Conference napalm::commusic_v1

    I guess we must be a dying breed. It would be really interesting
    to hear how and what you do with your CX5. I suspect we could exchange
    one or two patches and techniques etc. Perhaps we ought to carry
    this conversation on VIA VAXMAIL. 
    
    					PAUL KENT (PK).

    Make that three.  I have A CX5M but I have not done much with it.
    I don't have the loads of keyboard talent that everyone else in this
    file seems to. (That's why I got a music computer instead of a regular
    synth)  I have been writing a Z80 disassembler to try and find out
    how to get to the midi port and keyboard form basic or Z80 code.
    I think the best chance is to go through the music BIOS in the synth
    ROM. (Hence the Z80 disassembler)  I don't think there is much interest
    in the CX5M in this file judging by the response to the original
    CX5M note that I posted in here (80.0) way back when.
    
    						MJC

    I can't help but think that you 2 haven.t got much use out of your
    CX5's due to the poor Yamaha software.  Using the local (non YAMAHA)
    software I can use mine as a reasonably good multitrack sequencer
    as well as a multi-tymbral synth all at the same time, and I can't
    play chopsticks on a piano.
    
    RE.-1 I would be interested in how you get on in polling the MIDI
    port. 
    
    				PAUL.
    

    
    
    I seem to have lost the original topic forthos of you who aske for
    this this however it seems
    relevant here and and I found the time to post it so here goes.
    
    This is an extract from "FEEDBACK" the official magazine of the
    YAMAHA "X" series owners group.
                 
    	Quote -------
    
    
    This program is a simple routine to send MIDI codes from the SFG MIDI
    out socket. This version will only run on CX5M Mk1. The program
    addresses the SFG module and therefore will not run unless the module
    is connected.                                      
    
    10	CLEAR 200,& HDE00
    20  DATA 3E,0C,D3,A8,3E,65,32,F6,7F,3A,00,DE,32,F5,7F,3E,00,D3,A8,C9
    30	FOR Z=1 TO 20
    40	READ D$
    50  POKE & HDE00+Z,VAL("CH"+D$)
    60	NEXT Z
    70	DEFUSR=HDE01
    80	INPUT D$
    90	POKE & HDE00,VAL("&H"+D$)
    100	A=USR(A)
    110	GOTO 80
    120 END                
              
    In response to the ? enter a single byte HEX data followed by return.
    The entered data is then sent across midi. We hope to print future
    updates to this program in future magazines.
    
    Unqoute	-
    
    Can any Z80 officionados tell me what this program is doing?
    I take no responsibility for the performance of this program I haven't
    tried it myself. However I would aprreciate hearing how you get
    on with it.
    
    
    				Paul.

    Paul,
	I took a stab at the program you left in here and it will work 
    with a couple of corrections to typos.  IN line 50 change the "CH"
    to "&H" and in line 70 should be:

	70  DEFUSR=&HDE01

	As you may know, the bytes in line 20 are machine code that is
    executed as a user routine defined in line 70 and called in line 100.
    This machine code is stored in RAM addresses DE01 through DE14.  The 
    single byte that you want to send out of MIDI port is stored in RAM
    location DE00.  The z80 machine code breaks down as follows:

	3E0C	Load 0C into accumulator

	D3A8    Output accumulator to I/O port address A8
		(This is port A of the Intel-8255 Programmable Peripheral
		interface..not sure what 0C tells the PPI to do)

	3E65	Load 65 into accumulator

	32F67F	Store accumulator (now 65) into RAM loc 7FF6

	3A00DE	Load the byte the user entered which is now stored at RAM
		location DE00 into the accumulator.
	
	32F57F	Store accumulator into RAM location 7FF5

	3E00	Load 00 into accumulator

	D3A8	Output accumulator to I/O port address A8 (To PPI port A)

	C9	RETURN

    In Appendix F of my MSX BASIC reference manual, there is a minute
    amount of information pertaining to the 8255 PPI addresses (ie 'A8'
    being port A address).  The PPI must use those bytes stored at 7FF5
    and 7FF6 somwhow after 00 is output to the port address A8.  If
    I get a chance I will get a copy of the 8255 data sheet and find
    out what it is all about.  I used to work with them but I can't
    remember ALL of the microcode!  Maybe if I get really hooked on
    this, I will send away for any CX5M technical info (schematics,
    memory maps etc) that Yamaha may have.
    			-Steve Bulmer
    

    This is a little late but...
    
    The PPI is connected to the memory bank switch on the CX5M.  MSX
    computers support more that 64K of memory by using the PPI to switch
    banks in 16K blocks.  The SFG05 must be memory mapped at location
    7FF5,7FF6 in whatever bank 0C will get you.
    
    Now if I could only get a program to read the midi port.
    
    					MJC  (the other CX5M owner)