EC5E 4A LSR Only ROW | Apple II instruction

1903	EC5E 4A		LSR	A	;ONLY ROW 1
1904	EC5F 90 06		BCC GETK00		;GOT YOU
1905	EC61 68		PLA
1906	EC62 CA		DEX
1907	EC63 D0 F0		BNE	GETK0
1908	EC65 F0 DC		BEQ GETKY		;THERE IS A MISTAKE CHECK AGAIN
1909	EC67 68	GETK00 PLA			;NOW GET STBKEY INTO X
1910	EC68 AD 2B A4		LDA STBKEY		;CLMN INTO X
1911	EC6B 49 FF		EOR #$FF		;COMPLEMENT BECAUSE STRBS ARE 0
1912	EC6D AA		TAX		;CTRL OR SHIFT TO X
1913	EC6E EE 2A A4		INC KMASK		;SET MSK=$01
1914	EC71	;NOW GET ANY KEY
1915	EC71 20 05 ED	GETK1	JSR ONEKEY		;GET A KEY
1916	EC74 88		DEY		;CHK THE ROW (1-8)
1917	EC75 D0 09		BNE GETK1B		;CHK IF CTRL OR SHIFT
1918	EC77 AD 2B A4		LDA STBKEY		;WERE ENTERED AT THE LAST MOMENT
1919	EC7A C9 F7		CMP #$F7		;IF CLMN 5,6,7,8 TO IT AGAIN
1920	EC7C B0 04		BCS	GETK2
1921	EC7E 90 C3		BCC	GETKY	;SEND IT TO GET CTRL OR SHIFT
1922	EC80 30 C1	GETK1B BMI		GETKY	;NO KEY ,CLEAR MSK
1923	EC82	;WE HAVE A		KEY ,DECODE	IT
1924	EC82 20 2C ED	GETK2	JSR DEBK1		;DEBOUNCE KEY (5 MSEC)
1925	EC85 98		TYA		;MULT BY 8
1926	EC86 0A		ASL	A
1927	EC87 0A		ASL	A
1928	EC88 0A		ASL	A
1929	EC89 A8		TAY		;NOW Y HAS ROW ADDR FROM ROW 1
1930	EC8A AD 2B A4		LDA STBKEY		;ADD COLUMN TO Y
1931	EC8D 4A	GETK3	LSR	A
1932	EC8E 90 03		BCC	GETK4
1933	EC90 C8		INY
1934	EC91 D0 FA		BNE	GETK3
1935	EC93 B9 21 F4	GETK4	LDA ROW1,Y		;GET THE CHR
1936	EC96 48		PHA
1937	EC97 8A		TXA		;SEE IF CTRL OR SHIFT WAS USED
1938	EC98 F0 24		BEQ GETK7		;BRCH IF NO CTRL OR SHIFT
1939	EC9A 29 10		AND #$10		;CTRL ?
1940	EC9C F0 06		BEQ GETK5		;NO ,GO GETKS
1941	EC9E 68		PLA
1942	EC9F 29 3F		AND #$3F		;MSK OFF 2 MSB FOR CONTROL
1943	ECA1 4C BF EC		JMP GETK8		;EXIT
1944	ECA4 68	GETK5	PLA
1945	ECA5 48		PHA		;SAVE IT
1946	ECA6 29 40		AND #$40		;IF ALPHA CHARS DO NOT SHIFT
1947	ECA8 D0 14		BNE	GETK7
1948	ECAA 68		PLA
1949	ECAB 48		PHA
1950	ECAC 29 0F		AND #$0F		;ONLY LSB
1951	ECAE F0 0E		BEQ GETK7		;DO NOT INTERCHANGE <SPACE> OR 0
1952	ECB0 C9 0C		CMP #$0C		;ACC>=$0C ?
1953	ECB2 B0 05		BCS GETK6		;YES ACC>=$0C
1954	ECB4 68		PLA		;NO, ACC<$0C
1955	ECB5 29 EF		AND #$EF		;STRIP OFF BIT 4
1956	ECB7 D0 06		BNE GETK8		;EXIT
1957	ECB9 68	GETK6	PLA		;ACC>=$0C
1958	ECBA 09 10		ORA #$10		;BIT 4= 1
1959	ECBC D0 01		BNE GETK8		;EXIT
1960	ECBE 68	GETK7	PLA
1961	ECBF	;CHECK FOR		"ADV PAP","PRI LINE", OR "TOGL PRIFLG"
1962	ECBF	;IN THIS WAY WE DONT HAVE TO CHCK FOR THIS COMM
1963	ECBF C9 60	GETK8	CMP #$60		;ADV PAPER COMM
1964	ECC1 D0 06		BNE	GETK11

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 EC5E 4A LSR Only ROW

Models: II

EC5E 4A

LSR

;ONLY ROW 1

II specifications