Inr, Bnc, Bnz, BM1, BNM1, Example SET R5, Load, Store

En	INR	Rn	(Increment)
Fn	DCR	Rn	(Decrement)
Non-register OPS-
00	RTN		(Return to 6502 mode)
01	BR	ea	(Branch always)
02	BNC	ea	(Branch if No Carry)
03	BC	ea	(Branch if Carry)
04	BP	ea	(Branch if Plus)
05	BM	ea	(Branch if Minus)
06	BZ	ea	(Branch if Zero)
07	BNZ	ea	(Branch if NonZero)
08	BM1	ea	(Branch if Minus 1)
09	BNM1	ea	(Branch if Not Minus 1)
0A	BK		(Break)
0B	RS		(Return from Subroutine)
0C	BS	ea	(Branch to Subroutine)
0D			(Unassigned)
0E			(Unassigned)
0F			(Unassigned)
Register Instructions:
----------------------
SET:
SET Rn,Constant		[ 1n Low High ]

The 2-byte constant is loaded into Rn (n=0 to F, Hex) and branch conditions set accordingly. The carry is cleared.

EXAMPLE:

15 34	A0	SET R5	$A034	;R5 now contains $A034
LOAD:
LD Rn			[ 2n ]

The ACC (R0) is loaded from Rn and branch conditions set according to the data transferred. The carry is cleared and contents of Rn are not disturbed.

EXAMPLE:

15	34	A0	SET	R5	$A034
25			LD	R5	;ACC now contains $A034
STORE:
ST Rn					[ 3n ]

The ACC is stored into Rn and branch conditions set according to the data transferred. The carry is cleared and the ACC contents are not disturbed.

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 Inr, Bnc, Bnz, BM1, BNM1, Example SET R5, Load, Store

Models: II

INR

DCR

RTN

BNC

BNZ

BM1

BNM1

SET:

EXAMPLE:

SET R5

LOAD:

EXAMPLE:

SET

STORE:

II specifications