notaz.gp2x.de / megadrive.git / blame
| Commit | Line | Data |
|---|---|---|
| ffd4b35c | 1 | ORG $0 |
| 2 | ||
| 3 | init | |
| 4 | di | |
| 5 | im $1 | |
| 6 | ld sp, $2000 | |
| 7 | ||
| 8 | loop | |
| 9 | ld a, ($1000) ; 13 | |
| 10 | or a ; 4 | |
| 11 | jp z, loop ; 10 27 (41 worst) | |
| 12 | ||
| a385208c | 13 | ld hl, ($1002) ; src 20 |
| 14 | ld de, ($1004) ; dst 20 | |
| 15 | ld bc, ($1006) ; len 20 | |
| 16 | ||
| 17 | cp a, 2 ; 7 | |
| 18 | jp z, rd_timing ; 10 77 (118) | |
| 19 | ||
| 20 | ldir ; 21/16 | |
| 21 | jp end ; 10 | |
| 22 | ||
| 23 | rd_timing | |
| 24 | ld d, h ; 4 | |
| 25 | ld e, l ; 4 | |
| 26 | inc de ; 6 14 (132) | |
| 27 | loop_read | |
| 28 | ld a, (hl) ; 7 | |
| 29 | ld a, (de) ; 7 | |
| 30 | dec bc ; 6 | |
| 31 | ld a, b ; 4 | |
| 32 | or a, c ; 4 | |
| 33 | jp nz,loop_read ; 10 38 | |
| 34 | ||
| 35 | ld a, ($7f08) ; vcnt 13 | |
| 36 | ld de, ($1004) ; dst 20 | |
| ffd4b35c | 37 | ld (de), a ; 7 |
| a385208c | 38 | jp end ; 10 50 |
| ffd4b35c | 39 | |
| 40 | ; --- | |
| 41 | ||
| 42 | BLOCK $38-$ | |
| 43 | ||
| 44 | irq | |
| 45 | ret | |
| 46 | ||
| a385208c | 47 | ; --- |
| 48 | ||
| 49 | end | |
| 50 | xor a ; 4 | |
| 51 | ld ($1000), a ; 13 | |
| 52 | jp loop ; 10 27 | |
| 53 |