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INTEL 186 EB/EC EVALUATION BOARD USER’S MANUAL
6-6
6.5.20 WRITE_WPORT (Code 19H)
This command stores the least-significant word of the RISM_DATA register in the 16-bit
output port pointed to by the RISM_ADDR register.
6.5.21 STEP (Code 1AH)
This command sets the target processor’s TRAP_FLAG and the RUN_FLAG and steps one
instruction. After setting these flags, the action of this command is similar to the
START_USER command followed by a TRAP.
6.5.22 READ_REG (Code 1BH)
This command reads the word value of a CPU register pointed to by the most-significant
word of the RISM_DATA register and places the result in the least-significant word of the
RISM_DATA register. Registers are accessed as shown in Table 6-2:
6.5.23 WRITE_REG (Code 1CH)
This command stores the least-significant word of the RISM_DATA register in the CPU register
pointed to by the most-significant word of the RISM_DATA register. Registers are accessed as
shown in Table 6-2.
Table 6-2. iRISM Registers
MSW of RISM_DATA Register
0000H SS
0001H ES
0002H DS
0003H DI
0004H SI
0005H BP
0006H SP
0007H BX
0008H DX
0009H CX
000AH AX
000BH IP
000CH CS
000DH FLAGS