Paste DFHMSD / DFHMDI / DFHMDF macros. Continuations and comments are accepted.

Visual designer for CICS Basic Mapping Support screens. Draw fields on a 3270 character grid, then export assembler macros that DFHMAPS can assemble.

• V Select and move   L Label   I Input   O Output   N Numeric   E Erase
• Drag a palette chip onto the 3270 grid. Keep dragging to set length, then drop. Drop cell = POS; span = LENGTH. Crossing the right edge wraps onto the next row.
• Drag a field to move it — it snaps to character cells. Drag the blue end-handle (or Shift+arrows) to change length, including multi-row wrap. Toolbar tools still rubber-band a field in place.
• Arrow keys nudge a selected field. Delete removes it.
• Double-click a field to edit INITIAL text.
• Import BMS loads existing map macros so you can continue development. Export BMS writes column-formatted source with continuation in column 72.
• Save a project JSON file to keep the visual layout between sessions. The generated source is always shown under the canvas.

Package the app with Docker for a local client install — see the repository README.