more times signs; LaTeX blocking

Times sign is Ctrl+Shift+U D 7 Space in most apps on my PC other
than Markdown editor ReText (grumble grumble).  GTK vs. Qt issue?

Also escape multiple dollar signs on a line when they are sigils
for hexadecimal literals instead of a LaTeX formula delimiter.

Cite SnesLab for "Kankichi" sound driver name.

src/LCDC.md

@@ -12,7 +12,7 @@ Bit | Name                           | Usage notes
  5  | Window enable                  | 0=Off, 1=On
  4  | BG and Window tile data area   | 0=8800-97FF, 1=8000-8FFF
  3  | BG tile map area               | 0=9800-9BFF, 1=9C00-9FFF
- 2  | OBJ size                       | 0=8x8, 1=8x16
+ 2  | OBJ size                       | 0=8×8, 1=8×16
  1  | OBJ enable                     | 0=Off, 1=On
  0  | BG and Window enable/priority  | 0=Off, 1=On
 
@@ -79,6 +79,8 @@ if the bit is clear (0), the BG uses tilemap $9800, otherwise tilemap $9C00.
 This bit controls the size of all objects (1 tile or 2 stacked vertically).
 
 Be cautious when changing object size mid-frame.
+Changing from 8×8 to 8×16 pixels mid-frame within 8 scanlines of the bottom of an object
+causes the object's second tile to be visible for the rest of those 8 lines.
 If the size is changed during mode 2 or 3,
 remnants of objects in range could "leak" into the other tile and
 cause artifacts.

src/OAM.md

@@ -31,21 +31,21 @@ Y = Object's vertical position on the screen + 16. So for example:
 X = Object's horizontal position on the screen + 8. This works similarly
 to the examples above, except that the width of an object is always 8. An
 off-screen value (X=0 or X\>=168) hides the object, but the object still
-affects the priority ordering, thus other objects with lower priority may be
-left out due to the limit of ten objects per scanline.
+contributes to the limit of ten objects per scanline.
+This can cause objects later in OAM not to be drawn on that line.
 A better way to hide an object is to set its Y-coordinate off-screen.
 
 ## Byte 2 — Tile Index
 
-In 8x8 mode (LCDC bit 2 = 0), this byte specifies the object's only tile index ($00-$FF).
-This unsigned value selects a tile from the memory area at $8000-$8FFF.
+In 8×8 mode (LCDC bit 2 = 0), this byte specifies the object's only tile index (\$00-\$FF).
+This unsigned value selects a tile from the memory area at \$8000-\$8FFF.
 In CGB Mode this could be either in
 VRAM bank 0 or 1, depending on bit 3 of the following byte.
-In 8×16 mode (LCDC bit 2 = 1), the memory area at $8000-$8FFF is still interpreted
-as a series of 8x8 tiles, where every 2 tiles form an object. In this mode, this byte
+In 8×16 mode (LCDC bit 2 = 1), the memory area at \$8000-\$8FFF is still interpreted
+as a series of 8×8 tiles, where every 2 tiles form an object. In this mode, this byte
 specifies the index of the first (top) tile of the object. This is enforced by the
-hardware: the least significant bit of the tile index is ignored; that is, the top 8x8
-tile is "NN & $FE", and the bottom 8x8 tile is "NN | $01".
+hardware: the least significant bit of the tile index is ignored; that is, the top 8×8
+tile is "NN & \$FE", and the bottom 8×8 tile is "NN | \$01".
 
 ## Byte 3 — Attributes/Flags
 
@@ -91,7 +91,7 @@ limit, possibly causing another object later in OAM not
 to be drawn. To keep off-screen objects from affecting on-screen ones, make
 sure to set their Y coordinate to Y = 0 or Y ≥ 160
 (144 + 16).
-(Y&nbsp;≤&nbsp;8 also works if [object size](<#LCDC.2 — OBJ size>) is set to 8x8.)
+(Y&nbsp;≤&nbsp;8 also works if [object size](<#LCDC.2 — OBJ size>) is set to 8×8.)
 
 ### Drawing priority
 

src/SGB_Functions.md

@@ -73,9 +73,11 @@ the same display screen.
 Alongside normal Game Boy sound, a number of digital sound effects is
 pre-defined in the SNES BIOS, these effects may be accessed quite
 easily. Programmers whom are familiar with SNES sounds may also access
-the SNES sound chip, or use the SNES "Kankichi" sequencer engine
+the SNES sound chip, or use the SNES "[Kankichi]" sequencer engine
 directly in order to produce other sound effects or music.
 
+[Kankichi]: https://sneslab.net/wiki/N-SPC_Engine
+
 ## Taking Control of the SNES CPU
 
 Finally, it is possible to write program code or data into SNES memory,
@@ -89,7 +91,8 @@ Game Boy CPU, video controller, timers, and sound frequencies will be all
 operated approx 2.4% faster than handheld systems. Basically, this
 should be no problem, and the game will just run a little bit faster.
 However sensitive musicians may notice that sound frequencies are a bit
-too high, programs that support SGB functions may avoid this effect by
+too high, particularly in programs that use GB sound alongside Kankichi.
+Programs that support SGB functions may avoid this effect by
 reducing frequencies of Game Boy sounds when having detected SGB
 hardware. Also, "PAL version" SNES models which use a
 50Hz display refresh rate (rather than 60Hz) result in