SIGGRAPH 2010
July 27th, 2:00 pm, Theater 411
Greg James
Barry Silverman
Brian SilvermanThis project is an ongoing collaboration between Greg James, Barry Silverman, andBrian Silverman, began in the summer of 2009. We seek to preserve, document, andunderstand historic computer systems, and to present them in a highly visual manner for
education and inspiration.
We’re always looking for classic computer hardware in danger of being lost, especiallybroken or non-functional components created before about 1986. Before recycling or
tossing your old computers or game systems, please check our website to see if they
could become a valuable contribution to computer history.
www.visual6502.org
A presentation similar to this was given at SIGGRAPH 2010, July 27th 2:00 pm in the“Visualization for Art and Design” track chaired by Esther Lim. The theme for thisSIGGRAPH was “The People Behind the Pixels,” and this work is very much in honor of
the architects and visionaries who enabled our first pixels.
This specific presentation is distributed under the Creative Commons “Attribution-NonCommercialNoDerivs 3.0 Unported” (http://creativecommons.org/licenses/by-nc-nd/3.0/) license whereapplicable, with citation of 3rd party material, images, and governing licenses given. All un-citedmaterial and images are Copyright 2010, Greg James.

MOS Technology’s

6502 CPU
Released 1975
Apple I, II
Commodore PET, C64
Atari 2600 (6507)
Atari 400, 800
Nintendo NESApple II Plus motherboard

Paul Allen, Bill Gates

Steve Wozniak, Steve Jobs
Apple II

[Klein] CCL 1.3

Apple I

[Klein] CCL 1.3

Commodore PET

Jobs, Wozniak, and …

[Klein] CCL 1.3

Jobs, Wozniak, and …

The 6502[Klein] CCL 1.3

 Who’s seen a transistor?
 or a network of them doing work?
 Understand a CPU by seeing it operate Preservation
 Simulation, not emulation
 100% accurate model Honor the people behind my first pixels
 Their design achievements, hidden work.

 Began August 2009. Ongoing The Journey 1 Chip  Bitmaps  Polygons  CPU sim
 100% accurate working 6502 chip Visual tour as the chip computes

 A little surprise More than just the 6502

 1981. I was eight Atari 2600 game system Apple II+ 1981. I was eight Atari 2600 game system Apple II+ Before ~1980, chip design was a very

manual process[Volk’01] Used with permission

Wikimedia Commons, GFDL No digital representation

 Designs lost No computeroptimization
 Interesting
physical features[Volk’01] Used with permission 3510 transistors Designed by hand “undocumented” instructions – mystery!
 ~1/5 the price of its competition in 1975
MOS designers with Rubylith 6502
L to R:
Layout Designers:
Sydney-Anne Holt, Michael Jaynes,
Harry Bawcom.
Design Engineers:
Chuck Peedle, Ray Hirt, Rodney
Orgill, William Mensch, Wilbur Mathys.
Seated, Product Manager: Terry Holdt
EE Times, Aug 25, 1975, courtesy of W. Mensch Intel 4004 35th Anniversary Project http://www.4004.com

 Intel released the masks
 Masks make the chip
▪ Photolithography
 People transcribed the masks Intel 4004 Project, CCL1.3▪ Made schematics▪ Error prone▪ Relation of schematic to chip die is not obvious▪ Animated schematic, Fall 2009

Registers

Instruction Decode

ALU
Images by Brian Silverman, Barry Silverman, CCL1.2

Brian Silverman, Barry Silverman, CCL 1.2

 Model the physical parts
 Polygon model Easy to verify
 Intersect polygons  working chip

Squirts hot sulfuric acid (200º F)

These are still okafter we clean them up!

Nikon Optiphot 200
Nikon LV150
 5x, 10x, 20x objectives

X-Y translation stageto stitch many shots



Tip-Tilt stage forplanar focus

 72 images (8x9 shots) to cover the die Align to scope. Good planar objectives

Result:
6502D die shot
18,000 x 19,000 image
342 Mpix
Only need ~6000 x 5800
for what comes next…

 Demo Conductive Substrate Transistor-forming wires (polysilicon) Vias and buried contacts

 Metal Interconnects

 DemoPolygon model
began Nov. 11,
2009

Nov. 16,2009

Nov. 23,2009

Nov. 30,2009

Dec. 4,2009

Dec. 11,2009

Nov. 30,2009

Dec. 4,2009 Interactive 6502 chip simulation

 George Phillips, “Simplicity Betrayed”,

Communications of the ACM, Vol. 53 No. 6,
pages 52-58. Full text
 TRS-80 screen display

 Simple characters Byte in memory  character on screen

 Easy to approximate
 Extremely difficult to emulate accurately

 Complexity: Code, Data
More lines of code ormore complex code

Complexity

More polygons

CodeWork complete

Emulation

100%

Work complete

Simulation100% Verifying bytes is kinda dull
 The 6502 has friends

Atari 2600
game system

Atari 10444D, aka. TIA (Television Interface Adapter) Makes video signal
 Made my first pixels  Sprite engines. No framebuffer Framebuffers cost $60,000

