BNE Exitgk | Apple II instruction

1171	88B7	D0	13			BNE	EXITGK
1172	88B9	20	CF 88			JSR	GK
1173	88BC 8A					TXA
1174	88BD 0A					ASL	A
1175	88BE 0A					ASL	A
1176	88BF 0A					ASL	A
1177	88C0	0A				ASL	A
1178	88C1	8D	3E	A6		STA	SCRE
1179	88C4	20	CF 88			JSR	GK
1180	88C7	8A				TXA
1181	88C8	18				CLC
1182	88C9	6D	3E	A6		ADC	SCRE
1183	88CC 4C B8 81				EXITGK JMP		RESXAF
1184	88CF A9 00				GK	LDA	#0
1185	88D1	8D	55	A6		STA	KSHFL
1186	88D4	20	03	89	GK1	JSR	IJSCNV	;SCAN KB
1187	88D7	F0	FB			BEQ	GK1
1188	88D9	20	2C	89		JSR	LRNKEY	;WHAT KEY IS IT?
1189	88DC F0 F6					BEQ	GK1
1190	88DE 48					PHA
1191	88DF 8A					TXA
1192	88E0	48				PHA
1193	88E1	20	72	89		JSR	BEEP
1194	88E4	20	23	89	GK2	JSR	KEYQ
1195	88E7	D0	FB			BNE	GK2	;Z=1 IF KEY DOWN
1196	88E9	20	9B	89		JSR	NOBEEP	;DELAY (DEBOUNCE) W/O BEEP
1197	88EC 20 23 89					JSR	KEYQ
1198	88EF D0 F3					BNE	GK2
1199	88F1	68				PLA
1200	88F2	AA				TAX
1201	88F3	68				PLA
1202	88F4	C9	FF			CMP #$FF		;IF SHIFT, SET FLAG + GET NEXT KEY
1203	88F6	D0	07			BNE	EXITG
1204	88F8	A9	19			LDA	#$19
1205	88FA 8D 55 A6					STA	KSHFL
1206	88FD D0 D5					BNE	GK1
1207	88FF 60				EXITG	RTS
1208	8900	20	C1	89	HDOUT	JSR OUTDSP		;CHAR OUT, SCAN KB
1209	8903	6C	70	A6	IJSCNV JMP		(SCNVEC+1)
1210	8906	A9	09		SCAND	LDA	#$9	;SCAN DISPLAY FROM DISBUF
1211	8908	20	A5	89		JSR	CONFIG
1212	890B	A2	05			LDX	#5
1213	890D	A0	00		SC1	LDY	#0
1214	890F	BD 40 A6				LDA	DISBUF,X
1215	8912	8C	00	A4		STY	PADA
1216	8915	8E	02	A4		STX	PBDA
1217	8918	8D	00	A4		STA	PADA
1218	891B	A0	10			LDY	#$10
1219	891D	88			SC2	DEY
1220	891E	D0	FD			BNE	SC2
1221	8920	CA				DEX
1222	8921	10	EA			BPL	SC1
1223	8923	20	A3	89	KEYQ	JSR	KSCONF	; KEY DOWN ? (YES THEN Z=1)
1224	8926	AD 00 A4			H8926	LDA	PADA
1225	8929	49	7F			EOR	#$7F
1226	892B	60				RTS
1227	892C	29	3F		LRNKEY AND #$3F			;DETERMINE WHAT KEY IS DOWN
1228	892E	8D	3F	A6		STA	SCRF
1229	8931	A9	05			LDA	#$05
1230	8933	20	A5	89		JSR	CONFIG
1231	8936	AD 02 A4				LDA	PBDA
1232	8939	29	07			AND	#$07

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.

BNE

EXITGK

TXA

TXA

ADC

TXA

TAX

EOR

II specifications