Apple II specification

1EBB	95	04			STA X2,X	LOAD EXP/MANT2 WITH Z
1EBD	CA				DEX
1EBE	10	F9			BPL LF3
1EC0	20	9D	1F		JSR FDIV	Z/(**** )
1EC3	A2	03			LDX =3	4 BYTE TRANSFER
1EC5	BD E5 1D			LD12	LDA MHLF,X
1EC8	95	04			STA X2,X	LOAD EXP/MANT2 WITH .5
1ECA	CA				DEX
1ECB	10	F8			BPL LD12
1ECD	20	50	1F		JSR FADD	+Z/(***)+.5
1ED0	38				SEC	ADD INT TO EXPONENT WITH CARRY SET
1ED1	A5	1C			LDA INT	TO MULTIPLY BY
1ED3	65	08			ADC X1	2**(INT+1)
1ED5	85	08			STA X1	RETURN RESULT TO EXPONENT
1ED7	60				RTS	RETURN ANS=(.5+Z/(-Z+D+C2ZZ-B2/(ZZ+A2))2**(INT+1)
1ED8	80	5C		L2E	DCM 1.4426950409 LOG BASE 2 OF E
	55	1E
1EDC	86	57		A2	DCM 87.417497202
	6A	E1
1EE0	89	4D		B2	DCM 617.9722695
	3F	1D
1EE4	7B	46		C2	DCM .03465735903
	FA 70
1EE8	83	4F		D	DCM 9.9545957821
	A3	03		*
				*
				*
				*	BASIC FLOATING POINT ROUTINES
1F00				*	ORG $1F00	START OF BASIC FLOATING POINT ROUTINES
1F00					ORG $1F00	START OF BASIC FLOATING POINT ROUTINES
1F00	18			ADD	CLC	CLEAR CARRY
1F01	A2	02			LDX =$02	INDEX FOR 3-BYTE ADD
1F03	B5	09		ADD1	LDA M1,X
1F05	75	05			ADC M2,X	ADD A BYTE OF MANT2 TO MANT1
1F07	95	09			STA M1,X
1F09	CA				DEX	ADVANCE INDEX TO NEXT MORE SIGNIF.BYTE
1F0A	10	F7			BPL ADD1	LOOP UNTIL DONE.
1F0C	60				RTS	RETURN
1F0D	06	03		MD1	ASL SIGN	CLEAR LSB OF SIGN
1F0F	20	12	1F		JSR ABSWAP	ABS VAL OF MANT1, THEN SWAP MANT2
1F12	24	09		ABSWAP BIT M1		MANT1 NEG?
1F14	10	05			BPL ABSWP1	NO,SWAP WITH MANT2 AND RETURN
1F16	20	8F	1F		JSR FCOMPL	YES, COMPLIMENT IT.
1F19	E6	03			INC SIGN	INCR SIGN, COMPLEMENTING LSB
1F1B	38			ABSWP1 SEC		SET CARRY FOR RETURN TO MUL/DIV
				*

*SWAP EXP/MANT1 WITH EXP/MANT2

1F1C	A2	04	SWAP	LDX =$04	INDEX FOR 4-BYTE SWAP.
1F1E	94	0B	SWAP1	STY E-1,X
1F20	B5	07		LDA X1-1,X	SWAP A BYTE OF EXP/MANT1 WITH
1F22	B4	03		LDY X2-1,X	EXP/MANT2 AND LEAVEA COPY OF
1F24	94	07		STY X1-1,X	MANT1 IN E(3BYTES). E+3 USED.
1F26	95	03		STA X2-1,X
1F28	CA			DEX	ADVANCE INDEX TO NEXT BYTE
1F29	D0	F3		BNE SWAP1	LOOP UNTIL DONE.
1F2B	60		*	RTS
			*

*CONVERT 16 BIT INTEGER IN M1(HIGH) AND M1+1(LOW) TO F.P.

*RESULT IN EXP/MANT1. EXP/MANT2 UNEFFECTED

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 1EBB STA X2,X Load EXP/MANT2 with Z 1EBD DEX 1EBE BPL LF3

Models: II

1EBB

STA X2,X

LOAD EXP/MANT2 WITH Z

1EBD

DEX

1EBE

BPL LF3

II specifications