Verify MEM | Apple II guide

0737	8526	A0	00			LDY	#$00
0738	8528	91	FE			STA	($FE),Y
0739	852A	D1	FE			CMP	($FE),Y	;VERIFY MEM
0740	852C	F0	03			BEQ	NXTLOC
0741	852E	20	20	83		JSR	OUTQM	;TYPE ? AND CONTINUE
0742	8531	20	B2	82	NXTLOC JSR		INCCMP
0743	8534	18				CLC
0744	8535	90	E0			BCC	NEWLOC
0745	8537	F0	3E		NH42	BEQ	EXITM1
0746	8539	50	04			BVC	*+6
0747	853B	C9	3C			CMP	#'<'
0748	853D	F0	D8			BEQ	NEWLOC
0749	853F	C9	20			CMP	#$20	;SPACE ?
0750	8541	F0	EE			BEQ	NXTLOC
0751	8543	C9	3E			CMP	#'>'
0752	8545	F0	EA			BEQ	NXTLOC
0753	8547	C9	2B			CMP	#'+'
0754	8549	F0	10			BEQ	LOCP8
0755	854B	C9	3C			CMP	#'<'
0756	854D	F0	06			BEQ	PRVLOC
0757	854F	C9	2D			CMP	#'-'
0758	8551	F0	16			BEQ	LOCM8
0759	8553	38			DEPES	SEC
0760	8554	60				RTS
0761	8555	20	BE 82		PRVLOC JSR DECCMP			;BACK ONE BYT
0762	8558	18				CLC
0763	8559	90	BC			BCC	NEWLOC
0764	855B	A5	FE		LOCP8	LDA $FE		;GO FWD 8 BYTES
0765	855D	18				CLC
0766	855E	69	08			ADC	#$08
0767	8560	85	FE			STA	$FE
0768	8562	90	02			BCC	M42
0769	8564	E6	FF			INC	$FF
0770	8566	18			M42	CLC
0771	8567	90	AE			BCC	NEWLOC
0772	8569	A5	FE		LOCM8	LDA $FE		;GO BACKWD 8 BYTES
0773	856B	38				SEC
0774	856C	E9	08			SBC	#$08
0775	856E	85	FE			STA	$FE
0776	8570	B0	02			BCS	M43
0777	8572	C6	FF			DEC	$FF
0778	8574	18			M43	CLC
0779	8575	90	A0			BCC	NEWLOC
0780	8577	18			EXITM1 CLC
0781	8578	60				RTS
0782	8579	C9	47		GO1	CMP #'G'		;GO, 1 PARM (RTRN ADDR ON STK)
0783	857B	D0	19			BNE VER1		; ... PARM IS ADDR TO GO TO
0784	857D	20	4D	83		JSR	CRLF
0785	8580	20	9C	8B		JSR	NACCES	;WRITE PROT MONITR RAM
0786	8583	A2	FF			LDX #$FF		;PUSH RETURN ADDR
0787	8585	9A				TXS
0788	8586	A9	7F			LDA	#$7F
0789	8588	48				PHA
0790	8589	A9	FF			LDA	#$FF
0791	858B	48				PHA
0792	858C	AD 4B A6				LDA	P3H
0793	858F	48				PHA
0794	8590	AD 4A A6				LDA	P3L
0795	8593	4C	08	84		JMP	NR10
0796	8596	C9	56		VER1	CMP	#'V'	;VERIFY, 1 PARM (8 BYTES, CKSUM)
0797	8598	D0	1A			BNE	JUMP1
0798	859A	AD 4A A6				LDA	P3L

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.

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II specifications