[sdiy] Cheetah MS800 WAVE ROM craziness!

[Richie Burnett]

For those interested in a bit of vintage equipment "hacking" I've read both 
EPROMS from the Cheetah MS800 to raw binary files.  The 8Kbyte PROG one has 
6502 machine code in it.  The 32Kbyte WAVE EPROM is very strange though...

When loaded into Goldwave as 8-bit signed data the first part of it contains 
the MS800 wavetable waveform data in delta encoded format.  This delta 
encoding is mentioned in the M114S datasheet, (the chip that plays back the 
wave tables.)

Then there are some low-resolution *DRUM SAMPLES*, (cowbell, kick & snare!) 
also delta encoded.  For example, the snare drum sample sounds very TR-909 
like when integrated and played back at 8kHz sample-rate!

I can't recall ever hearing my MS800 produce any drum sounds, but I guess 
someone on the design team thought it was a good idea to put them in there 
for some future or un-documented purpose.

The samples are then followed by a load of weird ASCII text in the second 
half of the 32Kbyte address space.  Very strange considering the MS800 only 
has a 2-digit 7-segment LED display!  Some of the ASCII text follows...


   »O 3%1b00   6912  ine45w.del  ('sin45w')
$000d00   3328  rsine.del  ('rsine')
$000e00   3584  amsine.del  ('amsine')
$000f00   3840  amsine5w.del  ('amsine5w')
$001000   4096  squ20.del  ('squ20')
$001100   4352  noise.del  ('noise')
$001200   4608  ntri.del  ('ntri')
$001300   4864  chirp4.del  ('chirp4')
$001400   5120  chirp16.del  ('chirp16')
$001500   5376  part1w.del  ('part1w')
$001600   5632  part4w.del  ('part4w')
$001700   5888l    LVªJ–Oppó#Jª01¤O. LV 
ª®O¦ª\Q
¸OتüRrQrQªÿÿüR2ÿ

ºQp
 JT    »QfQQ p Š    p  ‰     ‰ QQY
  Š
 
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  NXºZ6Qÿ   Î           >  
     @  `@ ²RfQppÀ%µ
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~Q9 @ ` `@ `2üR  `òRR@ 
  `²ÿÿ 
        €  º  snared   ÿÿÿÿÿÿÿÿÿÿÿ
 
'   nare.del 
ÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ€ª€. 
²  Y üR6TSS S,S  C:\C\BIN\MAT2BIN.EXE -k24 chwave5.lst chwave5.rom pø 
COMSÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿÿ 
part3.del  ('part3')
$001d00   7424  part4.del  ('part4')
$001f00   7936  part5.del  ('part5x')
$002100   8448  part6.del  ('part6x')
$002300   8960  bass.del  ('bassd')
$002700   9984  snare.del  ('snared')
$002e80  11904  << end of last file loaded >>

End of list file found
  chirp4.del  ('chirp4')
$001400   5120  chirp16.del  ('chirp16')
$001500   5376  part1w.del  ('part1w')
$001600   5632  part4w.del  ('part4w')
$001700   5888  part1.del  ('part1')
$001900   6400  part2.del  ('part2')
$001b00   6912   sine.del
sine12w.del
saw.del
tri.del
squ50.del
delta.del
sine15w.del
sine17w.del
sine125w.del
sin1379w.del
sine179w.del
sine29w.del
sine45w.del
rsine.del
amsine.del
amsine5w.del
squ20.del
noise.del
ntri.del
chirp4.del
chirp16.del
part1w.del
part4w.del
part1.del
part2.del
part3.del
part4.del
part5.del
part6.del
bass.del
snare.del
art6.del
bass.del
snare.del

etc...


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