Write Edge Detect Control not Used Because KB

0181	A484	; WRITE EDGE			DETECT CONTROL (NOT USED BECAUSE KB)
0182	A484			*=$A484
0183	A484	DNPA7		.BLOCK	1	;DISABLE PA7 INT ,NEG EDGE DET
0184	A485	DPPA7		.BLOCK	1	;DIS PA7 INT ,POS EDGE DETE
0185	A486	ENPA7		.BLOCK	1	;ENA PA7 INT ,NEG EDG DET
0186	A487	EPPA7		.BLOCK	1	;ENA PA7 INT ,POS EDG DET
0187	A488
0188	A488	;		READ AND CLEAR INTERRUPT
0189	A485			*=$A485
0190	A485	RINT		.BLOCK	1	;BIT 7=TIMER FLG , BIT 6=PA7 FLG
0191	A486
0192	A486	;			TIMER INTERRUPT
0193	A494			*=$A494
0194	A494	;WRITE COUNT TO INTERVAL TIMER
0195	A494	;INTERRUPT DISABLE FOR THESE ADDRS
0196	A494	DIV1		.BLOCK	1	;DIV BY 1 (DISABLE);ADD 8 TO ENA
0197	A495	DIV8		.BLOCK	1	;DIV BY 8 (DIS) ; ADD 8 TO ENA
0198	A496	DIV64		.BLOCK	1	;DIV BY 64 (DIS) ; ADD 8 TO ENA
0199	A497	DI1024 .BLOCK			1	;DIV BY 1024 (DIS) ; ADD 8 TO ENA
0200	A498
0201	A498	;	*********************************************
0202	A498	;	*	6522		ADDRESSES (MONIT) (A800-ABFF)		*
0203	A498	;	*********************************************
0204	A800			*=$A800
0205	A800	DRB		.BLOCK	1	;DATA REG B
0206	A801	DRAH		.BLOCK	1	;DATA REG A
0207	A802	DDRB		.BLOCK	1	;DATA DIR REG B
0208	A803	DDRA		.BLOCK	1	;DATA DIR REG A
0209	A804	T1L		.BLOCK	1	;TIMER 1 COUNTER LOW
0210	A805	T1CH		.BLOCK	1	;TIMER 1 COUNTER HIGH
0211	A806	T1LL		.BLOCK	1	;TIMER 1 LATCH LOW
0212	A807	T1LH		.BLOCK	1	;TIMER 1 LATCH HIGH
0213	A808	T2L		.BLOCK	1	;TIMER 2 LATCH & COUNTER LOW
0214	A809	T2H		.BLOCK	1	;TIMER 2 COUNTER HIGH
0215	A80A	SR		.BLOCK	1	;SHIFT REGISTER
0216	A80B	ACR		.BLOCK	1	;AUX CONTROL REGISTER
0217	A80C	PCR		.BLOCK	1	;PERIPHERAL CONTROL REGISTER
0218	A80D	IFR		.BLOCK	1	;INTERRUPT FLAG REGISTER
0219	A80E	IER		.BLOCK	1	;INTERRUPT ENABLE REGISTER
0220	A80F	DRA		.BLOCK	1	;DATA REGISTER A
0221	A810
0222	A810	;DEFINE I/O CONTROL FOR PCR (CA1,CA2,CB1,CB2)
0223	A810	DATIN		=$0E		;DATA IN CA2=1
0224	A810	DATOUT		=$0C		;DATA OUT CA2=0
0225	A810	PRST		=$00		;PRINT START (CB1) ,NEG DETEC
0226	A810	SP12		=$01		;STROBE P1,P2	(CA1) ,POS DETEC
0227	A810	MON		=$C0		;MOTOR ON (CB2=0)
0228	A810	MOFF		=$E0
0229	A810	;MSKS TO OBTAIN EACH INTERRUPT
0230	A810	MPRST		=$10		;INT FLG FOR CB1
0231	A810	MSP12		=$02		;INT FLG FOR CA1
0232	A810	MT2		=$20		;INT FLG FOR T2
0233	A810
0234	A810	;DEFINE I/O CONTROL FOR ACR (TIMERS,SR)
0235	A810	PRTIME =1700				; PRINTING TIME =1.7M MSEC
0236	A810	DEBTIM =5000				; DEBOUNCE TIME (5 MSEC)
0237	A810	T2I		=$00		;T2 AS ONE SHOT (PRI,KB,TTY,TAPE)
0238	A810	T1I		=$00		;T1 AS ONE SHOT,PB7 DIS (TAPES)
0239	A810	T1FR		=$C0		;T1 IN FREE RUNNING (TAPE)
0240	A810
0241	A810	;		******************************
0242	A810	;		*		DISPLAY (AC00-AFFF)	*

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 Write Edge Detect Control not Used Because KB

Models: II

; WRITE EDGE

DETECT CONTROL (NOT USED BECAUSE KB)

II specifications