Forth V1.4

History:

In the middle of the Eighties of the 20th century there were no affordable Forth computers for me. But I wanted to try this cool programming language urgently! So I had to write an interpreter myself... After an initial version on the Speccy I ported it to the ZX81.

Download:

forth_14.zip Archive with programs for ZX81, ZX Spectrum, and source, 7KB.

Screen snapshots:

Just the snapshot of the ZX Spectrum version. Just the snapshot of the ZX81 version.

Description:

Even thought it served its purpose, it has some errors. You are welcome to correct and to enhance it! Recognized words are:

:
defines a new word, no ";"
constant
defines a new constant
variable
defines a new variable
vlist
lists all words
forget
clears all new words
dup
duplicates the top of the stack
drop
removes the top of the stack
swap
exchanges the two numbers on top of the stack
over
duplicates the second number on top of the stack
rot
rotates the topmost three on the stack
c@
fetches a byte
@
fetches a number
!
stores a number
.
prints a number
if, else, then
conditionals
do, i, loop
loops
mod, /, *
modulus, division, multiplication
+, -
addition, subtraction
<, >, =
comparison

There is room for 15 new words, each of a maximum of 15 words in them.

Horizontal Bar.

Who to blame:

Back to my home page.

Comments and such stuff go to: bodowenzel@web.de