Update on the Assembly Language Help

[processoroverclocked@33mhz.com (Jon Bettencourt)]

Forget the previous thread on this (called "Hi Again. Another Machine
Language Mission" on csa2 and "Need Some Help..." on csa2p). I've got the
shell around everything, so I just need two routines (well, two and a
half):

One, called GETBMP, which takes an 8 by 8 square on the hires screen,
starting at coordinates in $FA (horizontal low), $FB (horizontal high),
and $FC (vertical), and puts it into eight byte bitmap data (bytes 1-4 at
$06-$09, bytes 5-8 at $3C-$3F), like this:

  +---+---+---+---+---+---+---+---+
  |   |   |XXX|XXX|XXX|XXX|   |   | Byte 1 (Location $06)
  +---+---+---+---+---+---+---+---+
  |   |XXX|   |   |   |   |XXX|   | Byte 2 (Location $07)
  +---+---+---+---+---+---+---+---+
  |   |XXX|   |   |   |   |XXX|   | Byte 3 (Location $08)
  +---+---+---+---+---+---+---+---+
  |   |XXX|XXX|XXX|XXX|XXX|XXX|   | Byte 4 (Location $09)
  +---+---+---+---+---+---+---+---+
  |   |XXX|   |   |   |   |XXX|   | Byte 5 (Location $3C)
  +---+---+---+---+---+---+---+---+
  |   |XXX|   |   |   |   |XXX|   | Byte 6 (Location $3D)
  +---+---+---+---+---+---+---+---+
  |   |XXX|   |   |   |   |XXX|   | Byte 7 (Location $3E)
  +---+---+---+---+---+---+---+---+
  |   |XXX|   |   |   |   |XXX|   | Byte 8 (Location $3F)
  +---+---+---+---+---+---+---+---+
    ^
    |
Most Significant Bit

Another one, called FINDBMP, which takes the bitmap data from GETBMP and,
starting at location $5000, ending at location $5FFF, and going in
increments of 8, sees if that bitmap data matches anything. If it does,
store the memory address where we found the match in $ED (low) and $EE
(high). If not, store the value $FFFF in $ED and $EE.

The half-routine is this: Take the number stored by FINDBMP, which is at
$ED and $EE. If it is $FFFF (the bitmap data wasn't found), don't bother
with it. Otherwise, subtract $5000 and divide by 8, thus returning the
bitmap's index (0 to 511, or -1 for not found). Let's call this MEMTOIDX.

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