STA A3H FAE2 A2 FB | Apple II specification

FADE: A9 00	457		LDA	#ACC/256
FAE0: 85 41	458		STA	A3H
FAE2: A2 FB	459		LDX	#$FB
FAE4: A9 A0	460	RDSP1	LDA	#$A0
FAE6: 20 ED FD	461		JSR	COUT
FAE9: BD 1E FA	462		LDA RTBL-$FB,X
FAEC: 20 ED FD	463		JSR	COUT
FAEF: A9 BD	464		LDA	#$BD
FAF1: 20 ED FD	465		JSR	COUT
FAF4: B5 4A	466		LDA	ACC+5,X
FAF6: 20 DA FD	467		JSR	PRBYTE
FAF9: E8	468		INX
FAFA: 30 E8	469		BMI	RDSP1
FAFC: 60	470		RTS
FAFD: 18	471	BRANCH	CLC		;BRANCH TAKEN,
FAFE: A0 01	472		LDY	#$01	;	ADD LEN+2 TO PC
FB00: B1 3A	473		LDA	(PCL),Y
FB02: 20 56 F9	474		JSR	PCADJ3
FB05: 85 3A	475		STA	PCL
FB07: 98	476		TYA
FB08: 38	477		SEC
FB09: B0 A2	478		BCS	PCINC2
FB0B: 20 4A FF	479	NBRNCH	JSR	SAVE	;NORMAL RETURN AFTER
FB0E: 38	480		SEC		;	XEQ USER OF
FB0F: B0 9E	481		BCS	PCINC3	;GO UPDATE PC
FB11: EA	482	INITBL	NOP
FB12: EA	483		NOP		;DUMMY FILL FOR
FB13: 4C 0B FB	484		JMP	NBRNCH	;	XEQ AREA
FB16: 4C FD FA	485		JMP	BRANCH
FB19: C1	486	RTBL	DFB	$C1
FB1A: D8	487		DFB	$D8
FB1B: D9	488		DFB	$D9
FB1C: D0	489		DFB	$D0
FB1D: D3	490		DFB	$D3
FB1E: AD 70 C0	491	PREAD	LDA	PTRIG	;TRIGGER PADDLES
FB21: A0 00	492		LDY	#$00	;INIT COUNT
FB23: EA	493		NOP		;COMPENSATE FOR 1ST COUNT
FB24: EA	494		NOP
FB25: BD 64 C0	495	PREAD2	LDA	PADDL0,X	;COUNT Y-REG EVERY
FB28: 10 04	496		BPL	RTS2D	;	12 USEC
FB2A: C8	497		INY
FB2B: D0 F8	498		BNE	PREAD2	;	EXIT AT 255 MAX
FB2D: 88	499		DEY
FB2E: 60	500	RTS2D	RTS
FB2F: A9 00	501	INIT	LDA	#$00	;CLR STATUS FOR DEBUG
FB31: 85 48	502		STA	STATUS	;	SOFTWARE
FB33: AD 56 C0	503		LDA	LORES
FB36: AD 54 C0	504		LDA	LOWSCR	;INIT VIDEO MODE
FB39: AD 51 C0	505	SETTXT	LDA	TXTSET	;SET FOR TEXT MODE
FB3C: A9 00	506		LDA	#$00	;	FULL SCREEN WINDOW
FB3E: F0 0B	507		BEQ	SETWND
FB40: AD 50 C0	508	SETGR	LDA	TXTCLR	;SET FOR GRAPHICS MODE
FB43: AD 53 C0	509		LDA	MIXSET	;	LOWER 4 LINES AS
FB46: 20 36 F8	510		JSR	CLRTOP	;	TEXT WINDOW
FB49: A9 14	511		LDA	#$14
FB4B: 85 22	512	SETWND	STA	WNDTOP	;SET FOR 40 COL WINDOW
FB4D: A9 00	513		LDA	#$00	;	TOP IN A-REG,
FB4F: 85 20	514		STA	WNDLFT	;	BTTM AT LINE 24
FB51: A9 28	515		LDA	#$28
FB53: 85 21	516		STA	WNDWDTH
FB55: A9 18	517		LDA	#$18
FB57: 85 23	518		STA	WNDBTM	;	VTAB TO ROW 23

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 STA A3H FAE2 A2 FB

Models: II

STA

A3H

FAE2: A2 FB

II specifications