OPCMP1 LDA, Brnchc JMP, Convrt LDA

3787	FCC3 D0 06		BNE	OPCOMP
3788	FCC5 20 94 E3	ERRORM JSR		CKER00	;OUTPUT ERROR MESSAGE
3789	FCC8 4C AA FB		JMP	STARTM
3790	FCCB
3791	FCCB	;COMPUTE FINAL OP CODE FOR DEFINED ADDRESING MODE
3792	FCCB BD E2 FA	OPCOMP LDA TYPTR1,X			;MATCH TYPE MASK WITH VALID MODE
3793	FCCE F0 05		BEQ OPCMP1		;PATTERNS & SKIP 1ST WORD TEST IF
3794	FCD0 2D 26 01		AND TMASK1		;ALREADY ZERO
3795	FCD3 D0 08		BNE	VALID
3796	FCD5 BD F1 FA	OPCMP1 LDA		TYPTR2,X	;TEST 2ND PART
3797	FCD8 2D 27 01		AND	TMASK2	;INST DOES NOT HAVE SPECIFIED MODE
3798	FCDB F0 E8		BEQ	ERRORM
3799	FCDD 18	VALID	CLC		;FORM FINAL OP CODE
3800	FCDE BD 00 FB		LDA	CORR,X
3801	FCE1 6D 34 A4		ADC	OPCODE
3802	FCE4 8D 34 A4		STA	OPCODE
3803	FCE7
3804	FCE7	;PROCESS ADRESSES TO FINAL FORMAT
3805	FCE7 BD 0F FB		LDA	SIZEM,X	;OBTAIN ADDRESS FORMAT FROM TABLE
3806	FCEA C9 00		CMP	#00
3807	FCEC F0 50		BEQ	ONEBYT
3808	FCEE C9 0F		CMP	#$0F	;NEED BRANCH COMPUTATION?
3809	FCF0 F0 1D		BEQ	BRNCHC
3810	FCF2 8D 33 A4		STA	TEMPA	;SAVE START POINT & CHAR COUNT
3811	FCF5 29 0F		AND	#$0F	;SEPARATE CHARACTER COUNT
3812	FCF7 A8		TAY		;LOAD ADDR BYTES INTO Y (0,1,OR 2)
3813	FCF8 8D 2F A4		STA	BYTESM	;SAVE IN BYTES
3814	FCFB EE 2F A4		INC	BYTESM	;TO INSTR LENGTH (1,2,OR 3 BYTES)
3815	FCFE AD 33 A4		LDA	TEMPA	;SEPARATE STARTING POINT
3816	FD01 29 F0		AND	#$F0
3817	FD03 4A		LSR	A
3818	FD04 4A		LSR	A
3819	FD05 4A		LSR	A
3820	FD06 4A		LSR	A
3821	FD07 AA		TAX		;AND PUT IT IN X
3822	FD08 20 12 FD		JSR	CONVRT	;CONVERT ASCII ADDRESS TO HEX
3823	FD0B B0 B8		BCS	ERRORM	;SKIP OUT IF ERROR IN INPUT
3824	FD0D 90 1D		BCC	STASH
3825	FD0F 4C 86 FD	BRNCHC JMP		BRCOMP
3826	FD12
3827	FD12	;############ SUBROUTINE ###############
3828	FD12	;CONVERT FORMATTED ADDRESS INTO PROPER HEX ADDRESS
3829	FD12 BD 33 01	CONVRT LDA		ADFLD,X	;PICK UP 1ST ADDRES CHARACTER
3830	FD15 20 7D EA		JSR	HEX	;CONVERT TO MOST SIG HEX
3831	FD18 B0 11		BCS	ERRFLG
3832	FD1A E8		INX		;GET NEXT ASCII CHARACTER
3833	FD1B BD 33 01		LDA	ADFLD,X
3834	FD1E E8		INX		;POINT TO NEXT CHARACTER, IF ANY
3835	FD1F 20 84 EA		JSR	PACK
3836	FD22 B0 07		BCS	ERRFLG
3837	FD24 99 34 A4		STA	OPCODE,Y	;SAVE IN MOST SIG. BYTE LOCATION
3838	FD27 88		DEY		;SET UP FOR NEXT ADDR BYTE, IF ANY
3839	FD28 D0 E8		BNE CONVRT		;IF NECESSARY, FORM NEXT ADDR BYTE
3840	FD2A 18		CLC
3841	FD2B 60	ERRFLG RTS			;NON HEX CLEARED CARRY
3842	FD2C	;#############
3843	FD2C
3844	FD2C AC 2F A4	STASH	LDY BYTESM		;SET UP TO STORE COMMAND
3845	FD2F 88		DEY
3846	FD30 B9 34 A4	STSHLP LDA		OPCODE,Y
3847	FD33 20 78 EB		JSR	SADDR	;STORE ONE BYTE OF COMMAND
3848	FD36 C0 00		CPY	#00

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 OPCMP1 LDA, Brnchc JMP, Convrt LDA

Models: II

OPCMP1 LDA

ADC

CMP

CMP

TAX

BRNCHC JMP

CONVRT LDA

II specifications