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Forth word list
Notes for use
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NOTES FOR USE OF THE WORD LIST

These words are used for programming the TDS2020F and incorporate the latest ANS Forth. There are 509 words in all, contained either in the TDS2020F Forth ROM or in one of two files, #ANS.TDS (ANS Forth words) or #EXTEND.TDS (non-ANS words specific to the TDS2020F). All the words are listed in alphabetical and dictionary orders below, followed by individual definitions.

Word definitions are given in strict ASCII order. In this section, 'ANS' appears alongside all ANS Forth words. Where words are found in the separate files, this is also shown. The stack conditions for each word before and after are shown thus:

 

stack before - stack after

 

The top of the stack is on the right. Where the stack effect is different during compilation and run-time, both are given.

When the return stack changes it is indicated like this:

 

R:   n1 n2 - n1 n3

 

If text is needed following the word in question it is given in single quotes like this:

 

'<spaces>name' -

 

In this example, from the definition of ['] , there are no stack effects but text consisting of at least one space, then a name, then one space is required after the word, like this: ['] XYZ

STACK EFFECT ABBREVIATIONS

Symbol

Data type

+d

non-negative 32-bit double-cell number

+n

non-negative 16-bit single-cell number

?1 ?2

any data type. May be an undetermined number

 

of stack entries of unspecified type

a or  addr

address

aa or  a-addr

aligned address

b

16-bit number of which only the lower byte is

 

of interest

c or  char

ASCII character

ca  or  c-addr

character-aligned address

case-sys

CASE structures

ccc

ASCII text

colon-sys

definition compilation

d

32-bit signed double-cell number (two's complement)

dest

control-flow destinations

do-sys

do-loop structures

eol

end of line character (hex 0D)

false

false flag (0)

flag

Boolean flag. 0 = false, non-zero = true,

 

flag = -1 when true flag left by a word

lfa

link field address

loop-sys

loop-control parameters

n

16-bit signed single-cell number

nest-sys

definition calls

nfa

name field address

of-sys

OF structures

orig

control-flow origins

pfa

parameter field address (body of a definition)

r/l

right/left flag (for LCDs)

s/c

shift cursor flag (for LCDs)

true

true flag (-1)

u

16-bit unsigned single-cell number

ud

32-bit unsigned double-cell number

x

unspecified cell

xd

unspecified cell pair

xt

execution token (code field address, cfa)

wid

word list identifier

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