Prndot LDA

2399	F036	68				PLA
2400	F037	60				RTS
2401	F038	A9	20		OUTPR	LDA	#' '	;FILL REST OF BUFF WITH BLANKS
2402	F03A E0 14				OUTPR1 CPX		#20	;SEE IF END OF BUFF
2403	F03C F0 06					BEQ	OUTPR2
2404	F03E 9D 60 A4					STA	IBUFM,X	;NO SO STORE BLANK
2405	F041	E8				INX		;INCR BUFF PNTR
2406	F042	10	F6			BPL	OUTPR1
2407	F044	60			OUTPR2 RTS
2408	F045
2409	F045				;SUB TO OUTPUT BUFFER,			70 DOTS (10 DOTS AT
2410	F045				;A TIME BY		7 ROWS) FOR	EACH LINE OF PRINTING
2411	F045	2C	11	A4	IPST	BIT	PRIFLG	;PRINT FLG ON ?
2412	F048	10	2E			BPL	IPO4
2413	F04A 20 CB F0				IPS0	JSR	PINT	;INITIALIZE VALUES
2414	F04D 20 E3 F0					JSR	IPSU	;SET UP FIRS OUTPUT PATTERN
2415	F050	A9	C1		IPO0	LDA	#PRST+SP12+MON ;TURN MOTOR ON
2416	F052	8D	0C	A8		STA	PCR
2417	F055	20	A0	FF		JSR	PAT23	;TIME OUT ?
2418	F058	D0	0C			BNE	IPO2	;NO, START SIGNAL RECEIVED
2419	F05A 20 A0 FF					JSR	PAT23	;YES, TRY AGAIN
2420	F05D D0 07					BNE	IPO2	;OK
2421	F05F 4C 79 F0					JMP PRIERR		;TWO TIME OUTS - ERROR
2422	F062	EA				NOP
2423	F063	EA				NOP
2424	F064	EA				NOP
2425	F065	EA				NOP
2426	F066	20	87	F0	IPO2	JSR PRNDOT		;STRB P1=1 PRINT DOTS (1.7MSEC)
2427	F069	20	87	F0		JSR PRNDOT		;STRB P2=1 PRINT DOTS (1.7MSEC)
2428	F06C				;CHECK FOR 90, WHEN 70			PRNDOT WILL OUTPUT ZEROS
2429	F06C AD 77 A4					LDA	IDOT
2430	F06F C9 5A					CMP	#90
2431	F071	90	F3			BCC	IPO2	;L.T. 90 THEN GO STROB P1
2432	F073	A9	E1		IPO3	LDA	#PRST+SP12+MOFF ;TURN MOTOR OFF
2433	F075	8D	0C	A8		STA	PCR
2434	F078	60			IPO4	RTS
2435	F079
2436	F079	20	44	EB	PRIERR JSR CLR			;CLEAR PRI PNTR
2437	F07C 20 B1 FE					JSR PATCH5		;TURN PRI OFF
2438	F07F A0 3B					LDY	#M12-M1
2439	F081	20	AF E7			JSR	KEP
2440	F084	4C	A1	E1		JMP COMIN		;BACK WHERE SUBR WAS CALLED
2441	F087
2442	F087				;SUBR TO INCR DOT COUNTER,WHEN
2443	F087				;NEG TRANS OUTPUT CHR FOR 1.7 MSEC
2444	F087				;CLEAR & SET UP NEXT PATTERN
2445	F087	A9	00		PRNDOT LDA		#0	;CLR INTERRPTS
2446	F089	8D	01	A8		STA	DRAH
2447	F08C AD 0D A8				PRDOT0 LDA		IFR
2448	F08F 29 02					AND	#MSP12	;ANY STROBES ?
2449	F091	F0	F9			BEQ	PRDOT0
2450	F093	AD 0C A8				LDA	PCR
2451	F096	49	01			EOR	#$01
2452	F098	8D	0C	A8		STA	PCR
2453	F09B EE 77 A4					INC	IDOT
2454	F09E AD 79 A4					LDA	IOUTU	;2 LEFT ELEM
2455	F0A1 0D 00 A8					ORA	DRB	;DO NOT TURN TTY OUTPUT OFF
2456	F0A4 8D 00 A8					STA	DRB
2457	F0A7 AD 78 A4					LDA	IOUTL	;7 RIGHT ELEM, CLR CA1 INTER FLG
2458	F0AA 8D 01 A8					STA	DRAH
2459	F0AD A9 A4					LDA	#PRTIME
2460	F0AF 8D 08 A8					STA	T2L

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 Prndot LDA

Models: II

CMP

EOR

ORA

II specifications