AIM 65 Microcomputer Monitor Program Listing, E6AC

UT1LH	A007	UT2L	A008	UT2H	A009
USR	A00A	UACR	A00B	UPCR	A00C
UIFR	A00D	UIER	A00E	UDRA	A00F
UIN	0108	UOUT	010A	UP	F6F9
UPNO	F709	UP1	F713	UP4	F720
VECKSM	E694	VECK1	E69E	VECK2	E6AC
VALID	FCDD	VECK5	FF66	VECK4	FF6F
WRITAZ	E2DB	WRITAD	E2DD	WHEREI	E848
WHE1	E85C	WHE2	E868	WHE3	E870
WHEREO	E871	WHRO1	E885	WHRO2	E88E
WHRO3	E897	WHRO4	E89F	WHICHT	E8A8
WRAX	EA42	XORY	FDEF	XORYZ	FDF1
XORY1	FDFC	XORYRT	FE02	ZON	F25D
ZON1	F261	ZON2	F26C	ZPAGE	FC38
ZPY	FC50	ZPX	FC55

tasm: Number of errors = 0

AIM 65 MICROCOMPUTER MONITOR PROGRAM LISTING

Rockwell International

Document No. 29650 N36L

Rev. 1, April 1979

I used the Telemark Cross Assembler v3.1 (TASM) to re-create the source code. See http://www.halcyon.com/squakvly/

I tried to exactly duplicate the original source but some errors may exist. The exceptions are when the original had a hexadecimal constant instead

of an ASCII constant or ASCII equate (especially CR) in some immediate mode instructions; I changed them to ASCII constants or an equate.

For example, line 468 in the printed listing is:

0468	E185 A9	BC	STA1	LDA #$BC	;"<" CHR WITH MSB=1 FOR DISP
My version is:
0468	E185 A9	BC	STA1	LDA #'<'+$80	;"<" CHR WITH MSB=1 FOR DISP

The TASM assembler is not the same one that Rockwell used to write the code, so some assembler directives and opcode formats are different. However, the ASM file uses the same line numbering as the printed listing. That is, line 1000 in the printed listing corresponds to line 1000 in the ASM file and line 1000 in the LST file.

I could not fully read eight lines in the program listing because I was looking at a scanned copy, not the original. The rightmost characters were lost in the binding. These are the lines:

0149	HIST	=NAME		;FOUR LAST ADDR + NEXT (SINGL STEP)
1796		JSR	SWSTAK	;SWAP X ,	Y WITH RTRN ADDR FROM S
1804		JSR	SWSTAK	;SWAP X ,	Y WITH RTRN ADDR FROM
2159	RDBIT	LDA	TSPEED	;ARE WE IN C7 OR 5B,5A FREQUENC
2262	OUTDP1	JMP	(DILINK)	;HERE HE COULD ECHO		SOMEWHERE ELSE
3205		BNE	IN02	;CONTIN ,	DISP WONT	ALLOW > 60 CHR
3719		LDA	TYPE	;CHCK FOR	BRNCH WITH RELATIVE ADDR
3727	TRY34	LDA	#04	;CHECK FOR ABSOLUTE		OR ZP,X ORZP,

NOTE: I have since been told that the cut-off lines above exist in the original manual.

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 AIM 65 Microcomputer Monitor Program Listing, E6AC

Models: II

E6AC

AIM 65 MICROCOMPUTER MONITOR PROGRAM LISTING

II specifications