LDA END+1 CMP with END | Apple II instruction

3070	F692	A5	E6		LDA	END+1	;CMP WITH END
3071	F694	CD 1D A4			CMP	ADDR+1
3072	F697	F0	11		BEQ	EDI7
3073	F699	B0	13		BCS	EDI8
3074	F69B 20 BC F8			EDI6	JSR	TOPNO	;RESTORE NOWLN
3075	F69E A9 00				LDA	#0
3076	F6A0 91 DF				STA	(NOWLN),Y	;END OF TEXT MARKER
3077	F6A2 20 13 EA				JSR	CRLOW
3078	F6A5 A9 52				LDA	#'R'	;FORCE READ COMMAND
3079	F6A7 4C 8D FA				JMP	ENTRY
3080	F6AA A5 E5			EDI7	LDA	END	;IF ZERO MEM IS OKAY
3081	F6AC F0 ED				BEQ	EDI6
3082	F6AE A9 00			EDI8	LDA	#0
3083	F6B0 8D 1C A4				STA	ADDR
3084	F6B3 4C 33 EB				JMP MEMERR		;NO MEMORY FOR THOSE LIMITS
3085	F6B6
3086	F6B6 A0 00			EDI	LDY	#0	;CHCK IF MEMORY WRITES
3087	F6B8 20 B7 FE				JSR	PATCH6	;GET BYTE ADDR BY ADDR,ADDR+1
3088	F6BB 48				PHA		;SAVE IT
3089	F6BC A9 AA				LDA	#$AA	;SET THIS PATTERN
3090	F6BE 20 78 EB				JSR	SADDR	;CHCK IT
3091	F6C1 D0 09				BNE	EDI2B
3092	F6C3 68				PLA
3093	F6C4 20 78 EB				JSR SADDR		;RESTORE CHR
3094	F6C7 EE 1D A4				INC ADDR+1		;NEXT PAG
3095	F6CA 18				CLC		;IT WROTE
3096	F6CB 60				RTS
3097	F6CC 38			EDI2B	SEC		;DIDNT WRITE
3098	F6CD 68				PLA
3099	F6CE 60				RTS
3100	F6CF
3101	F6CF			;*** T COMMAND-REENTRY EDITOR ***
3102	F6CF			;RE-ENTRY POINT,TEXT ALREADY THERE
3103	F6CF 20 24 EA			REENTR JSR CRCK			;<CR> IF PRI ON
3104	F6D2 20 BC F8			TP	JSR TOPNO		;GO TO TOP
3105	F6D5 4C B9 F7				JMP IN03A		;DISPLAY LINE
3106	F6D8
3107	F6D8			;*** U COMMAND-UP LINE ***
3108	F6D8			;GO UP ONE		LINE BUT...
3109	F6D8			;DOWN IN ADDRESSING MEMORY
3110	F6D8 20 DB F8			DNNO	JSR ATTOP		;THIS RTN DOESNT PRINT
3111	F6DB 90 06				BCC DOW1		;NOT TOP
3112	F6DD 20 27 F7				JSR PLNE		;ARE AT TOP
3113	F6E0 4C 78 FA				JMP	ERR0
3114	F6E3 A0 00			DOW1	LDY	#0
3115	F6E5 20 1D F9				JSR	SUB	;DECREMENT NOWLN PAST <CR>
3116	F6E8 20 1D F9			DOW2	JSR	SUB
3117	F6EB 20 DB F8				JSR	ATTOP
3118	F6EE B0 30				BCS	UP4
3119	F6F0 B1 DF				LDA	(NOWLN),Y
3120	F6F2 C9 0D				CMP	#CR
3121	F6F4 D0 F2				BNE	DOW2
3122	F6F6 4C 28 F9				JMP	AD1
3123	F6F9
3124	F6F9			;*** D COMMAND-DOWN LINE ***
3125	F6F9			;GO DOWN ONE LINE BUT...
3126	F6F9			;UP IN ADDRESSING MEMORY
3127	F6F9 20 09 F7			UP	JSR	UPNO
3128	F6FC 20 27 F7				JSR	PLNE	;DISPLAY LINE & CHCK BOTTOM
3129	F6FF 20 E9 F8				JSR	ATBOT
3130	F702	90 1C			BCC	UP4
3131	F704	A0 72			LDY	#EMSG2-M1	;PRINT "END"

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 LDA END+1 CMP with END

Models: II

LDA

END+1

;CMP WITH END

CMP

CMP

II specifications