Outvec, Urcvec, =Ubrkvc, =Uirqvc, Nmivec

0055	A659			PCLR	.BLOCK	1	;PROG CTR
0056	A65A			PCHR	.BLOCK	1
0057	A65B			SR	.BLOCK	1	;STACK
0058	A65C			FR	.BLOCK	1	;FLAGS
0059	A65D			AR	.BLOCK	1	;AREG
0060	A65E			XR	.BLOCK	1	;XREG
0061	A65F			YR	.BLOCK	1	;YREG
0062	A660			;
0063	A660			; I/O VECTORS		FOLLOW
0064	A660			;
0065	A660			INVEC	.BLOCK	3	;IN CHAR
0066	A663			OUTVEC	.BLOCK	3	;OUT CHAR
0067	A666			INSVEC	.BLOCK	3	;IN STATUS
0068	A669			URSVEC	.BLOCK	3	;UNRECOGNIZED SYNTAX VECTOR
0069	A66C			URCVEC	.BLOCK	3	;UNRECOGNIZED CMD/ERROR VECTOR
0070	A66F			SCNVEC .BLOCK		3	;SCAN ON-BOARD DISPLAY
0071	A672			;
0072	A672			; TRACE, INTERRUPT VECTORS
0073	A672			;
0074	A672			EXEVEC .BLOCK		2	; EXEC CMD ALTERNATE INVEC
0075	A674			TRCVEC .BLOCK		2	;TRACE
0076	A676			UBRKVC .BLOCK		2	;USER BRK AFTER MONITOR
0077	A678			UBRKV	=UBRKVC
0078	A678			UIRQVC	.BLOCK	2	;USER NON-BRK IRQ AFTER MONITOR
0079	A67A			UIRQV	=UIRQVC
0080	A67A			NMIVEC	.BLOCK	2	;NMI
0081	A67C			RSTVEC	.BLOCK	2	;RESET
0082	A67E			IRQVEC .BLOCK		2	;IRQ
0083	A680			;
0084	A680			;
0085	A680			;I/O REG DEFINITIONS
0086	A680			PADA	=$A400		;KEYBOARD/DISPLAY
0087	A680			PBDA	=$A402		;SERIAL I/O
0088	A680			OR3A	=$AC01		;WP, DBON, DBOFF
0089	A680			DDR3A	=OR3A+2		;DATA DIRECTION FOR SAME
0090	A680			OR1B	=$A000
0091	A680			DDR1B	=$A002
0092	A680			PCR1	=$A00C		; POR/TAPE REMOTE
0093	A680			;
0094	A680			; MONITOR MAINLINE
0095	A680			;
0096	8000				*=$8000
0097	8000	4C	7C 8B	MONITR JMP MONENT			;INIT S, CLD, GET ACCESS
0098	8003	20	FF 80	WARM	JSR GETCOM		;GET COMMAND + PARMS (0-3)
0099	8006	20	4A 81		JSR DISPAT		;DISPATCH CMD,PARMS TO EXEC BLKS
0100	8009	20	71 81		JSR ERMSG		;DISP ER MSG IF CARRY SET
0101	800C	4C	03 80		JMP WARM		;AND CONTINUE
0102	800F			;
0103	800F			; TRACE AND INTERRUPT ROUTINES
0104	800F			;
0105	800F	08		IRQBRK PHP			;IRQ OR BRK ?
0106	8010	48			PHA
0107	8011	8A			TXA
0108	8012	48			PHA
0109	8013	BA			TSX
0110	8014	BD 04 01			LDA $0104,X		;PICK UP FLAGS
0111	8017	29	10		AND #$10
0112	8019	F0	07		BEQ DETIRQ
0113	801B	68			PLA		;BRK
0114	801C	AA			TAX
0115	801D	68			PLA
0116	801E	28			PLP

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.

OUTVEC

URCVEC

=UBRKVC

=UIRQVC

NMIVEC

II specifications