Echo2SIOInt.asm

Language: 8080 Assembly
Last Modified: 2022-11-15 1:50:54 AM UTC
File Size: 1055 bytes

http://www.penguinstew.ca/example/AltairSerialEcho/Echo2SIOInt.asm

;Read2SIOstatusregister

ORG0000H

LXISP0100H;0000:310001Initalizestackpointer

MVIA03H;0003:3E03

OUT10H;0005:D310Rest2SIOport

MVIA95H;0007:3E95

OUT10H;0009:D310Set2SIOportto8n1enable2SIOinterupts

EI;000B:FBEnableCPUinterupts

LOOP:NOP;000C:00

NOP;000D:00

NOP;000E:00

JMPLOOP;000F:C30C00Programloop

ORG0038H;InteruptHandler

PUSHA;0038:F5SavevalueofaccumulatorandPSW

IN11H;0039:DB11

OUT11H;003B:D311Echovalue

POPA;003D:F1RestoreaccumulatorandPSW

EI;003E:FBRenableinterupts

RET;003F:C9return