Ovflw BRK Overflow | Apple II instruction

1E3B	00			OVFLW	BRK	OVERFLOW
				*
1E3C	20	2C	1F	CONTIN JSR FLOAT		FLOAT INT
1E3F	A2	03			LDX =3
1E41	B5	10		ENTD	LDA Z,X
1E43	95	04			STA X2,X	LOAD EXP/MANT2 WITH Z
1E45	CA				DEX
1E46	10	F9			BPL ENTD
1E48	20	4A	1F		JSR FSUB	Z*Z-FLOAT(INT)
1E4B	A2	03			LDX =3	4 BYTE MOVE
1E4D	B5	08		ZSAV	LDA X1,X
1E4F	95	10			STA Z,X	SAVE EXP/MANT1 IN Z
1E51	95	04			STA X2,X	COPY EXP/MANT1 TO EXP/MANT2
1E53	CA				DEX
1E54	10	F7			BPL ZSAV
1E56	20	77	1F		JSR FMUL	Z*Z
1E59	A2	03			LDX =3	4 BYTE MOVE
1E5B	BD DC 1E			LA2	LDA A2,X
1E5E	95	04			STA X2,X	LOAD EXP/MANT2 WITH A2
1E60	B5	08			LDA X1,X
1E62	95	18			STA SEXP,X	SAVE EXP/MANT1 AS SEXP
1E64	CA				DEX
1E65	10	F4			BPL LA2
1E67	20	50	1F		JSR FADD	Z*Z+A2
1E6A	A2	03			LDX =3	4 BYTE MOVE
1E6C	BD E0 1E			LB2	LDA B2,X
1E6F	95	04			STA X2,X	LOAD EXP/MANT2 WITH B2
1E71	CA				DEX
1E72	10	F8			BPL LB2
1E74	20	9D	1F		JSR FDIV	T=B/(Z*Z+A2)
1E77	A2	03			LDX =3	4 BYTE MOVE
1E79	B5	08		DLOAD	LDA X1,X
1E7B	95	14			STA T,X	SAVE EXP/MANT1 AS T
1E7D	BD E4 1E				LDA C2,X
1E80	95	08			STA X1,X	LOAD EXP/MANT1 WITH C2
1E82	B5	18			LDA SEXP,X
1E84	95	04			STA X2,X	LOAD EXP/MANT2 WITH SEXP
1E86	CA				DEX
1E87	10	F0			BPL DLOAD
1E89	20	77	1F		JSR FMUL	ZZC2
1E8C	20	1C	1F		JSR SWAP	MOVE EXP/MANT1 TO EXP/MANT2
1E8F	A2	03			LDX =3	4 BYTE TRANSFER
1E91	B5	14		LTMP	LDA T,X
1E93	95	08			STA X1,X	LOAD EXP/MANT1 WITH T
1E95	CA				DEX
1E96	10	F9			BPL LTMP
1E98	20	4A	1F		JSR FSUB	C2ZZ-B2/(Z*Z+A2)
1E9B	A2	03			LDX =3	4 BYTE TRANSFER
1E9D	BD E8 1E			LDD	LDA D,X
1EA0	95	04			STA X2,X	LOAD EXP/MANT2 WITH D
1EA2	CA				DEX
1EA3	10	F8			BPL LDD
1EA5	20	50	1F		JSR FADD	D+C2ZZ-B2/(Z*Z+A2)
1EA8	20	1C	1F		JSR SWAP	MOVE EXP/MANT1 TO EXP/MANT2
1EAB	A2	03			LDX =3	4 BYTE TRANSFER
1EAD	B5	10		LFA	LDA Z,X
1EAF	95	08			STA X1,X	LOAD EXP/MANT1 WITH Z
1EB1	CA				DEX
1EB2	10	F9			BPL LFA
1EB4	20	4A	1F		JSR FSUB	-Z+D+C2ZZ-B2/(Z*Z+A2)
1EB7	A2	03			LDX =3	4 BYTE TRANSFER
1EB9	B5	10		LF3	LDA Z,X

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 Ovflw BRK Overflow

Models: II

OVFLW

BRK

OVERFLOW

II specifications