &bit_pat);

/* retain register settings, set memory control register bits 2 - 0 */ /* to ’0’ */

bit_reg = (int)(bit_pat + ((bit_pat >= 0) ? .5 : -.5)); bit_reg = (bit_reg & 0xF8);

sprintf(command, "DIAG:POKE %ld, %d, %d", base_addr+0x21,8,bit_reg); IOOUTPUTS(CMD_MOD, command, strlen(command));

/* write the terminal (ending) address to the terminal address register */

sprintf(command, "DIAG:POKE %ld, %d, %d", base_addr+0x2B,8,255); IOOUTPUTS(CMD_MOD, command, strlen(command));

/* set the base (starting) address - most significant byte */

sprintf(command, "DIAG:POKE %ld, %d, %d", base_addr+0x2D,8,255); IOOUTPUTS(CMD_MOD, command, strlen(command));

/* set the base (starting) address - least significant byte */

sprintf(command, "DIAG:POKE %ld, %d, %d", base_addr+0x2F,8,251); IOOUTPUTS(CMD_MOD, command, strlen(command));

/* enable memory to be written to and enable the address counter */ /* by setting bits 2 - 0 to ’1 0 1’. */

sprintf(command, "DIAG:PEEK? %ld, %d", base_addr+0x21,8); IOOUTPUTS(CMD_MOD, command, strlen(command)); IOENTER(CMD_MOD, &bit_pat);

/* retain register settings, set memory control register bits 2 and 0 */ /* to ’1’ */

bit_reg = (int)(bit_pat + ((bit_pat >= 0) ? .5 : -.5)); bit_reg = (bit_reg & 0xF8) 0x05;

sprintf(command, "DIAG:POKE %ld, %d, %d", base_addr+0x21,8,bit_reg); IOOUTPUTS(CMD_MOD, command, strlen(command));

}

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Appendix C

Register Programming 395

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