BCC JD3 | Apple II guide

1162	E732	65	EA			ADC	LENGTH
1163	E734	8D	25	A4		STA	SAVPC
1164	E737	90	03			BCC	JD3
1165	E739	EE 26 A4				INC	SAVPC+1
1166	E73C 20 24 EA				JD3	JSR	CRCK	;<CR>
1167	E73F 4C 23 E7					JMP	JD1
1168	E742	60			JD4	RTS
1169	E743
1170	E743				;INITIALIZATION TABLE FOR 6522
1171	E743	340037FF25FFINTAB1 .DB					$34,$00,$37,$FF,$25,$FF,$25,$FF
1171	E749	25FF
1172	E74B FF FF 00 00					.DB	$FF,$FF,$00,T1I+T2I
1173	E74F E1 FF 7F					.DB	MOFF+PRST+SP12,$FF,$7F
1174	E752				;INITIALIZATION TABLE FOR 6532
1175	E752	FF FF 00 00 INTAB2 .DB					$FF,$FF,$00,$00
1176	E756				;INITIALIZATION TABLE FOR MONITOR RAM
1177	E756	7BE054E105EFINTAB3 .DW					NMIV3,IRQV3,OUTDIS
1178	E75C C70802CA0380					.DB	$C7,$08,$02,$CA,$03,$80,$00,$00
1178	E762	0000
1179	E764	00800D0D0000				.DB	$00,$80,$0D,$0D,$00,$00,$00
1179	E76A	00
1180	E76B				;SEE IF WE		HIT A SOFT BREAKPOINT (PART OF NMV3)
1181	E76B A2 07				CKB	LDX	#7	;COMPARE BRKPT LIST TO TRAP ADDR
1182	E76D BD 00 01				CKB2	LDA BKS,X		;GET ADDRESS OF NEXT BREAKPOINT
1183	E770	CA				DEX
1184	E771	CD 26 A4				CMP	SAVPC+1	;COMPARE TO SAVED PROGRAM COUNTER
1185	E774	D0	0A			BNE	CKB1
1186	E776	BD 00 01				LDA	BKS,X
1187	E779	CD 25 A4				CMP	SAVPC
1188	E77C D0 02					BNE	CKB1	;NO MATCH SO TRY NEXT BREAKPOINT
1189	E77E 38					SEC		;MATCH-SET MATCH FLAG
1190	E77F 60					RTS
1191	E780	CA			CKB1	DEX
1192	E781	10	EA			BPL CKB2		;MORE TO GO
1193	E783	18				CLC		;NO MATCH -RESET MATCH FLAG
1194	E784	60				RTS
1195	E785
1196	E785				;GET # OF LINES COUNT FOR GO-COMMAND,LIST-COMM
1197	E785	20	5D	EA	GCNT	JSR	RD2
1198	E788	90	02			BCC	GCN1
1199	E78A 49 0C					EOR	#$0C	;<SPACE>---> $2C ,<CR>---> $01
1200	E78C 8D 19 A4				GCN1	STA	COUNT
1201	E78F 60					RTS
1202	E790
1203	E790				;CHECK IF COUNT HAS REACHED ZERO
1204	E790				;COUNT=$2C		MEANS FOREVER
1205	E790	AD 19 A4			DONE	LDA	COUNT	;IF COUNT=0 WE ARE DONE
1206	E793	C9	2C			CMP	#$2C	;THIS MEANS FOR EVER
1207	E795	F0	09			BEQ	DON1	;SET ACC DIFF FROM ZERO
1208	E797	F8				SED		;DECREMENT COUNT IN DECIMAL
1209	E798	38				SEC
1210	E799	E9	01			SBC	#1
1211	E79B D8					CLD
1212	E79C 8D 19 A4					STA	COUNT
1213	E79F 60					RTS
1214	E7A0 A9 2C				DON1	LDA	#$2C
1215	E7A2 60					RTS
1216	E7A3
1217	E7A3 A0 00				FROM	LDY	#0	;PRINT "FR="
1218	E7A5 F0 02					BEQ	TO1
1219	E7A7
1220	E7A7 A0 05				TO	LDY #M3-M1		;PRINT "TO="

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.

ADC

BCC

JD3

;INITIALIZATION TABLE FOR 6522

7BE054E105EFINTAB3 .DW

NMIV3,IRQV3,OUTDIS

CMP

CMP

EOR

CMP

II specifications