STD2 | Apple II instruction

0861	8619				;
0862	8619	C9	10		STD2	CMP #$10	;STORE DOUBLE BYTE
0863	861B	D0	12			BNE MEM2
0864	861D	20	A7	82		JSR P3SCR
0865	8620	AD 4D A6				LDA P2H
0866	8623	A0	01			LDY #1
0867	8625	91	FE			STA ($FE),Y
0868	8627	88				DEY
0869	8628	AD 4C A6				LDA P2L
0870	862B	91	FE			STA ($FE),Y
0871	862D	18				CLC
0872	862E	60				RTS
0873	862F	C9	4D		MEM2	CMP #'M'	;CONTINUE MEM SEARCH W/OLD PTR
0874	8631	D0	09			BNE VER2
0875	8633	AD 4C A6				LDA P2L
0876	8636	8D	4E	A6		STA P1L
0877	8639	4C	08	88		JMP MEM3C
0878	863C	C9	56		VER2	CMP #'V'	;VERIFY MEM W/CHKSUMS , 2 PARM
0879	863E	D0	48			BNE L12B
0880	8640	20	9C	82		JSR P2SCR
0881	8643	20	2E	83		JSR ZERCK
0882	8646	20	16	83	VADDR	JSR CRLFSZ
0883	8649	A2	08			LDX #8
0884	864B	20	42	83	V2	JSR SPACE
0885	864E	A0	00			LDY #0
0886	8650	B1	FE			LDA ($FE),Y
0887	8652	20	DD 82			JSR CHKSAD
0888	8655	20	FA 82			JSR OUTBYT
0889	8658	20	B2	82		JSR INCCMP
0890	865B	70	11			BVS V1
0891	865D	F0	02			BEQ *+4
0892	865F	B0	0D			BCS V1
0893	8661	CA				DEX
0894	8662	D0	E7			BNE V2
0895	8664	20	25	83		JSR OCMCK
0896	8667	20	86	83		JSR INSTAT
0897	866A	90	DA			BCC VADDR
0898	866C	18				CLC
0899	866D	60				RTS
0900	866E	20	BE 82		V1	JSR DECCMP
0901	8671	E0	08			CPX #8
0902	8673	F0	03			BEQ *+5
0903	8675	E8				INX
0904	8676	10	F6			BPL V1
0905	8678	20	25	83		JSR OCMCK
0906	867B	20	4D	83		JSR CRLF
0907	867E	20	42	83		JSR SPACE
0908	8681	AE 37 A6				LDX SCR7
0909	8684	20	F4	82		JSR OUTXAH
0910	8687	60				RTS
0911	8688	C9	12		L12B	CMP #$12	;LOAD KIM FMT TAPE, 2 PARMS
0912	868A	D0	0C			BNE SP2B
0913	868C	AD 4C A6				LDA P2L
0914	868F	C9	FF			CMP #$FF	;ID MUST BE FF
0915	8691	D0	F4			BNE L12B-1	;ERR
0916	8693	A0	00			LDY #0	;MODE = HS
0917	8695	4C	E9	85		JMP L11D
0918	8698	C9	1C		SP2B	CMP #$1C	;SAVE PAPER TAPE, 2 PARMS
0919	869A	D0	75			BNE E2PARM
0920	869C	18				CLC
0921	869D	20	88	81		JSR SAVER
0922	86A0	20	9C	82		JSR P2SCR

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.