b. User wants to add 128k EPROMs and 128k SRAMs to a PC using the 74138 to decode the 32k x8 memory blocks (EPROMs and SRAMS) controlled by Y Addresses available start 50000H and another D0000. 1. How many memory block required from EPROMs and SRAMS? 2. Determine the typical range address of added EPROMs and SRAMs? 3. Determine the range of each memory block controlled by Ys?

Introductory Circuit Analysis (13th Edition)
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ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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a.
.DATA
.CODE
VAL1 DW 19A7H
VAL2 DW 20C8H
VAL3 DW 1005H
REST DW 2 DUP (?)
MAIN PROC FAR
MOV AX, @DATA
MOV DS, AX
PUSH VAL3
PUSH VAL2
PUSH VAL1
CALL SUBR1
MOV RESL, AX
MOV REST +2, BX
MOV AH, 4CH
INT 21H
MAIN ENDP
END MAIN
SUBR1 PROC FAR
SUB BX, BX
PUSH BP
MOV BP, SP
MOV AX, [BP+6]
MOV CX, [BP +8]
MOV DX, [BP +10]
ADD AX,CX
ADC BX, 00
ADD AX, DX
ADC BX, 00
POP BP
RET 6
SUBR1 ENDP
END
Assume SP = 16C7H before the "PUSH VAL3" instruction in the main
procedure. After the main procedure is executed, find the following:
RESI =
SP=
b. User wants to add 128k EPROMs and 128k SRAMs to a PC using the 74138s
to decode the 32k x8 memory blocks (EPROMs and SRAMS) controlled by Ys.
Addresses available start 50000H and another D0000.
1. How many memory block required from EPROMs and SRAMS?
2. Determine the typical range address of added EPROMs and SRAMs?
3. Determine the range of each memory block controlled by Ys?
4. Design and draw the memory decoding using 74138 circuitries in which the
memory block controlled by Ys?
Transcribed Image Text:a. .DATA .CODE VAL1 DW 19A7H VAL2 DW 20C8H VAL3 DW 1005H REST DW 2 DUP (?) MAIN PROC FAR MOV AX, @DATA MOV DS, AX PUSH VAL3 PUSH VAL2 PUSH VAL1 CALL SUBR1 MOV RESL, AX MOV REST +2, BX MOV AH, 4CH INT 21H MAIN ENDP END MAIN SUBR1 PROC FAR SUB BX, BX PUSH BP MOV BP, SP MOV AX, [BP+6] MOV CX, [BP +8] MOV DX, [BP +10] ADD AX,CX ADC BX, 00 ADD AX, DX ADC BX, 00 POP BP RET 6 SUBR1 ENDP END Assume SP = 16C7H before the "PUSH VAL3" instruction in the main procedure. After the main procedure is executed, find the following: RESI = SP= b. User wants to add 128k EPROMs and 128k SRAMs to a PC using the 74138s to decode the 32k x8 memory blocks (EPROMs and SRAMS) controlled by Ys. Addresses available start 50000H and another D0000. 1. How many memory block required from EPROMs and SRAMS? 2. Determine the typical range address of added EPROMs and SRAMs? 3. Determine the range of each memory block controlled by Ys? 4. Design and draw the memory decoding using 74138 circuitries in which the memory block controlled by Ys?
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