Memerr JSR

1717	EB15 C8		INY
1718	EB16 B9 1C A4		LDA	ADDR,Y
1719	EB19 C8		INY
1720	EB1A 20 84 EA		JSR PACK		;PACK TWO CHRS INTO 1 BYTE
1721	EB1D B0 0C		BCS ADDN8		;BRCNH IF ERROR
1722	EB1F 9D 1C A4		STA	ADDR,X
1723	EB22 CA		DEX
1724	EB23 10 E8		BPL	ADDN7
1725	EB25 E8		INX		;X=0
1726	EB26 8E 1E A4		STX	CKSUM	;TO INDICATE WE GOT AN ADDR
1727	EB29 18		CLC		;NO INVALID CHARS
1728	EB2A 60		RTS
1729	EB2B 20 94 E3	ADDN8	JSR CKER00		;OUTPUT ERROR MSG
1730	EB2E 20 24 EA		JSR CRCK		;<CR>
1731	EB31 38		SEC		;SET CARRY FOR INVALID CHR
1732	EB32 60		RTS
1733	EB33
1734	EB33	;MEMORY FAIL TO WRITE MSG & SPECIFIC ADDRESS
1735	EB33 20 24 EA	MEMERR JSR		CRCK
1736	EB36 20 CD E2		JSR	NXTADD	;ADD Y TO ADDR+1,ADDR
1737	EB39 A0 31		LDY	#M11-M1	;PRINT "MEM FAIL"
1738	EB3B 20 AF E7		JSR	KEP	;FAIL MSG
1739	EB3E 20 DB E2		JSR	WRITAZ	;PRINT ADDR+1 , ADDR
1740	EB41 4C A1 E1		JMP	COMIN
1741	EB44
1742	EB44	;CLEAR DISPLAY & PRINTER POINTERS
1743	EB44 A9 00	CLR	LDA	#0
1744	EB46 8D 15 A4		STA	CURPO2	;DISP PNTR
1745	EB49 8D 16 A4		STA CURPOS		;PRINTR PNTR
1746	EB4C 60		RTS
1747	EB4D
1748	EB4D	;CLEAR CKSUM
1749	EB4D A9 00	CLRCK	LDA	#0
1750	EB4F 8D 1F A4		STA	CKSUM+1
1751	EB52 8D 1E A4		STA	CKSUM
1752	EB55 60		RTS
1753	EB56
1754	EB56	;CODE FOR PAGE ZERO SIMULATION
1755	EB56	;SUBR LDAY-SIMULATES LDA (N),Y INSTR WITHOUT PAG 0
1756	EB56	;BY PUTTING INDIR ADDR INTO RAM & THEN EXEC LDA NM,Y
1757	EB56 A9 25	PCLLD	LDA #SAVPC		;FOR DISASSEMBLER
1758	EB58 8C 2D A4	LDAY	STY CPIY+3		;SAVE Y
1759	EB5B A8		TAY
1760	EB5C B9 00 A4		LDA MONRAM,Y		;MONRAM=MONITOR RAM
1761	EB5F 8D 2B A4		STA	LDIY+1
1762	EB62 B9 01 A4		LDA	MONRAM+1,Y
1763	EB65 8D 2C A4		STA	LDIY+2
1764	EB68 AC 2D A4		LDY	CPIY+3	;REST Y
1765	EB6B A9 B9		LDA	#$B9	;INST FOR LDA NM,Y
1766	EB6D 8D 2A A4		STA	LDIY
1767	EB70 A9 60		LDA	#$60	;RTS
1768	EB72 8D 2D A4		STA	LDIY+3
1769	EB75 4C 2A A4		JMP LDIY		;START EXECUTING LDA (),Y
1770	EB78
1771	EB78	;SUBR STORE AT ADDR & CMP WITHOUT PAG 0
1772	EB78	;REPLACES STA (ADDR),Y			& CMP (ADDR),Y
1773	EB78	;LOOK THAT ADDR & ADDR+1 ARE NOT ON PAG 0
1774	EB78 48	SADDR	PHA
1775	EB79 AD 1C A4		LDA	ADDR
1776	EB7C 8D 28 A4		STA	STIY+1
1777	EB7F 8D 2B A4		STA	CPIY+1
1778	EB82 AD 1D A4		LDA	ADDR+1

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 Memerr JSR

Models: II

II specifications