STA Bash | Apple II guide

FBC7: 85 29	581		STA	BASH	;	BASH=000001CD
FBC9: 68	582		PLA		;	AND
FBCA: 29 18	583		AND	#$18	;	BASL=EABAB000
FBCC: 90 02	584		BCC	BSCLC2
FBCE: 69 7F	585		ADC	#$7F
FBD0: 85 28	586	BSCLC2	STA	BASL
FBD2: 0A	587		ASL
FBD3: 0A	588		ASL
FBD4: 05 28	589		ORA	BASL
FBD6: 85 28	590		STA	BASL
FBD8: 60	591		RTS
FBD9: C9 87	592	BELL1	CMP	#$87	;BELL CHAR? (CNTRL-G)
FBDB: D0 12	593		BNE	RTS2B	;	NO, RETURN
FBDD: A9 40	594		LDA	#$40	;DELAY .01 SECONDS
FBDF: 20 A8 FC	595		JSR	WAIT
FBE2: A0 C0	596		LDY	#$C0
FBE4: A9 0C	597	BELL2	LDA	#$0C	;TOGGLE SPEAKER AT
FBE6: 20 A8 FC	598		JSR	WAIT	;	1 KHZ FOR .1 SEC.
FBE9: AD 30 C0	599		LDA	SPKR
FBEC: 88	600		DEY
FBED: D0 F5	601		BNE	BELL2
FBEF: 60	602	RTS2B	RTS
FBF0: A4 24	603	STOADV	LDY	CH	;CURSOR H INDEX TO Y-REG
FBF2: 91 28	604		STA	(BASL),Y	;STORE CHAR IN LINE
FBF4: E6 24	605	ADVANCE	INC	CH	;INCREMENT CURSOR H INDEX
FBF6: A5 24	606		LDA	CH	;	(MOVE RIGHT)
FBF8: C5 21	607		CMP	WNDWDTH	;BEYOND WINDOW WIDTH?
FBFA: B0 66	608		BCS	CR	;	YES CR TO NEXT LINE
FBFC: 60	609	RTS3	RTS		;	NO,RETURN
FBFD: C9 A0	610	VIDOUT	CMP	#$A0	;CONTROL CHAR?
FBFF: B0 EF	611		BCS	STOADV	;	NO,OUTPUT IT.
FC01: A8	612		TAY		;INVERSE VIDEO?
FC02: 10 EC	613		BPL	STOADV	;	YES, OUTPUT IT.
FC04: C9 8D	614		CMP	#$8D	;CR?
FC06: F0 5A	615		BEQ	CR	;	YES.
FC08: C9 8A	616		CMP	#$8A	;LINE FEED?
FC0A: F0 5A	617		BEQ	LF	;	IF SO, DO IT.
FC0C: C9 88	618		CMP	#$88	;BACK SPACE? (CNTRL-H)
FC0E: D0 C9	619		BNE	BELL1	;	NO, CHECK FOR BELL.
FC10: C6 24	620	BS	DEC	CH	;DECREMENT CURSOR H INDEX
FC12: 10 E8	621		BPL	RTS3	;IF POS, OK. ELSE MOVE UP
FC14: A5 21	622		LDA	WNDWDTH	;SET CH TO WNDWDTH-1
FC16: 85 24	623		STA	CH
FC18: C6 24	624		DEC	CH	;(RIGHTMOST SCREEN POS)
FC1A: A5 22	625	UP	LDA	WNDTOP	;CURSOR V INDEX
FC1C: C5 25	626		CMP	CV
FC1E: B0 0B	627		BCS	RTS4	;IF TOP LINE THEN RETURN
FC20: C6 25	628		DEC	CV	;DEC CURSOR V-INDEX
FC22: A5 25	629	VTAB	LDA	CV	;GET CURSOR V-INDEX
FC24: 20 C1 FB	630	VTABZ	JSR	BASCALC	;GENERATE BASE ADR
FC27: 65 20	631		ADC	WNDLFT	;ADD WINDOW LEFT INDEX
FC29: 85 28	632		STA	BASL	;TO BASL
FC2B: 60	633	RTS4	RTS
FC2C: 49 C0	634	ESC1	EOR	#$C0	;ESC?
FC2E: F0 28	635		BEQ	HOME	;	IF SO, DO HOME AND CLEAR
FC30: 69 FD	636		ADC	#$FD	;ESC-A OR B CHECK
FC32: 90 C0	637		BCC	ADVANCE	;	A, ADVANCE
FC34: F0 DA	638		BEQ	BS	;	B, BACKSPACE
FC36: 69 FD	639		ADC	#$FD	;ESC-C OR D CHECK
FC38: 90 2C	640		BCC	LF	;	C, DOWN
FC3A: F0 DE	641		BEQ	UP	;	D, GO UP
FC3C: 69 FD	642		ADC	#$FD	;ESC-E OR F CHECK

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.

STA

BASH

EOR

II specifications