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Acornsoft FORTH

Filesystem

  • TAPE - Select cassette for storage.
  • DISK - Select floppy for storage.
  • CREATE-SCREENS - Rewrite floppy to crate screen files for storage. (Nddds to be DFS formatted first)
  • 3 LOAD - Load screen 3 (on tape it is the editor) and execute.
  • 30 LIST - Load screen 30 (if not loaded) and print its contents.
  • SAVE - Save current screen (lists and asks before saving).
  • SAVE-BUFFERS - Save all screens in memory to disk.
  • FLUSH - Zero all screens memory.
  • PROGRAM - Initializes empty screen (asks for number). Enters editor mode.
  • EDITOR - Enters editor mode.
--> - Load next screen.

Editor

Screen commands:

  • P - Put text onto line.
  • D - Delete the line, moving up the lower lines to close the gap, but hold the deleted line at PAD.
  • E - Erase the line, leaving it blank. The contents of the line are not saved.
  • H - Hold the contents of the line at PAD. The line also remains in the screen.
  • I - Insert the text from PAD at the specified line. The lower lines are moved down to make room for the insertion and line 15 is lost.
  • R - Replace the contents of the line with the text from PAD.
  • S - Spread the text by inserting a blank line. Line 15 is lost.
  • T - Type the contents of the line and also copy it to PAD. The text remains in the screen.

Line editing (each command also lieves given text in PAD):

  • C - Insert the given text at the current cursor position.
  • F - Find the given text and position the cursor immediately after its first occurrence.
  • TILL - Delete all text, from the current cursor position to the end of the text given. This command will only act on text within a single line of the screen.
  • X - Find and delete the first occurrence of the given text.
  • N - Find the next occurrence of the text at PAD
  • B - Move the cursor back by the number of characters in the text at PAD.
  • DELETE - (count --) Delete count characters, backwards from the current cursor position.
  • M - (count --) Move the cursor by count characters, either forwards or backwards depending on the sign of count. The text itself is unchanged M is a simple way of displaying the current cursor position!
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