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p24eforth's Introduction

C port of the original P24 simulator by Dr. C. H. Ting/eMast Technology

So what I did is ..

I cleaned up most of the compiler code plus eForth kernel , which now fits nicely in a single well formatted forth source file which makes it easy to read and understand the compiler code.

Have fun , this design actually made it to outer space , the STEREO mission. :)

You will need gcc and gforth to run the simulator , you will find some issues with the eForth kernel since it's original code also had some issues , I left everything intact but will fix the kernel in future endeavours.

As for now , enjoy it as it is :)

p24eforth's People

Contributors

samawati avatar

Stargazers

C. Tarbide avatar Philip Zembrod avatar Dan Lee avatar Starring Forth avatar

Watchers

Alvaro Gomes Sobral Barcellos avatar

Forkers

uho jitsin2001

p24eforth's Issues

Some mismatch with "P24 MISC Microprocessor User's Manual" "STEREO-CIT-005.A"

From a quick look there is mismatch in the emulator against the instructions in ftp://mussel.srl.caltech.edu/pub/stereo/docs/p24manual.doc which (I hope) documents the P24 used in the STEREO mission,
specifically (Ch. 3. P24 Instructions Section 3.1 Instructions: p. 8):
0x06 get != TIMES Repeat instruction word if R is not 0. ...
0x07 put != RTI Return from interrupt
0x08 __ != RR8 Rotate right T by 8 bits.

Note that this does however match the Win32Forth code in Ch. 9. P24 Cycle-Based Simulator Section 9.3 Machine Instructions p. 60
NASA's version of the manual https://epact2.gsfc.nasa.gov/STEREO/cpu24_Manual_5_1.doc includes I/O instructions in the 0x2[0-F] range.

Adding a link to the STEREO-CIT-005.A document and any date or other history you have for the original source would be welcome.

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