Born Dead #0G 31 марта 2000

Ассемблер     Звук     Программирование

Coding with their hands - Super-fast MCC player.

ЇЄ ЄєЇCODING own hands-II ЇєЄ ЄєЇ


(C) MOn5 + Er ^ Sa9e


                 Super-fast player with MCC


   Without intros and endings will bring the best option 
rasposledny player for the MCC method! Now they can play ALL -

Kotelnikov theorem is upon us!


        EI; to run the port AY n7 record # FF!

        HALT

        LD SP, START-SAMPLE-ADRESS

        LD IX, LOOP

        LD DE, # 08 +256 * ('MCC_TBL +1)

        LD BC, # FFFD

        OUT (C), E; incl. 8 AY_port (last channel)

LOOP: POP HL

        LD E, L

        LD A, (DE)

        DEC D

        EX AF, AF '

        LD A, (DE)

        LD E, 9

        OUT (253), A

        EX AF, AF '

        OUT (C), E

        OUT (253), A

        LD E, H

        LD A, (DE)

        INC D

        EX AF, AF '

        LD A, (DE)

        LD E, 8

        OUT (253), A

        EX AF, AF '

        OUT (C), E

        OUT (253), A

        JP (IX)

Handler INT'a:

INT: POP IY; have ADRs. return

        PUSH HL; restore corrupted SAMPL

        LD HL, 0

        ADD HL, SP

        LD BC, END_SAMPLE_ADDRESS

        OR A

        SBC HL, BC

        JR NC, END_INT

        LD BC, # FFFD

        POP HL

        JP (IY)
END_INT: a way out of the Player

160 cycles for two samples sample.
80 strokes per sample.
Fdiskret .= 3.5 MGts/80 = 43.75 kHz.

The player uses only one channel extreme AY, can be, and two for
double the volume (on quality, in principle, has almost no 
influence count extreme channels ...)


The only drawback may be slightly slip the end of the sample,
as check again in INT, but the lack of easy to fix: in
the end of the sample (and he always unsigned 0 .. # FF, but 
not -128 127) is filled with 896 bytes "silence" - Byte # 80 
and all. Why 896 - Because in INT'e 71,680 cycles (maximum at 
neturbirovannoy car) and 71680/80 = 896!