Tax, Adc | Apple II guide

0117	801F	6C	F6	FF		JMP	($FFF6)
0118	8022	68			DETIRQ PLA			;IRQ (NON BRK)
0119	8023	AA				TAX
0120	8024	68				PLA
0121	8025	28				PLP
0122	8026	6C	F8	FF		JMP	($FFF8)
0123	8029	20	86	8B	SVIRQ	JSR ACCESS		;SAVE REGS AND DISPLAY CODE
0124	802C	38				SEC
0125	802D	20	64	80		JSR	SAVINT
0126	8030	A9	31			LDA	#'1'
0127	8032	4C	53	80		JMP	IDISP
0128	8035	08			USRENT PHP			;USER ENTRY
0129	8036	20	86	8B		JSR	ACCESS
0130	8039	38				SEC
0131	803A	20	64	80		JSR	SAVINT
0132	803D	EE 59 A6				INC	PCLR
0133	8040	D0	03			BNE	*+5
0134	8042	EE 5A A6				INC	PCHR
0135	8045	A9	33			LDA	#'3'
0136	8047	4C	53	80		JMP	IDISP
0137	804A	20	86	8B	SVBRK	JSR	ACCESS
0138	804D	18				CLC
0139	804E	20	64	80		JSR	SAVINT
0140	8051	A9	30			LDA	#'0'
0141	8053				; INTRPT CODES 0 = BRK
0142	8053				;		1 = IRQ
0143	8053				;		2 = NMI
0144	8053				;		3 = USER ENTRY
0145	8053	48			IDISP	PHA		;OUT PC, INTRPT CODE (FROM A)
0146	8054	20	D3	80		JSR	DBOFF	;STOP NMI'S
0147	8057	20	4D	83		JSR	CRLF
0148	805A	20	37	83		JSR	OPCCOM
0149	805D	68				PLA
0150	805E	20	47	8A		JSR	OUTCHR
0151	8061	4C	03	80		JMP	WARM
0152	8064	8D	5D	A6	SAVINT STA		AR	;SAVE USER REGS AFTER INTRPT
0153	8067	8E	5E	A6		STX	XR
0154	806A	8C	5F	A6		STY	YR
0155	806D	BA				TSX
0156	806E	D8				CLD
0157	806F	BD 04 01				LDA	$104,X
0158	8072	69	FF			ADC	#$FF
0159	8074	8D	59	A6		STA	PCLR
0160	8077	BD 05 01				LDA	$105,X
0161	807A	69	FF			ADC	#$FF
0162	807C	8D	5A	A6		STA	PCHR
0163	807F	BD 03 01				LDA	$103,X
0164	8082	8D	5C	A6		STA	FR
0165	8085	BD 02 01				LDA	$102,X
0166	8088	9D	05	01		STA	$105,X
0167	808B	BD 01 01				LDA	$101,X
0168	808E	9D	04	01		STA	$104,X
0169	8091	E8				INX
0170	8092	E8				INX
0171	8093	E8				INX
0172	8094	9A				TXS
0173	8095	E8				INX
0174	8096	E8				INX
0175	8097	8E	5B	A6		STX	SR
0176	809A	60				RTS
0177	809B	20	86	8B	SVNMI	JSR ACCESS		;TRACE IF TV NE 0
0178	809E	38				SEC

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 Tax, Adc

Models: II

TAX

ADC

II specifications