Eor

FA70: 29 1F	395		AND	#$1F
FA72: 49 14	396		EOR	#$14
FA74: C9 04	397		CMP	#$04	;COPY USER INST TO XEQ AREA
FA76: F0 02	398		BEQ	XQ2	;	WITH TRAILING NOPS
FA78: B1 3A	399	XQ1	LDA	(PCL),Y	;CHANGE REL BRANCH
FA7A: 99 3C 00	400	XQ2	STA	XQT,Y	;	DISP TO 4 FOR
FA7D: 88	401		DEY		;	JMP TO BRANCH OR
FA7E: 10 F8	402		BPL	XQ1	;	NBRANCH FROM XEQ.
FA80: 20 3F FF	403		JSR	RESTORE	;RESTORE USER REG CONTENTS.
FA83: 4C 3C 00	404		JMP	XQT	;XEQ USER OP FROM RAM
FA86: 85 45	405	IRQ	STA	ACC	;	(RETURN TO NBRANCH)
FA88: 68	406		PLA
FA89: 48	407		PHA		;**IRQ HANDLER
FA8A: 0A	408		ASL
FA8B: 0A	409		ASL
FA8C: 0A	410		ASL
FA8D: 30 03	411		BMI	BREAK	;TEST FOR BREAK
FA8F: 6C FE 03	412		JMP	(IRQLOC)	;USER ROUTINE VECTOR IN RAM
FA92: 28	413	BREAK	PLP
FA93: 20 4C FF	414		JSR	SAV1	;SAVE REG'S ON BREAK
FA96: 68	415		PLA		;	INCLUDING PC
FA97: 85 3A	416		STA	PCL
FA99: 68	417		PLA
FA9A: 85 3B	418		STA	PCH
FA9C: 20 82 F8	419	XBRK	JSR	INSDS1	;PRINT USER PC.
FA9F: 20 DA FA	420		JSR	RGDSP1	;	AND REG'S
FAA2: 4C 65 FF	421		JMP	MON	;GO TO MONITOR
FAA5: 18	422	XRTI	CLC
FAA6: 68	423		PLA		;SIMULATE RTI BY EXPECTING
FAA7: 85 48	424		STA	STATUS	;	STATUS FROM STACK, THEN RTS
FAA9: 68	425	XRTS	PLA		;RTS SIMULATION
FAAA: 85 3A	426		STA	PCL	;	EXTRACT PC FROM STACK
FAAC: 68	427		PLA		;	AND UPDATE PC BY 1 (LEN=0)
FAAD: 85 3B	428	PCINC2	STA	PCH
FAAF: A5 2F	429	PCINC3	LDA	LENGTH	;UPDATE PC BY LEN
FAB1: 20 56 F9	430		JSR	PCADJ3
FAB4: 84 3B	431		STY	PCH
FAB6: 18	432		CLC
FAB7: 90 14	433		BCC	NEWPCL
FAB9: 18	434	XJSR	CLC
FABA: 20 54 F9	435		JSR	PCADJ2	;UPDATE PC AND PUSH
FABD: AA	436		TAX		;	ONTO STACH FOR
FABE: 98	437		TYA		;	JSR SIMULATE
FABF: 48	438		PHA
FAC0: 8A	439		TXA
FAC1: 48	440		PHA
FAC2: A0 02	441		LDY	#$02
FAC4: 18	442	XJMP	CLC
FAC5: B1 3A	443	XJMPAT	LDA	(PCL),Y
FAC7: AA	444		TAX		;LOAD PC FOR JMP,
FAC8: 88	445		DEY		;	(JMP) SIMULATE.
FAC9: B1 3A	446		LDA	(PCL),Y
FACB: 86 3B	447		STX	PCH
FACD: 85 3A	448	NEWPCL	STA	PCL
FACF: B0 F3	449		BCS	XJMP
FAD1: A5 2D	450	RTNJMP	LDA	RTNH
FAD3: 48	451		PHA
FAD4: A5 2C	452		LDA	RTNL
FAD6: 48	453		PHA
FAD7: 20 8E FD	454	REGDSP	JSR	CROUT	;DISPLAY USER REG
FADA: A9 45	455	RGDSP1	LDA	#ACC	;	CONTENTS WITH
FADC: 85 40	456		STA	A3L	;	LABELS

II specifications

The Apple II, launched in April 1977, was one of the first highly successful mass-produced microcomputer products. It marked a significant leap in personal computing, setting standards for future developments in the industry. Created by Steve Wozniak and Steve Jobs, the Apple II differentiated itself with its user-friendly design, appealing aesthetics, and robust capabilities.

One of the standout features of the Apple II was its open architecture, which allowed users to expand and enhance the computer's functionality. This design enabled hundreds of third-party hardware and software developers to contribute to its ecosystem, resulting in an array of peripherals, including printers, modems, and storage devices. The Apple II utilized a MOS Technology 6502 microprocessor running at a clock speed of 1 MHz. Initially equipped with 4 KB of RAM, the machine could be expanded to 48 KB, accommodating more complex applications and programs.

The Apple II was also notable for its colorful graphics. It was one of the first computers to support color display, offering a 6-color palette with a resolution of 280x192 pixels in 16 colors when using its Color Graphics Card. This feature significantly enhanced the visual appeal of games and educational software developed for the platform, making computing more accessible and entertaining for various audiences.

Apple's commitment to user experience was evident in the design of the machine. It featured an integrated keyboard and a plastic case, which was both durable and visually appealing. The self-contained design included drive bays for floppy disk drives, allowing for quicker data access than traditional tape drives. It also supported audio output, enabling sound effects and music, a novelty at the time.

The introduction of the Apple DOS operating system further underscored the machine's capabilities. DOS streamlined file management and made it easier for users to navigate and manage their data. The combination of hardware and software positioned the Apple II as an educational tool and a gaming platform, fostering a vibrant software ecosystem.

The Apple II family continued to evolve, with variations like the Apple II+, IIe, and IIgs being introduced over the years. These iterations brought enhancements in memory, processing power, and graphics capabilities. The legacy of the Apple II endures, not only as a foundational product in personal computing but also as a symbol of innovation that paved the way for future advancements in technology. Its impact is still felt today, as it inspired countless developers and shaped the trajectory of the computer industry.

Apple II manual Eor

Models: II

II specifications