Adc, H8DFF | Apple II guide

1977	8DDE 65 F8						ADC	BDRY
1978	8DE0 60						RTS
1979	8DE1
1980	8DE1 24 FD				RDCHTX BIT MODE				;READ HS OR KIM CHARACTER
1981	8DE3 10 7A						BPL RDCHT		;KIM
1982	8DE5
1983	8DE5				; RDBYTH -			READ HS BYTE
1984	8DE5				; Y DESTROYED, BYTE RETURNED IN CHAR AND A
1985	8DE5				; TIME		FROM ONE CALL TO NEXT MUST BE LESS THAN
1986	8DE5				;	START		BIT TIME (TIMER STILL RUNNING)
1987	8DE5
1988	8DE5 8E 38 A6				RDBYTH STX SCR8				;SAVE X
1989	8DE8 A2 08						LDX	#8
1990	8DEA 20 CA 8D						JSR	GETTR	;GET START BIT TIME
1991	8DED B0 14						BCS	RDBH90	;IF NOT 0, FRAMING ERR
1992	8DEF 20 CA 8D				RDBH10 JSR			GETTR	;GET BIT IN CARRY
1993	8DF2 90 04						BCC	RDASSY
1994	8DF4 20 CA 8D						JSR	GETTR	;BIT IS ONE, WAIT HALF CYC
1995	8DF7 38						SEC		;MAKE SURE "1"
1996	8DF8 66 FC				RDASSY ROR			CHAR
1997	8DFA CA						DEX
1998	8DFB D0 F2						BNE	RDBH10
1999	8DFD A5 FC						LDA	CHAR	;GET IN ACC
2000	8DFF AE 38 A6				H8DFF		LDX SCR8		;RESTORE X
2001	8E02	60					RTS
2002	8E03	24	FD		RDBH90 BIT MODE				;NO ERR IF NOT IN SYNC
2003	8E05	70	F8				BVS RDBH90-4		;OR READING WRONG REC
2004	8E07	68					PLA		;FIX STACK
2005	8E08	68					PLA
2006	8E09	4C	38	8D			JMP	FRERR
2007	8E0C
2008	8E0C				; RDBITK -			READ KIM BIT - X,Y,A DESTROYED, BIT RETURNED IN C
2009	8E0C
2010	8E0C 20 BF 8D				RDBITK JSR KGETTR				;WAIT FOR LF
2011	8E0F B0 FB						BCS	RDBITK
2012	8E11	20	BF 8D				JSR	KGETTR	;GET SECOND
2013	8E14	B0	F6				BCS	RDBITK
2014	8E16	A2	00				LDX	#0
2015	8E18	E8			RDB100 INX				;COUNT LF FULL CYCLES
2016	8E19	20	BF 8D				JSR	KGETTR
2017	8E1C 90 FA						BCC	RDB100
2018	8E1E 20 BF 8D						JSR	KGETTR	;GET SECOND
2019	8E21	90	F5				BCC	RDB100
2020	8E23	E0	08				CPX #$08		;GET BIT TO CARRY
2021	8E25	60					RTS
2022	8E26
2023	8E26	24	FD		RDBYTX BIT MODE				;READ HS OR KIM BYTE
2024	8E28	30	BB				BMI RDBYTH		;HS
2025	8E2A
2026	8E2A 20 5F 8E				RDBYT		JSR RDCHT		;READ KIM BYTE INTO CHAR AND A
2027	8E2D C9 2F						CMP #'/'		;READ ONE CHAR IF LAST
2028	8E2F F0 2C						BEQ PACKT3		;SET CARRY AND RETURN
2029	8E31	20	3C	8E			JSR	PACKT
2030	8E34	B0	26				BCS	RDRTN	;NON HEX CHAR?
2031	8E36	AA					TAX		;SAVE MSD
2032	8E37	20	5F	8E			JSR	RDCHT
2033	8E3A 86 FC						STX	CHAR	;MOVE MSD TO CHAR
2034	8E3C				; AND FALL			INTO PACKT AGAIN
2035	8E3C
2036	8E3C				;PACKT		- ASCII HEX TO 4 BITS
2037	8E3C				;INPUT IN A, OUTPUT IN CHAR AND A, CARRY SET = NON HEX
2038	8E3C

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 Adc, H8DFF

Models: II

ADC

H8DFF

TAX

II specifications