Addblk, ADDS1A, Bkcksm, Brcomp, Backwd

4158	FF99 00		.DB	0
4159	FF9A
4160	FF9A EE 68 01	PAT22	INC	BLKO
4161	FF9D 4C BD ED		JMP	ADDBK1
4162	FFA0
4163	FFA0 A9 FF	PAT23	LDA #$FF		;START TIMER
4164	FFA2 8D 97 A4		STA	DI1024
4165	FFA5 AD 85 A4	PAT23A LDA		RINT	;TIME OUT?
4166	FFA8 30 08		BMI	PAT23B	;YES
4167	FFAA AD 0D A8		LDA	IFR	;START SIGNAL?
4168	FFAD 29 10		AND	#MPRST
4169	FFAF F0 F4		BEQ	PAT23A	;NO
4170	FFB1 60		RTS		;YES
4171	FFB2 A9 00	PAT23B LDA		#0	;TIME OUT RETURN
4172	FFB4 60		RTS
4173	FFB5
4174	FFB5 20 75 EE	PATC24 JSR CKFREQ			;READ BIT FROM FOURTH HALF PULSE
4175	FFB8 6A		ROR	A
4176	FFB9 29 80		AND	#$80
4177	FFBB 60		RTS
4178	FFBC
4179	FFBC 2C 0D A8	PATC25 BIT IFR			;WAIT TILL TIMES OUT
4180	FFBF 50 FB		BVC PATC25
4181	FFC1 AD 04 A8		LDA T1L		;CLR INTERRUPT FLG
4182	FFC4 60		RTS
4183	FFC5
4184	FFF9		*=$FFF9
4185	FFF9	;INTERRUPT VECTORS
4186	FFF9 FA		.DB $FA
4187	FFFA 75E0BFE078E0		.DW NMIV1,RSET,IRQV1			;SET UP VECTORS
4188	10000	;.END A0/1
4189	10000	SEMICOLON =$3B
4190	10000	BACKSLASH =$5C
4191	10000		.END M1
Label	Value	Label		Value	Label		Value
------------------		------------------			------------------
ASSEM	D000	ADFLD		0133	ADDR		A41C
ACR	A80B	ADDS1		E55D	ADD1		E565
ADDIN	EAAE	ADDNE		EAB1	ADDN1		EAB7
ADDN2	EAC7	ADDN3		EADC	ADDN4		EAE8
ADDN5	EAF7	ADDN6		EAFD	ADDN7		EB0D
ADDN8	EB2B	ADDBLK		EDBA	ADDBK1		EDBD
ATTOP	F8DB	ATBOT		F8E9	AT02		F8F5
AT01	F8F7	ATEND		F8F9	ADDRS1		F910
ADDS1A	F916	AD1		F928	ADDA		F92A
ADDA1	F933	ACCUM		FC23	ABSIND		FC5C
ABSY	FC63	ABSY1		FC6E	ABSX		FC72
ABSOL	FCA6	ABSOL1		FCB2	BASIEN		B000
BASIRE	B003	BOTLN		00E1	BKS		0100
BYTESM	A42F	BKFLG		A410	BLK		0115
BLKO	0168	BRKA		E61B	BRK1		E620
BKERR	E62F	BKOK		E634	BKO2		E64C
BRKK	E6E5	BRK3		E6F1	BRK2		E6F3
BRK4	E6FA	BLANK2		E83B	BLANK		E83E
BKCKSM	F1E7	BKCK1		F1F1	BKCK2		F20F
BKCK3	F21A	BT		F721	BRNCHC		FD0F
BRCOMP	FD86	BACKWD		FDD9	BACKSLASH		005C
CH	0130	CODFLG		A437	CURPO2		A415
CURPOS	A416	CNTH30		A417	CNTL30		A418

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 Addblk, ADDS1A, Bkcksm, Brcomp, Backwd

Models: II

ADDBLK

ADDS1A

BYTESM

BKCKSM

BRCOMP

BACKWD

II specifications