PRMN1 LDA | Apple II specs

F8F5: A9 00	243	PRMN1	LDA	#$00
F8F7: A0 05	244		LDY	#$05
F8F9: 06 2D	245	PRMN2	ASL	RMNEM	;SHIFT 5 BITS OF
F8FB: 26 2C	246		ROL	LMNEM	;	CHARACTER INTO A
F8FD: 2A	247		ROL		;	(CLEARS CARRY)
F8FE: 88	248		DEY
F8FF: D0 F8	249		BNE	PRMN2
F901: 69 BF	250		ADC	#$BF	;ADD "?" OFFSET
F903: 20 ED FD	251		JSR	COUT	;OUTPUT A CHAR OF MNEM
F906: CA	252		DEX
F907: D0 EC	253		BNE	PRMN1
F909: 20 48 F9	254		JSR	PRBLNK	;OUTPUT 3 BLANKS
F90C: A4 2F	255		LDY	LENGTH
F90E: A2 06	256		LDX	#$06	;CNT FOR 6 FORMAT BITS
F910: E0 03	257	PRADR1	CPX	#$03
F912: F0 1C	258		BEQ	PRADR5	;IF X=3 THEN ADDR.
F914: 06 2E	259	PRADR2	ASL	FORMAT
F916: 90 0E	260		BCC	PRADR3
F918: BD B3 F9	261		LDA	CHAR1-1,X
F91B: 20 ED FD	262		JSR	COUT
F91E: BD B9 F9	263		LDA	CHAR2-1,X
F921: F0 03	264		BEQ	PRADR3
F923: 20 ED FD	265		JSR	COUT
F926: CA	266	PRADR3	DEX
F927: D0 E7	267		BNE	PRADR1
F929: 60	268		RTS
F92A: 88	269	PRADR4	DEY
F92B: 30 E7	270		BMI	PRADR2
F92D: 20 DA FD	271		JSR	PRBYTE
F930: A5 2E	272	PRADR5	LDA	FORMAT
F932: C9 E8	273		CMP	#$E8	;HANDLE REL ADR MODE
F934: B1 3A	274		LDA	(PCL),Y	;SPECIAL (PRINT TARGET,
F936: 90 F2	275		BCC	PRADR4	;	NOT OFFSET)
F938: 20 56 F9	276	RELADR	JSR	PCADJ3
F93B: AA	277		TAX		;PCL,PCH+OFFSET+1 TO A,Y
F93C: E8	278		INX
F93D: D0 01	279		BNE	PRNTYX	;+1 TO Y,X
F93F: C8	280		INY
F940: 98	281	PRNTYX	TYA
F941: 20 DA FD	282	PRNTAX	JSR	PRBYTE	;OUTPUT TARGET ADR
F944: 8A	283	PRNTX	TXA		;	OF BRANCH AND RETURN
F945: 4C DA FD	284		JMP	PRBYTE
F948: A2 03	285	PRBLNK	LDX	#$03	;BLANK COUNT
F94A: A9 A0	286	PRBL2	LDA	#$A0	;LOAD A SPACE
F94C: 20 ED FD	287	PRBL3	JSR	COUT	;OUTPUT A BLANK
F94F: CA	288		DEX
F950: D0 F8	289		BNE	PRBL2	;LOOP UNTIL COUNT=0
F952: 60	290		RTS
F953: 38	291	PCADJ	SEC		;0=1-BYTE, 1=2-BYTE
F954: A5 2F	292	PCADJ2	LDA	LENGTH	;	2=3-BYTE
F956: A4 3B	293	PCADJ3	LDY	PCH
F958: AA	294		TAX		;TEST DISPLACEMENT SIGN
F959: 10 01	295		BPL	PCADJ4	;	(FOR REL BRANCH)
F95B: 88	296		DEY		;EXTEND NEG BY DEC PCH
F95C: 65 3A	297	PCADJ4	ADC	PCL
F95E: 90 01	298		BCC	RTS2	;PCL+LENGTH(OR DISPL)+1 TO A
F960: C8	299		INY		;	CARRY INTO Y (PCH)
F961: 60	300	RTS2	RTS
	301	* FMT1 BYTES:		XXXXXXY0 INSTRS
	302	* IF Y=0		THEN LEFT HALF BYTE
	303	* IF Y=1		THEN RIGHT HALF BYTE
	304	*		(X=INDEX)

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 PRMN1 LDA

Models: II

PRMN1

LDA

II specifications