1EAD LFA LDA Z,X | Apple II specification

218	1E56	20	77	1F		JSR FMUL	Z*Z
219	1E59	A2	03			LDX =3	4 BYTE MOVE
220	1E5B	BD DC 1E			LA2	LDA A2,X
221	1E5E	95	04			STA X2,X	LOAD EXP/MANT2 WITH A2
222	1E60	B5	08			LDA X1,X
223	1E62	95	18			STA SEXP,X	SAVE EXP/MANT1 AS SEXP
224	1E64	CA				DEX
225	1E65	10	F4			BPL LA2
226	1E67	20	50	1F		JSR FADD	Z*Z+A2
227	1E6A	A2	03			LDX =3	4 BYTE MOVE
228	1E6C	BD E0 1E			LB2	LDA B2,X
229	1E6F	95	04			STA X2,X	LOAD EXP/MANT2 WITH B2
230	1E71	CA				DEX
231	1E72	10	F8			BPL LB2
232	1E74	20	9D	1F		JSR FDIV	T=B/(Z*Z+A2)
233	1E77	A2	03			LDX =3	4 BYTE MOVE
234	1E79	B5	08		DLOAD	LDA X1,X
235	1E7B	95	14			STA T,X	SAVE EXP/MANT1 AS T
236	1E7D	BD E4 1E				LDA C2,X
237	1E80	95	08			STA X1,X	LOAD EXP/MANT1 WITH C2
238	1E82	B5	18			LDA SEXP,X
239	1E84	95	04			STA X2,X	LOAD EXP/MANT2 WITH SEXP
240	1E86	CA				DEX
241	1E87	10	F0			BPL DLOAD
242	1E89	20	77	1F		JSR FMUL	ZZC2
243	1E8C	20	1C	1F		JSR SWAP	MOVE EXP/MANT1 TO EXP/MANT2
244	1E8F	A2	03			LDX =3	4 BYTE TRANSFER
245	1E91	B5	14		LTMP	LDA T,X
246	1E93	95	08			STA X1,X	LOAD EXP/MANT1 WITH T
247	1E95	CA				DEX
248	1E96	10	F9			BPL LTMP
249	1E98	20	4A	1F		JSR FSUB	C2ZZ-B2/(Z*Z+A2)
250	1E9B	A2	03			LDX =3	4 BYTE TRANSFER
251	1E9D	BD E8 1E			LDD	LDA D,X
252	1EA0	95	04			STA X2,X	LOAD EXP/MANT2 WITH D
253	1EA2	CA				DEX
254	1EA3	10	F8			BPL LDD
255	1EA5	20	50	1F		JSR FADD	D+C2ZZ-B2/(Z*Z+A2)
256	1EA8	20	1C	1F		JSR SWAP	MOVE EXP/MANT1 TO EXP/MANT2
257	1EAB	A2	03			LDX =3	4 BYTE TRANSFER
258	1EAD	B5	10		LFA	LDA Z,X
259	1EAF	95	08			STA X1,X	LOAD EXP/MANT1 WITH Z
260	1EB1	CA				DEX
261	1EB2	10	F9			BPL LFA
262	1EB4	20	4A	1F		JSR FSUB	-Z+D+C2ZZ-B2/(Z*Z+A2)
263	1EB7	A2	03			LDX =3	4 BYTE TRANSFER
264	1EB9	B5	10		LF3	LDA Z,X
265	1EBB	95	04			STA X2,X	LOAD EXP/MANT2 WITH Z
266	1EBD	CA				DEX
267	1EBE	10	F9			BPL LF3
268	1EC0	20	9D	1F		JSR FDIV	Z/(**** )
269	1EC3	A2	03			LDX =3	4 BYTE TRANSFER
270	1EC5	BD E8 1D			LD12	LDA MHLF,X
271	1EC8	95	04			STA X2,X	LOAD EXP/MANT2 WITH .5
272	1ECA	CA				DEX
273	1ECB	10	F8			BPL LD12
274	1ECD	20	50	1F		JSR FADD	+Z/(***)+.5
275	1ED0	38				SEC	ADD INT TO EXPONENT WITH CARRY SET
276	1ED1	A5	1C			LDA INT	TO MULTIPLY BY
277	1ED3	65	08			ADC X1	2**(INT+1)
278	1ED5	85	08			STA X1	RETURN RESULT TO EXPONENT

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 1EAD LFA LDA Z,X

Models: II

1EAD

LFA

LDA Z,X

STA X2,X

II specifications