ED3B GET a Char from Tape Subroutine

2027	ED3B	;GET A CHAR FROM TAPE SUBROUTINE
2028	ED3B	;A BUFFER IS USED TO GET BLOCKS OF DATA
2029	ED3B	;FROM TAPE		,EXCEPT WHEN FORMAT EQUAL TO
2030	ED3B	;KIM-1 (THE WHOLE FILE IS LOADED AT ONE TIME)
2031	ED3B 20 9E EB	TIBYTE JSR PHXY			;PUSH X
2032	ED3E AE 36 A4		LDX TAPTR		;POINTER FOR BUFFER
2033	ED41 E0 50		CPX #80		;IS BUFFER EMPTY ?
2034	ED43 D0 03		BNE	TIB1
2035	ED45 20 53 ED		JSR	TIBY1	;LOAD ANOTHER BLOCK
2036	ED48 BD 16 01	TIB1	LDA	TABUFF,X
2037	ED4B E8		INX
2038	ED4C 8E 36 A4		STX	TAPTR
2039	ED4F 20 AC EB		JSR PLXY		;PULL X
2040	ED52 60		RTS
2041	ED53	;LOAD A BLOCK FROM TAPE INTO BUFFER
2042	ED53 20 EA ED	TIBY1	JSR TAISET		;SET TAPE FOR INPUT
2043	ED56 20 29 EE	TIBY3	JSR GETTAP		;GET A CHAR FROM TAPE
2044	ED59 C9 23		CMP #'#'		;CHECK FIRST CHR FOR
2045	ED5B F0 06		BEQ TIBY4		;START OF BLOCK
2046	ED5D C9 16		CMP #$16		;IF NOT # SHOULD BE SYN
2047	ED5F D0 F2		BNE	TIBY1
2048	ED61 F0 F3		BEQ	TIBY3
2049	ED63 A2 00	TIBY4	LDX	#0
2050	ED65 20 29 EE	TIBY5	JSR	GETTAP	;NOW LOAD INTO BUFFER
2051	ED68 9D 16 01		STA	TABUFF,X
2052	ED6B E8		INX
2053	ED6C E0 52		CPX	#82
2054	ED6E D0 F5		BNE	TIBY5
2055	ED70 AD 00 A8		LDA	DRB
2056	ED73 29 CF		AND	#$CF
2057	ED75 8D 00 A8		STA	DRB	;TURN OFF TAPES
2058	ED78 58		CLI		;ENABL INTERR
2059	ED79 20 BD ED		JSR	ADDBK1	;DISPLAY BLK COUNT
2060	ED7C A2 00		LDX	#0	;TO CLEAR PTR IN TIBYTE
2061	ED7E AD 15 01		LDA	BLK	;CHECK THE BLOCK COUNT
2062	ED81 F0 05		BEQ	TIBY5A	;IF FIRST BLK ,DO NOT CMP
2063	ED83 DD 16 01		CMP	TABUFF,X
2064	ED86 D0 28		BNE TIBY7		;BRANCH IF WE MISSED ONE BLOCK
2065	ED88 E8	TIBY5A INX
2066	ED89 8E 36 A4		STX	TAPTR
2067	ED8C EE 15 01		INC	BLK	;INCR BLK CONT
2068	ED8F AD 67 01		LDA TABUFF+81		;STORE THIS BLK CKSUM
2069	ED92 48		PHA
2070	ED93 AD 66 01		LDA	TABUFF+80
2071	ED96 48		PHA
2072	ED97 CE 12 A4		DEC INFLG		;SET INFLG DIFF FROM OUTFLG
2073	ED9A 20 E7 F1		JSR BKCKSM		;COMPUT BLK CKSUM FOR THIS BLK
2074	ED9D 68		PLA
2075	ED9E CD 66 01		CMP TABUFF+80		;DO THEY AGREE ?
2076	EDA1 D0 0C		BNE	TIBY6
2077	EDA3 68		PLA
2078	EDA4 CD 67 01		CMP	TABUFF+81
2079	EDA7 D0 07		BNE	TIBY7
2080	EDA9 EE 12 A4		INC	INFLG	;RESTORE INPUT DEVICE
2081	EDAC A2 01		LDX	#1	;TO GET FIRST CHR IN TIBYTE
2082	EDAE 60		RTS
2083	EDAF 68	TIBY6	PLA		;RESTORE STACK PTR
2084	EDB0 68	TIBY7	PLA
2085	EDB1 68		PLA
2086	EDB2 68		PLA
2087	EDB3 68		PLA
2088	EDB4 20 8E E3		JSR	CKER0

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 ED3B GET a Char from Tape Subroutine

Models: II

ED3B

;GET A CHAR FROM TAPE SUBROUTINE

CMP

CMP

II specifications