techref - Hardware

Massmind Hardware Emulation

In particular, there are many programs to make a computer pretend to be:

another computer, at more-or-less full speed, including sound and video ("emulator") so we can play "classic" dusty old games
another computer, at slower speed -- or even paused -- ("CPU simulator") so we can debug a program, looking at all the various registers that are practically impossible to access on the real thing.
a collection of digital logic gates ("digital logic simulator"), so we can design an entire CPU or other digital design -- with the ability to "undo" and quickly make copies of the design, before we build the thing out of discrete TTL or FPGA or ASIC.
a collection of resistors, capacitors, transistors, etc ("circuit simulator") so we can design a logic gate or audio filter or other analog design -- with the ability to "undo" and analyze the effect of max/min component tolerances, before we build the thing out of discrete transistors or ASIC.
many other things ... (suggestions ?)

CHAC History Pages has Apple Macintosh simulators, Apple II simulators, Atari simulators, Beboputer simulator, etc.
http://www.schorn.ch/cpm/intro.html Altair 8800 simulator. Choice of 8080 or Z80 CPU. CP/M versions. Many languages.
http://sourceforge.net/projects/winston/ WinSTon - WinSTon is an Atari ST emulator running under Windows. Many programs and games are emulated very well but especially demos still behave strangely. Our goal is the "perfect" emulator.

(What is this ?) /techref/ubicom/interpret.htm
PIC Microcontroller simulators microchip/simulators.htm
BS1 simulator from Al Williams /techref/member/aw-awc-o86/index.htm
Ubicom SX simulators ubicom/simulators.htm
TI MSP430 Microcontroller simulators (?) /techref/ti/index.htm
DjLCDSIM: Dincer's JavaScript LCD Simulator io/lcd/djlcdsim/djlcdsim.html DjLCDSIM is script simulating a 2*16 character type LCD with a HD44780 controller.

for simulating digital logic gates /techref/logic/family.htm

"Simulation of Simple Digital Logic through a Computer-Aided Design System" by Robert McDermott, Byte magazine, January 1983 pg 396
Bit Manipulation Simulator A simple learning tool for C langauge (and general) logical operators.
LogicSim: Digital Logic Simulator LogicSim basic, Java, can be embedded in web pages.
http://sourceforge.net/projects/circuit/ Logisim advanced, Java.
http://ozark.hendrix.edu/~burch/logisim/ authors page.

Spice and Pspice ...
https://hackaday.com/2020/01/08/commercial-circuit-simulator-goes-free/
some gotchas when using circuit simulators: /techref/spicegotcha.htm
analog filters /techref/uk/ac/york/cs/www-users/http/~fisher/lcfilter/index.htm
http://mark.madscientist.ws/cgi-bin/circuits.cgi A really cool online simulator / circuit editor for simple circuits that really does a great job of showing how Voltage Resistance and Current interact in a circuit.
http://www.falstad.com/circuit/ Really nice Java circuit simulator. Graphically shows the flow of electrons through the circuit. Source code and object code available. circuit.jar^ can be run as an applet in a page and circuits loaded from /circuits/file.txt files under the main folder. E.g. http://www.falstad.com/circuit/e-cap.html loads the capacitor circuit from http://www.falstad.com/circuit/circuits/cap.txt
The "hidden" requirement is that there MUST be a file called setuplist.txt^ in the same folder as the circuit.jar file.
Used on this site to simulate some circuits including the Linistepper drive circuit. An IFRAME was used to a minimal page outside the techref folder since .txt files in that folder are re-processed to HTML when served.
http://www.jdm.homepage.dk/simul.htm Using Turbo Pascal as a hardware simulator

for simulating resistors and transistors /techref/transistors.htm and etc.