Blazin' Forth is an implementation of Forth for the Commodore 64, published in 1985 by Scott Ballantyne (for free). Its built-in editor is block- and line-based, and the editor is modeled after one described in the first edition of Starting Forth.
The rest of this post provides quick reference for the editor, because I couldn't find any such resource on the web. For a tutorial, see the Starting Forth PDF at the previous link.
Forth editor quick reference
Block selection/manipulation
Word
Stack
Description
LIST
(n --)
Select the given block, print it out, and start the editor
N
(--)
Move to the next block
B
(--)
Move backwards to the previous block
SAVE-BUFFERS
(--)
Save modified buffers back to disk blocks
EMPTY-BUFFERS
(--)
Discard buffers/changes
LOAD
(n --)
Load and execute the given block
Line editing commands
Word
Stack
Description
L
(--)
Print the currently selected block
T
(n --)
Select the given line number
P
(--)
Replace the selected line with the remainder of the input buffer (use 3 spaces to clear the line entirely; leave blank to copy from the insert buffer)
U
(--)
Insert under the current line the rest of the input buffer, shifting any following lines down, and move selection down one line
X
(--)
Cut the current line, and shift following lines up one line (the line that was removed is placed into the insert buffer--use P/U to "paste")
Character editing commands
Word
Description
F
Search for the rest of the input buffer in the current line
I
Insert the rest of the input buffer before the cursor
E
Delete the string previously found with F
D
Find and delete the rest of the input buffer (combination of F and E)
R
Replace previously found text with the rest of the input buffer (combination of E and I)
TILL
Delete everything from the cursor, through the rest of the input buffer
Miscellaneous commands
Word
Stack
Description
WIPE
(--)
Clear the current block
FLUSH
(--)
Save buffers back to disk blocks, and free associated buffers
COPY
(src dest --)
Copy block from one to another
S
(n --)
Search for the rest of the input buffer in this block and following blocks, while the block number is lower than the specified limit
M
(b l --)
Copy current line to a new block and associated line