JMP CHN1 | Apple II manual

3318	F889	4C	7C	F8		JMP	CHN1
3319	F88C AD 29 A4				CHN2	LDA	STIY+2	;GET CHAR COUNT
3320	F88F 85 E9					STA	OLDLEN	;GET READY FOR REPLAC
3321	F891	AD 15 A4				LDA	CURPO2	;PNTR TO BEGINNING OF STRING
3322	F894	48				PHA		;SAVE IT
3323	F895	20	2A	F9		JSR	ADDA	;ADD TO NOWLN (LINE PNTR)
3324	F898	20	44	EB		JSR	CLR	;CLEAR DISP
3325	F89B A0 05					LDY	#M3-M1	;PRINT "TO"
3326	F89D 20 AF E7					JSR	KEP
3327	F8A0 A0 00					LDY	#0
3328	F8A2 20 7A F7					JSR IN02		;GET NEW STRING & REPLAC
3329	F8A5 68					PLA
3330	F8A6 AA					TAX
3331	F8A7 F0 06					BEQ	CHN4
3332	F8A9 20 1D F9				CHN3	JSR SUB		;RESTORE NOWLN WHERE IT WAS
3333	F8AC CA					DEX
3334	F8AD D0 FA					BNE	CHN3
3335	F8AF 4C 27 F7				CHN4	JMP PLNE		;DISPLAY THE CHANGED LINE
3336	F8B2
3337	F8B2				;THE FOLLOWING ARE SUBROUTINES USED BY COMMANDS
3338	F8B2 A9 01				CFLG	LDA	#1	;SET FLG FOR C COMMAND
3339	F8B4 D0 02					BNE	KI2
3340	F8B6 A9 00				KIFLG	LDA	#0	;CLR K OR I COMMAND FLG
3341	F8B8 8D 19 A4				KI2	STA	COUNT
3342	F8BB 60					RTS
3343	F8BC
3344	F8BC A5 E3				TOPNO	LDA TEXT		;SET CURRENT LINE TO TOP
3345	F8BE A6 E4					LDX	TEXT+1
3346	F8C0 85 DF				TPO1	STA	NOWLN
3347	F8C2 86 E0					STX	NOWLN+1
3348	F8C4 60					RTS
3349	F8C5
3350	F8C5 A5 E1				SETBOT LDA BOTLN			;SET CURRENT LINE TO BOTTOM
3351	F8C7 A6 E2					LDX	BOTLN+1
3352	F8C9 85 E7					STA	SAVE
3353	F8CB 86 E8					STX	SAVE+1
3354	F8CD 4C C0 F8					JMP	TPO1
3355	F8D0
3356	F8D0 AD 1C A4				RESNOW LDA ADDR			;RESTORE CURRENT LINE ADDRESS
3357	F8D3 85 DF					STA NOWLN
3358	F8D5 AD 1D A4					LDA ADDR+1
3359	F8D8 85 E0					STA NOWLN+1
3360	F8DA 60					RTS
3361	F8DB
3362	F8DB				; SEE IF CURRENT LINE AT TOP (C SET IF SO)
3363	F8DB A5 DF				ATTOP	LDA NOWLN
3364	F8DD C5 E3					CMP TEXT
3365	F8DF D0 16					BNE AT01
3366	F8E1 A5 E0					LDA NOWLN+1
3367	F8E3 C5 E4					CMP TEXT+1
3368	F8E5 D0 10					BNE AT01
3369	F8E7 38					SEC
3370	F8E8 60					RTS
3371	F8E9
3372	F8E9				; SEE IF CURRENT LINE AT BOTTOM (C SET IF SO)
3373	F8E9 A5 DF				ATBOT	LDA NOWLN
3374	F8EB A6 E0					LDX NOWLN+1
3375	F8ED C5 E1					CMP BOTLN
3376	F8EF D0 06					BNE AT01
3377	F8F1 E4 E2					CPX BOTLN+1
3378	F8F3 D0 02					BNE AT01
3379	F8F5 38				AT02	SEC

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 JMP CHN1

Models: II

JMP

CHN1

TAX

II specifications