E5EA | Apple II instruction

0976	E5E9 60					RTS
0977	E5EA
0978	E5EA				;*** P COMMAND-ALTER PROCESSOR STATUS ***
0979	E5EA A2 00				CGPS	LDX #0
0980	E5EC F0 0E					BEQ CGALL
0981	E5EE
0982	E5EE				;*** A COMMAND-ALTER ACCUMULATOR ***
0983	E5EE A2 01				CGA	LDX #1
0984	E5F0 D0 0A					BNE CGALL
0985	E5F2
0986	E5F2				;*** X COMMAND-ALTER X REGISTER ***
0987	E5F2 A2 02				CGX	LDX #2
0988	E5F4 D0 06					BNE CGALL
0989	E5F6
0990	E5F6				;*** Y COMMAND-ALTER Y REGISTER ***
0991	E5F6 A2 03				CGY	LDX #3
0992	E5F8 D0 02					BNE CGALL
0993	E5FA
0994	E5FA				;*** S COMMAND-ALTER STACK POINTER ***
0995	E5FA A2 04				CGS	LDX #4
0996	E5FC 20 D8 E7				CGALL	JSR EQUAL	;PRINT PROMPT
0997	E5FF 20 5D EA					JSR RD2	;GET VALUE FROM KEYBOARD
0998	E602	B0	04			BCS GOERR
0999	E604	9D	20	A4		STA SAVPS,X
1000	E607	60				RTS
1001	E608	20	D4	E7	GOERR	JSR QM
1002	E60B D0 EF					BNE CGALL
1003	E60D
1004	E60D				;*** <SPACE> COMMAND-SHOW NEXT 5 MEMORY LOC ***
1005	E60D 20 3E E8				NXT5	JSR BLANK
1006	E610	A0	04			LDY #4	;UPDATE ADDR FROM
1007	E612	20	CD E2			JSR NXTADD	;<M>=XXXX
1008	E615	20	DB E2			JSR WRITAZ	;OUTPUT ADDRESS
1009	E618	4C	4D	E2		JMP MEIN	;DISPLAY CONTENTS OF NEXT 4 LOCS
1010	E61B
1011	E61B				;*** B COMMAND-SET BREAKPOINT ADDR ***
1012	E61B A0 27				BRKA	LDY #M8-M1	;PRINT "BRK"
1013	E61D 20 AF E7					JSR KEP
1014	E620	20	37	E8	BRK1	JSR PSL1	;PRINT "/"
1015	E623	20	73	E9		JSR REDOUT	;GET BREAK NUMBER
1016	E626	38				SEC
1017	E627	E9	30			SBC #'0'	;0 THRU 3
1018	E629	30	04			BMI BKERR	;CHARACTER < '0' -ILLEGAL
1019	E62B C9 04					CMP #4	;FOUR BRK POINTS
1020	E62D 30 05					BMI BKOK	;0 < CHARACTER < 4 -OK
1021	E62F 20 D4 E7				BKERR	JSR QM	;ERROR
1022	E632	D0	EC			BNE BRK1	;ALLOW REENTRY OF BREAK NUMBER
1023	E634	0A			BKOK	ASL A	;*2 TO FORM WORD OFFSET
1024	E635	48				PHA	;SAVE IT
1025	E636	20	AE EA			JSR ADDIN	;GET ADDRESS FOR BREAKPOINT
1026	E639	68				PLA
1027	E63A B0 10					BCS BKO2	;BAD ADDRESS ENTERED
1028	E63C 20 3D FF					JSR PATC18	;<CR> & CLR BUFFERS
1029	E63F AA					TAX	;# OF BRK
1030	E640	AD 1C A4				LDA ADDR	;STORE ENTERED ADDR IN BRKPT LIST
1031	E643	9D	00	01		STA BKS,X
1032	E646	AD 1D A4				LDA ADDR+1
1033	E649	9D	01	01		STA BKS+1,X
1034	E64C 60				BKO2	RTS	;ALL DONE
1035	E64D
1036	E64D				;*** ? COMMAND-SHOW CURRENT BREAKPOINTS ***
1037	E64D A0 00				SHOW	LDY #0

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.