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SIDWAVE
Account closed
Registered: Apr 2002
Posts: 2238 |
Job for music player coder
this is an internal mail on the hvsc line, that i have to share with the scene, because i seek help with a legendary music editor:
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Hey,
This is mostly for active coder, ian coog, but maybe inge is reading ?
I always wanted to make a few tunes in electrosound, just never did..
I still have 10+ tunes from john stormont, that are not released, because the electrosound compiler throws away all the tempo changes/cia stuff, when it compiles a tune.
Michael Schwendt, the creator of sidplay, successfully patched the demotune with 6 parts from electrosound, to have all the tmepo changes in it, so it plays just as inside the editor.
But at that time, 1998 i think, it was very complicatged shit, and he was the only knowledable on this.
From what i remember, i only found inside the compiled music, a byte, that is counted down. say from 4 to 0, which gives a single tempo.
I dont know if there is CIA timing inside the electrsound editor itself, but it uses BPM. Just too bad, the compiler doesnt include this.
so perhaps, to solve this problem, instead to try and construct something advanced, if we resource the compiler, and read the player properly, we can be able to make a proper compiler, that includes all the tempo changes ?
i still dream.. i just wanna that fat sound of some choroid tunes, and the modern music programs dont have same kinda engine, so those VINTAGE sounds are almost impossible to recreate.
what you say ?
can we code a proper tune compiler for Electrosound ?
its pretty easy to make music in, especially if you know the tones or play a piano.
Thoughts and ideas please! |
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HCL
Registered: Feb 2003
Posts: 716 |
Interesting.. I suppose you'll have to start a compo to get anything done ;) |
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Mixer
Registered: Apr 2008
Posts: 422 |
Are the binaries for both the electrosound and tunes available somewhere?
Not promising anything, just would like to take a peek.(pun intended) |
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chatGPZ
Registered: Dec 2001
Posts: 11113 |
Quote:I suppose you'll have to start a compo to get anything done ;)
and maybe choose a target that isnt as "special" as electrosound =P |
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Hein
Registered: Apr 2004
Posts: 933 |
Sequence 11 of the demotune sounds different in Electrosound compared to Electrosound 64, PW modulation isn't the same.
I suppose to get a proper rip from Electrosound (or rather create a stand alone player for Electrosound project files) one has to shave of bits from Electrosound and try to isolate the internal player, instead of using a compiler that isn't 100%. |
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Mixer
Registered: Apr 2008
Posts: 422 |
As far as I can tell:
The electrosound menu and file operations are basic programs. Font from $2000->. screen at $0400.
The editor it self and play routine have code between $8000->8exx and $c000-$d000. Music note data is between $4000 and $7xxx. Other tables and stuff from $8exx->$9fff.
There are no CIA timer stuff, I did not find any writes to CIA registers from within the code, so it must use the default basic IRQ cycle as basis, then it just redirects $0314 vector to the play routine when it needs it and in the end jumps to $ea31.
The tempo routine reads the first value of each sequence to temporary register $02ad as the tempo in hex, editor part deciphers that to the screen as decimal.
Tempo of the tune in the editor appears to be achieved by a delay loop based on the $02ad. Loop has keyboardchecks embedded in it seems, apparently to keep editor responsive while playing.
I did not look at the compiler or compiled code yet. Seems that the delay loop stuff needs to be done as in the editor or translated to CIA stuff. Anyway, first number of a sequence seems to be the tempo, however it is to be used. |
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iAN CooG
Registered: May 2002
Posts: 3132 |
Interesting. $02ff is the byte that determines the tempo, or better, the delay between actual play calls, in the compiled electrosound sids. The byte at $02ad is actually read from data and set at play time, but completely ignored by the play routine. |
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iAN CooG
Registered: May 2002
Posts: 3132 |
/DEMOS/A-F/Electrosound.sid
is the only electrosound sid that manages $02ad changes and is probably the one SIDwave was talking above, with a play routine hacked by Michael.
Filetype: PSID Offset: 0x7c
Init: $0f90 Play: $0fa6
TITLE: Electrosound
AUTHOR: Steve Mellin
RELEASED: 1985 Orpheus
Filename: Electrosound.sid
Loading address: $0F90
init
0F90 20 18 15 JSR $1518
0F93 A9 01 LDA #$01
0F95 8D AB 02 STA $02AB
0F98 8D F9 02 STA $02F9
0F9B A9 08 LDA #$08 ; actual delay between play calls
0F9D 8D FF 02 STA $02FF
0FA0 A9 00 LDA #$00
0FA2 8D AD 0F STA $0FAC+1
0FA5 60 RTS
play
0FA6 20 65 1A JSR $1A65
0FA9 AD AD 02 LDA $02AD ; check if it's changed
0FAC C9 00 CMP #$00 ; if 02ad hasn't changed, get out
0FAE F0 1E BEQ $0FCE
0FB0 8D AD 0F STA $0FAC+1 ; remeber it
0FB3 A2 00 LDX #$00
0FB5 DD D0 0F CMP tempotable,X ; $02ad values
0FB8 F0 05 BEQ $0FBF
0FBA E8 INX
0FBB E0 08 CPX #$08
0FBD D0 F6 BNE $0FB5
0FBF 8A TXA
0FC0 0A ASL
0FC1 AA TAX
0FC2 BD E0 0F LDA CIAsettings,X ; associated CIA timing
0FC5 8D 05 DC STA $DC05
0FC8 BD E1 0F LDA CIAsettings+1,X
0FCB 8D 04 DC STA $DC04
0FCE 60 RTS
tempotable
0FD0 byte $B3
byte $C6
byte $D7
byte $C1
byte $CE
byte $EA
byte $ED
byte $E7
byte $B4
CIAsettings
0FE0 word $4510 ; now only needs to know what calc is needed to get these
word $37E3
word $2C1A
word $3B5B
word $3257
word $1EED
word $1CD9
word $2102
word $445E
it needs to check at runtime every value stored in $02ad and build the corresponding arrays. Knowing the calcs that lead to the CIA values, a generic 256 items array could be made. Will check it out later. |
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Mixer
Registered: Apr 2008
Posts: 422 |
this is the delay code from the editor.
sty ff
.C:8476 A0 00 LDY #$00
.C:8478 A2 00 LDX #$00
.C:847a E8 INX
.C:847b D0 FD BNE $847A
.C:847d 84 66 STY $66
.C:847f 20 10 85 JSR $8510 ; keyboard check
.C:8482 A4 66 LDY $66
.C:8484 88 DEY
.C:8485 CC AD 02 CPY $02AD
.C:8488 D0 EE BNE $8478
ldy ff
rts
.
Counts FF long loops down from FF to Tempo value.
It is called as part of the editor main loop. I don't know how BPM accurate the BPM can become with that sort of thinking :) |
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Mixer
Registered: Apr 2008
Posts: 422 |
Correct my thinking... CIA table is ($FF - Tempo) times N cycles?
N is the editor mainloop minimum + ( x-loop i.e. 5 cycles times 255) + keyboard check time + few overhead cycles for y loop. |
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Mixer
Registered: Apr 2008
Posts: 422 |
Not quite correct, at least michaels values do not work in linear fashion with my thinking. Oh well.. |
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