Rti

0613	840C	48				PHA
0614	840D	AC 5F A6				LDY	YR
0615	8410	AE 5E A6				LDX	XR
0616	8413	AD 5D A6				LDA	AR
0617	8416	40				RTI
0618	8417	C9	11		LPZB	CMP #$11		;LOAD PAPER TAPE
0619	8419	F0	03			BEQ	*+5
0620	841B	4C	A7	84		JMP	DEPZ
0621	841E	20	88	81		JSR	SAVER
0622	8421	20	4D	83		JSR	CRLF
0623	8424	A9	00			LDA	#0
0624	8426	8D	52	A6		STA	ERCNT
0625	8429	20	2E	83	LPZ	JSR	ZERCK
0626	842C	20	1B	8A	LP1	JSR	INCHR
0627	842F	C9	3B			CMP	#$3B	;SEMI COLON
0628	8431	D0	F9			BNE	LP1
0629	8433	20	A1	84		JSR	LDBYTE
0630	8436	B0	56			BCS	TAPERR
0631	8438	D0	09			BNE	NUREC
0632	843A	AD 52 A6				LDA	ERCNT	;ERRORS ?
0633	843D	F0	01			BEQ	*+3
0634	843F	38				SEC
0635	8440	4C	B8	81		JMP	RESXAF
0636	8443	8D	3D	A6	NUREC	STA	SCRD
0637	8446	20	A1	84		JSR	LDBYTE
0638	8449	B0	43			BCS	TAPERR
0639	844B	85	FF			STA	$FF
0640	844D	20	A1	84		JSR	LDBYTE
0641	8450	B0	D7			BCS	LPZ
0642	8452	85	FE			STA	$FE
0643	8454	20	A1	84	MORED	JSR	LDBYTE
0644	8457	B0	35			BCS	TAPERR
0645	8459	A0	00			LDY	#0
0646	845B	91	FE			STA	($FE),Y
0647	845D	D1	FE			CMP	($FE),Y
0648	845F	F0	0C			BEQ	LPGD
0649	8461	AD 52 A6				LDA	ERCNT
0650	8464	29	0F			AND	#$0F
0651	8466	C9	0F			CMP	#$0F
0652	8468	F0	03			BEQ	*+5
0653	846A	EE 52 A6				INC	ERCNT
0654	846D	20	B2	82	LPGD	JSR	INCCMP
0655	8470	CE 3D A6				DEC	SCRD
0656	8473	D0	DF			BNE	MORED
0657	8475	20	D9	81		JSR	INBYTE
0658	8478	B0	14			BCS	TAPERR
0659	847A	CD 37 A6				CMP	SCR7
0660	847D	D0	0C			BNE	BADDY
0661	847F	20	D9	81		JSR	INBYTE
0662	8482	B0	0A			BCS	TAPERR
0663	8484	CD 36 A6				CMP	SCR6
0664	8487	F0	A0			BEQ	LPZ
0665	8489	D0	03			BNE	TAPERR	;(ALWAYS)
0666	848B	20	D9	81	BADDY	JSR	INBYTE
0667	848E	AD 52 A6			TAPERR LDA		ERCNT
0668	8491	29	F0			AND	#$F0
0669	8493	C9	F0			CMP	#$F0
0670	8495	F0	92			BEQ	LPZ
0671	8497	AD 52 A6				LDA	ERCNT
0672	849A	69	10			ADC	#$10
0673	849C	8D	52	A6		STA	ERCNT
0674	849F	D0	88			BNE	LPZ

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.

CMP

CMP

CMP

CMP

CMP

CMP

ADC

II specifications