Magic Jewelry/RAM map

The following article is a RAM map for Magic Jewelry.

RAM Map

001A	Jewel removal blinking delay timer
0056	X-coordinate of falling column (0--5)
0057	Y-coordinate of falling column (0--12, the 13 visible rows)
0059	Fall delay timer (increments from 0 until it reaches value in $005B)
005B	Fall speed (the lower, the faster the drop)
005C	Current top jewel color
005D	Current middle jewel color
005E	Current bottom jewel color
005F	Next top jewel color
0060	Next middle jewel color
0061	Next bottom jewel color
006A	Moving bonus points X-coordinates
0087-008A	Level (each byte stores a decimal digit, reverse order, highest digit hidden)
0077-007E	Score (each byte stores a decimal digit, reverse order, highest digit hidden)
007F-0084	Jewelry Counter (each byte stores a decimal digit, reverse order, highest digit hidden)
0380	Playfield

Playfield

The playfield is a 15 row x 6 column grid. The top 2 rows are hidden (rows -2 and -1).

The playfield starts at $0380 and each row is represented by 8 bytes: 00 XX XX XX XX XX XX 00, where XX is a jewel color value.

The falling column spawns at row 0 and column 3 and it is drawn by modifying playfield memory as opposed to separate sprites. Those coordinates represent the bottom jewel of the column. The top and middle jewels are initially hidden in rows -2 and -1, respectively. The game ends if there is no space to spawn a new column or if the falling column locks such that its top and middle jewels are located in either of the hidden rows.

Jewel Colors

The following values are used for the playfield cells and for the current/next top/middle/bottom colors:

0 - empty cell

1 - red

2 - purple

3 - yellow

4 - orange

5 - blue

6 - green

7 - wild

Wilds appear as an X. They always spawn as a column of 3 wilds. And, if a wild column lands on the playfield floor, it vanishes. However, if it lands on a jewel, then all 3 wilds become the color of that jewel and subsequentially, all jewels of that color in the entire playfield vanish.