 We know how it connects to the 6502

 Emulate program ROM and RAM
 Feeds the 6502 instructions

 Simulation code toggles the input clock That’s all. Just toggle 1 bit Read Color and Luminance at each clock2 frames of videofrom combined 6502
and Atari TIA
simulation
Shows h-blank, v-blank“Space Invaders” from combined 6502 and Atari TIA simulation, 7/23/2010http://stella.sourceforge.net

Pitfall, Activision 1982, generated from combined 6502 and Atari TIA simulation(I do own the cartridge ) It’s EASY to preserve historic hardware Parallelizable Guide for emulation
 Work from transistor-level simulation tocoarse fast simulation?
 Lots more to do!

 Free for non-commercial use
 www.visual6502.org
 I’m late – nothing up there yet =/ Check in a week or two Barry Silverman, Brian Silverman
 Jason and Irene Sutton. Gordon James Howard Marks. Steve Scott William Mensch, Jr.
 Anya Gershenzon
 Chris Twigg. Alex Suter www.6502.org archives
 … and all the people

behind our first pixels!
Output of our combined 6502 and TIA simulation

George Phillips, “Simplicity Betrayed,” Communicationsof the ACM, Vol. 53 No. 6, Pages 52-58



Andrew Volk, Peter Stoll, Paul Metrovich, "Recollectionsof Early Chip Development at Intel", Intel Technology
Journal Q1, 2001

Tim McNemey, Intel 4004 Project, http://www.4004.com

Erik Klein, http://www.vintage-computer.com

“Stella” Atari 2600 emulator. stella.sourceforge.net

Wikimedia Commons. www.wikipedia.org

Nikon Optiphot 200
5x, 10x, 50x, 100x objectives

Nikon LV150
5x, 10x, 20x objectives

 Motorola: 6800 – 6809 – 68000 – 68040

 MOS: 6502 – 6507 – 6510

 Intel: 4004 – 8008 – 8080 – 8085 - 8086 – 80186, x286
 Zilog: Z80 – Z8000 – Z80000 – Z380

 Motorola: 6800 – 6809 – 68000 – 68040
AmigaApple MacDefender

Altair 680

W. Mensch
C. Peddle, et. al.

 MOS: 6502 – 6507 – 6510
Commodore PET, C64
Apple I, II

Atari 2600, 400 / 800

Nintendo NESAsteroids

 Intel: 4004 – 8008 – 8080 – 8085 - 8086 – 80186, x286
Altair 8800

Space Invaders
F. Faggin
M. Shima

 Zilog: Z80 – Z8000 – Z80000 – Z380
TRS-80ColecoVision

Pac-Man, Galaga, Xevious, …

PCs….

 Start drawing: Nov. 11, 2009
 Finish drawing: Dec. 12, 2009
 Good startup in sim: Dec. 26, 2009 2nd gen sim, and verif.: through May 2010

 100% accurate 6502 in simulation
 Could make an actual chip No guesswork. Complete information
 Simple code
 Lots of polygons

 Intersect polygons to form: Transistors What they switch together
 Wires that drive transistors

 Input to full chip simulation engine

 Result: 100% accurate working chip Timing, cycle counts, ….

 Without having to know a thing about CPUinstructions
 Without having to transcribe specs

Apple I motherboard, 1977

Byte Magazine, 1977 [Klein] CCL 1.350x1800 shots to cover the chip :-(100x7200 shots to cover the chip x-)

 Released 1975
1961 – Steve Russel, MIT, first video game: Spacewars for PDP-11964 – First commercial graphics computer - IBM 2250 console, $125,000
1969 – Intel 1 kb RAM chip. Bell Labs first framebutter (3 bit)1971 – Intel 4004
1972 – Atari founded, Pong. Xerox PARC 8-bit framebuffer.
Intel 8008 8-bit processor
1973 – Triple I + Evans & Sutherland market first commercial framebuffer. Ethernet. Moore’s Law
1974 – Ed Catmull, Utah: Z-Buffer and texture mapping
Computer Graphics Lab at NYIT opensIntel 8080 - 2 mHz, 10x faster than 8008, $150
1975 – Frank Crow: antialiasing
Motorola 6800 selling for $175.
Wozniak discovers MOS 6502, selling for $25, finished Apple I by 1976
1977 – Apple incorporated. Apple II released in AprilTRS-80
1978 – DEC VAX 11/780 @ 5 mhz. 16 kb RAM chip $500. Commodore PET $595. TRS-80 for $600
1979 – Atari 400/800 8-bit computers. Motorola 68000 processor. IBM 3279 color terminal
1982 – Atari hits $2 billion in revenue, making it the fastest growing company in history
Source: http://sophia.javeriana.edu.co/~ochavarr/computer_graphics_history/historia