friden

Verilog models of Friden calculators, simulated using Verilator

Updates:

• 8 July 2022: Added an EC-130 simulator with OpenGL support
• 6 July 2022: EC-132 and EC-130 (4 counter) models are tested and operational
• 30 June 2022: EC-130 (3 counter) model is tested and operational

Dependencies:

• verilator
• ncurses-dev (for terminal-based simulator)
• freeglut3-dev (for OpenGL-based simulator)

Screenshots:

Basic build instructions:

• Ensure Verilator is installed
• If you are building an OpenGL version, ensure FreeGLUT is installed
• Otherwise, ensure ncurses is installed
• Within the simulator you wish to build, type make notrace to make an interactive simulator without creating a trace file
• If you wish to create a trace file, type make trace

Other notes:

• The simulator may start in an odd state, as reset logic is not appropriately implemented. Simply press c to intialize the calculator.
• The EC-130 has predefined decimal point selector switch positions compared to the EC-132, which offers any decimal point position. This feature has been applied to the EC-130 simulators, but could easily be reconfigured for authenticity.
• The OpenGL versions do not have an indicator for overflow (yet).

Keyboard mappings:

Keyboard	EC-130	EC-132
q	[quit]	SQUARE ROOT
x	[n/a]	[quit]
0-9	0-9	0-9
.	DECIMAL POINT	DECIMAL POINT
enter	ENTER	ENTER
r	REPEAT	REPEAT
t	STORE	STORE
e	RECALL	RECALL
+	ADD	ADD
-	SUBTRACT	SUBTRACT
*	MULTIPLY	MULTIPLY
/	DIVIDE	DIVIDE
c	CLEAR ALL	CLEAR ALL1
backspace	CLEAR ENTRY	CLEAR ENTRY
d	[n/a]	CLEAR DISPLAY
o	OVERFLOW LOCK	OVERFLOW LOCK
s	CHANGE SIGN	CHANGE SIGN
up arrow	[decimal selector++]	[decimal selector++]
down arrow	[decimal selector--]	[decimal selector--]

Footnotes

1. This isn't a key on the EC-132, but is useful to initialize the calculator to a known state. ↩