Ora, Kgettr LDA | Apple II specs

1915	8D69	85	F8		SY100	STA	BDRY
1916	8D6B A9 6D					LDA	#$6D
1917	8D6D 8D 00 A4					STA	DIG	;INDICATE NO SYNC ON LEDS
1918	8D70	A5	FD			LDA	MODE	;TURN ON OUT OF SYNC MODE
1919	8D72	09	40			ORA	#$40	;BIT6
1920	8D74	85	FD			STA	MODE
1921	8D76	A9	7F		SYNC5	LDA	#$7F	;TEST FOR CR DOWN ON HKB
1922	8D78	8D	01	A4		STA	DDRDIG
1923	8D7B 2C 00 A4					BIT	DIG
1924	8D7E 10 CB					BPL	USRREQ	;CR KEY DOWN - EXIT (ERRORS)
1925	8D80	20	9F	8D		JSR	SYNBIT
1926	8D83	66	FC			ROR	CHAR
1927	8D85	A5	FC			LDA	CHAR
1928	8D87	C9	16			CMP	#SYN
1929	8D89	D0	EB			BNE	SYNC5
1930	8D8B A2 0A				SYNC10 LDX		#10	;NOW MAKE SURE CAN GET 10 SYNS
1931	8D8D 20 E1 8D					JSR	RDCHTX
1932	8D90	C9	16			CMP	#SYN
1933	8D92	D0	E2			BNE	SYNC5
1934	8D94	CA				DEX
1935	8D95	D0	F6			BNE	SYNC10+2
1936	8D97	8E	00	A4		STX	DIG	;TURN OFF DISPLAY
1937	8D9A CA					DEX		;X=$FF
1938	8D9B 8E 01 A4					STX	DDRDIG
1939	8D9E 60					RTS
1940	8D9F				;SYNBIT - GET BIT IN SYN SEARCH. IF HS, ENTER WITH
1941	8D9F				; TIMER STARTED BY PREV BIT, BIT RETURNED IN CARRY.
1942	8D9F
1943	8D9F 24 FD				SYNBIT BIT MODE			;KIM OR HS?
1944	8DA1 10 69					BPL RDBITK		;KIM
1945	8DA3 20 CA 8D					JSR GETTR		;HS
1946	8DA6 B0 22					BCS GETTR		;IF SHORT, GET NEXT TRANS
1947	8DA8 60					RTS		;BIT IS ZERO
1948	8DA9
1949	8DA9 84 FD				START	STY MODE		;MODE PARM PASSED IN [Y]
1950	8DAB 20 86 8B					JSR ACCESS		;FIX BASIC WARM START BUG
1951	8DAE A9 09					LDA	#9
1952	8DB0 20 A5 89					JSR	CONFIG	;PARTIAL I/O CONFIGURATION
1953	8DB3 20 2E 83					JSR	ZERCK	;ZERO THE CHECK SUM
1954	8DB6 20 9C 82					JSR	P2SCR	;MOVE SA TO FE,FF IN PAGE ZERO
1955	8DB9 A2 EC					LDX	#$EC
1956	8DBB 8E 0C A0				STCC	STX VIAPCR		;TAPE ON
1957	8DBE 60					RTS
1958	8DBF
1959	8DBF				; GETTR - GET TRANSITION TIME FROM 6532 CLOCK
1960	8DBF				; DESTROYS		A,Y
1961	8DBF
1962	8DBF A9 00				KGETTR LDA		#0	;KIM GETTR - GET FULL CYCLE
1963	8DC1 85 F9					STA	OLD	;FORCE GETTR POLARITY
1964	8DC3 AD 00 A0				KG100	LDA	TAPIN	;WAIT TIL INPUT LO
1965	8DC6 29 40					AND	#$40
1966	8DC8 D0 F9					BNE	KG100
1967	8DCA
1968	8DCA A0 FF				GETTR	LDY	#$FF
1969	8DCC AD 00 A0				NOTR	LDA	TAPIN
1970	8DCF 29 40					AND	#$40
1971	8DD1 C5 F9					CMP	OLD
1972	8DD3 F0 F7					BEQ	NOTR	;NO CHANGE
1973	8DD5 85 F9					STA	OLD
1974	8DD7 AD 06 A4					LDA	TIMER
1975	8DDA 8C 15 A4					STY TIM8		;RESTART CLOCK
1976	8DDD 18					CLC

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 Ora, Kgettr LDA

Models: II

ORA

STA

CMP

CMP

KGETTR LDA

CMP

II specifications