bryc

#include <stdio.h>
 #include <stdint.h>
int main(void)
{
    uint64_t A1, A2, A3=0x13108B3C1, T0, T1, T2, T3, T4=0, T5, T6, T7, T8, T9, S1, V0, AT, S3;
    int i;

    unsigned char bytes[28] = {
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,
        0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF,

bryc

DX7

These are the original 32 algorithms as used in Yamaha DX7.

The later Yamaha FS1R and Yamaha SY77 may have compatibility with these algorithms, but that's beyond the current scope. The FS1R contains 88 algorithms, while the SY77 contains 45 algorithms.

DX9

bryc

bryc

.cpu 8080
; 8-bit Modulo-255 checksum (aka end-around-carry) - Null terminator version
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
start:
    mvi C, $00  ; Initialize checksum value to zero
    lxi H, data ; Store the RAM address of our input data, in register HL
csum:
    mov A, M    ; Get next input byte (Accumulator = RAM at address HL)
    cpi 0       ; If Accumulator is zero, enable zero flag
    jz done     ; If zero flag is set, break out of loop

bryc

// Optimal version of the XS1 checksum function.

function xs1cksm(data) {
    let sum = [0, 0];
    for(let i = 0, tmp; i < data.length; i++) {
        tmp = (Math.imul(data[i], i) + sum[0] + 1994) >>> 0;
        sum[1] = (sum[1] + (tmp < sum[0] ? 1 : 0)) >>> 0;
        sum[0] = tmp;
    }
    return sum;

bryc

// #### ARRAY <-> STRING CONVERSION ####

// b62 - reversible base62 encoder/decoder in two lines.
function b62(n,c="0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"){var r="",l=c.length,i=0;
if(n.trim)while(i<n.length)r=l*r+c.indexOf(n[i++]);else while(n>0)r=c[n%l]+r,n=Math.floor(n/l);return r}

// arst is a reversible string<>array utility in one line. It converts a string to an array of integers and back.
// ES6 (shorter)
arst=a=>{return a.trim?[...a].map(a=>a.charCodeAt()):String.fromCharCode.apply(0,a)}

bryc

Original process:

ultraSMS and ultraMSX2 both have a rominserter.exe file which insert a ROM into
the respective v64 (byteswapped) emulator at a specific offset. It actually inserts the ROM byteswapped,
allowing the V64jr or other to re-swap it when loading on the N64. This is quite stupid.

The filesize of the output ROM appears to be incompatible with 64drive, and must be 1052672 bytes.
Also, to run on 64drive's USB mode, they must not be in v64 format, and must be in the original z64 format.

TODO: Load large ROMs into the rominserter and see exactly where it stops writing at. Should shed light

bryc

<links>
<entry name="Project 2612 - Mega Drive Music Archive" url="http://project2612.org/"/>
<entry name="SMSPower/VGM - Sega 8-bit Music Archive" url="http://www.smspower.org/Music/VGMs"/>
<entry name="SNES Music - SNES Music Music Archive" url="http://snesmusic.org/v2/"/>
<entry name="NSF Directory - Nintendo Music" url="http://nsf.joshw.info/"/>
<entry name="Zophar/disch - NSFE Archive" url="http://disch.zophar.net/nsfe.php"/>
<entry name="melcom's Chiptune Archive - YM, MOD, Adlib" url="http://chiptunes.back2roots.org"/>
<entry name="USF @ hcs64 - Nintendo 64 Music" url="http://usf.hcs64.com/"/>
<entry name="" url="http://kss.joshw.info/"/>
<entry name="" url="http://hes.joshw.info/"/>

bryc

// BSD-16
// From: en.wikipedia.org/wiki/BSD_checksum
function bsd16(data) {
    for(var i = 0, c = 0; i < data.length; i++) {
        c = (c>>1) + ((c&1) << 15);
        c += data[i];
        c &= 0xffff;
    }
    return c;
}

bryc

    function noteFromKey(keyCode) {
        var char = String.fromCharCode(keyCode).toUpperCase();
        if(pianoMap[char]) {
            return pianoMap[char];
        }
        else {
            return false;
        }
    }
/*