Thanos - Spectrum Computing

General info for: Thanos [#ID: 5221]

Title:

Thanos

Release Date:

1989/May

Original Publisher:

Magazine MicroHobby - within covertape "MicroHobby issue 188: Tape 7"

Creators:

Jose Luis Jimenez (Spain)
Vicente Javier Jimenez [Vicente Javier Jimenez Vazquez] (Spain)

Availability:

Available

Message Language:

Spanish

Machine Type:

ZX-Spectrum 48K

Genre:

Arcade Game: Action

Maximum Players:

Controls:

Cursor
Interface 2 (left)
Interface 2 (right)
Redefineable keys

Known Errors:

Bugfix provided by Mr. Anonymous:

Game crashes at start of level 3.
Fixed using POKE 47050,201: POKE 47051,2: POKE 47087,1: POKE 47088,5

Bugfix provided by Bandit and Einar Saukas:

Main hero's image is sometimes corrupted when player is located at the right or left edge of screen. This problem is caused by the game preventing the player from moving outside the right or left edge without taking into consideration sprite changes due to the player animation. The original implementation works as follows:

; player moving right:
658c 216b65    ld hl,$656b      ; current player position
658f 7e        ld a,(hl)
6590 fe1d      cp $1d           ; max column = 29
6592 c8        ret z
6593 34        inc (hl)         ; move right
6594 3a7f60    ld a,($607f)
6597 fe01      cp $01
6599 280f      jr z,$65aa
659b fe02      cp $02
659d 2812      jr z,$65b1
659f fe04      cp $04
65a1 280e      jr z,$65b1
65a3 218400    ld hl,$0084      ; next "walking right" frame
65a6 226e65    ld ($656e),hl
65a9 c9        ret
...
; player moving left:
65e0 216b65    ld hl,$656b      ; current player position
65e3 7e        ld a,(hl)
65e4 fe00      cp $00           ; min column = 0
65e6 c8        ret z
65e7 35        dec (hl)         ; move left
65e8 3a7f60    ld a,($607f)
65eb fe01      cp $01
65ed 280f      jr z,$65fe
65ef fe02      cp $02
65f1 2812      jr z,$6605
65f3 fe04      cp $04
65f5 280e      jr z,$6605
65f7 211800    ld hl,$0018      ; next "walking left" frame
65fa 226e65    ld ($656e),hl
65fd c9        ret

The following patch fixes the problem in the same number of bytes:

; player moving right:
658c 216b65    ld hl,$656b
658f 7e        ld a,(hl)
6590 fe1d      cp $1d
6592 2801      jr z,$6595       ; POKE 26002,40: POKE 26003,1
6594 34        inc (hl)         ; POKE 26004,52
6595 3a7f60    ld a,($607f)     ; POKE 26005,58: POKE 26006,127: POKE 26007,96
6598 3d        dec a            ; POKE 26008,61
6599 280f      jr z,$65aa
659b fe01      cp $01           ; POKE 26012,1
659d 2812      jr z,$65b1
659f fe03      cp $03           ; POKE 26016,3
65a1 280e      jr z,$65b1
65a3 218400    ld hl,$0084
65a6 226e65    ld ($656e),hl
65a9 c9        ret
...
; player moving left:
65e0 216b65    ld hl,$656b
65e3 7e        ld a,(hl)
65e4 b7        or a             ; POKE 26084,183
65e5 2801      jr z,$65e8       ; POKE 26085,40: Poke 26086,1
65e7 35        dec (hl)
65e8 3a7f60    ld a,($607f)
65eb fe01      cp $01
65ed 280f      jr z,$65fe
65ef fe02      cp $02
65f1 2812      jr z,$6605
65f3 fe04      cp $04
65f5 280e      jr z,$6605
65f7 211800    ld hl,$0018
65fa 226e65    ld ($656e),hl
65fd c9        ret

Modified "BUGFIX" file provided by Einar Saukas.

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