OUTD1A CPX, OUTD2A TXA, OUTDD1 PHA | Apple II specification

2275	EF17 E0 3C	OUTD1A CPX		#60	;LAST CHAR FOR DISP?
2276	EF19 90 05		BCC	OUTD2
2277	EF1B 20 AC EB		JSR PLXY		;GO BACK
2278	EF1E 68		PLA		;DO NOT STORE
2279	EF1F 60		RTS
2280	EF20 9D 38 A4	OUTD2	STA DIBUFF,X		;PUT CHAR IN BUFF
2281	EF23 EE 15 A4		INC CURPO2		;INC POINTER
2282	EF26 E0 14		CPX #20		;DISPLAY FULL?
2283	EF28 90 1E		BCC	OUTD4
2284	EF2A 20 2F EF		JSR	OUTD2A	;THIS WAY SCROLL IS A SUBR
2285	EF2D 30 47		BMI OUTD7		;EXIT DISP
2286	EF2F	;YES, SCROLL CHARS TO THE LEFT
2287	EF2F 8A	OUTD2A TXA			;X---> Y
2288	EF30 A8		TAY
2289	EF31 A2 13		LDX #19		;ADDR FOR DISP DO NOT
2290	EF33 8E 27 A4	OUTD3	STX STIY		;DECREM IN BINARY
2291	EF36 B9 38 A4		LDA DIBUFF,Y		;FROM BUFFER TO DISP
2292	EF39 09 80		ORA #$80		;NO CURSOR
2293	EF3B 20 7B EF		JSR OUTDD1		;CONVERT X INTO REAL ADDR
2294	EF3E 88		DEY
2295	EF3F CE 27 A4		DEC	STIY
2296	EF42 AE 27 A4		LDX	STIY
2297	EF45 10 EC		BPL OUTD3		;AGAIN UNTIL WHOLE DISP
2298	EF47 60		RTS
2299	EF48 48	OUTD4	PHA
2300	EF49 09 80		ORA #$80		;NO CURSOR
2301	EF4B 20 7B EF		JSR OUTDD1		;X=<$19 ,CONVRT TO REAL ADDR
2302	EF4E 68		PLA
2303	EF4F 29 80		AND #$80		;IF MSB=0 CLEAR REST OF DISPLAY
2304	EF51 D0 23		BNE	OUTD7
2305	EF53 AE 15 A4		LDX	CURPO2
2306	EF56	;CLEAR	DISP TO THE RIGHT
2307	EF56 E0 14	OUTD5	CPX	#20
2308	EF58 B0 1C		BCS	OUTD7
2309	EF5A 8E 27 A4		STX	STIY
2310	EF5D A9 A0		LDA	#' '+$80	;<SPACE>
2311	EF5F 20 7B EF		JSR	OUTDD1	;CONVRT TO REAL ADDR
2312	EF62 EE 27 A4		INC	STIY
2313	EF65 AE 27 A4		LDX	STIY
2314	EF68 D0 EC		BNE	OUTD5	;GO NEXT
2315	EF6A 4C 76 EF		JMP	OUTD7
2316	EF6D EA		NOP
2317	EF6E EA		NOP
2318	EF6F EA		NOP
2319	EF70 EA		NOP
2320	EF71 EA		NOP
2321	EF72 EA		NOP
2322	EF73 EA		NOP
2323	EF74 EA		NOP
2324	EF75 EA		NOP
2325	EF76 20 AC EB	OUTD7	JSR PLXY		;REST ,SO PRINTR INDEPEN
2326	EF79 68		PLA
2327	EF7A 60		RTS
2328	EF7B
2329	EF7B	;CONVERT X		INTO REAL ADDR FOR DISPLAY
2330	EF7B	;AND OUTPUT IT PB=DATA ; PA=W,CE ,A0 A1 (6520)
2331	EF7B 48	OUTDD1 PHA			;SAVE DATA
2332	EF7C 8A		TXA
2333	EF7D 48		PHA		;SAVE X
2334	EF7E 4A		LSR A		;DIVIDE X BY 4
2335	EF7F 4A		LSR A		;TO GET CHIP SELECT
2336	EF80 AA		TAX		;BACK TO 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 OUTD1A CPX, OUTD2A TXA, OUTDD1 PHA

Models: II

OUTD1A CPX

OUTD2A TXA

OUTDD1 PHA

TXA

TAX

II specifications