Memotech MTX: Title

Looking for ROMS... Like the Pascalrom and other roms.... Please Email if you have them in binary file or so...... Also Looking for EH the programmer of Blobbo,Toado and Super Minefield..... Please Email me:)

Hits since 11-May 2003:

Last update: 2-JUNE 2012
Memotech MTX: Title 
























 
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Memotech keyboard layout 
Keyboard matrix.

IN 5 IN 6 OUT 5 BIT 7
(127/#7F) 		BIT 6
(191/#BF)		 BIT 5
(223/#DF)		 BIT 4
(239/#EF)		 BIT 3
(247/#F7)		 BIT 2
(251/#FB)		 BIT 1
(253/#FD)		 BIT 0
(254/#FE)
(128/#80) BIT 7 . KEY> ENT CLS CSRDN HOME CSRRT CSRLF CSRUP EOL PAGE
(64/#40) BIT 6 . KEY> INS RT.SHIFT RET ] } LINEFEED [ { ^ ~ |  \
(32/#20) BIT 5 . KEY> (UNDERSCORE) ? / : * ; + @ ` P 0 (Zero) = -
(16/#10) BIT 4 . KEY> . > , < L K O I 8 9
(8/#08) BIT 3 . KEY> M N J H U Y 6 7
(4/#04) BIT 2 . KEY> B V G F T R 4 5
(2/#02) BIT 1 . KEY> C X D S E W 2 3
(1/#01) BIT 0 . KEY> Z LF.SHIFT A ALPHALOCK Q CTRL ESC 1
- (2/#02) BIT 1 KEY> F4 F8 F3 F7 F6 F2 F5 F1
- (1/#01) BIT 0 KEY> SPACE (unused) (unused) (unused) DEL TAB BS BRK

Joystick ports are mapped to Keys:

Joystick Left Port: M=Down B=Up C=Right Z=Left SPACE=Fire

Joystick Right Port: CSRDN=Down CSRUP=Up CSRRT=Right CSRLF=Left HOME=Fire


Use the OUT opcode (from the yellow line) and use the BIT opcode to check if key pressed. Z is set if key pressed.

Its only clever to check the output with the BIT instruction. No need to use CP.
You can test why, in Andy Key's Mission Alphatron, try to hold down F4 and Space, Space then dont throw any bombs anymore.
By the way who is stupid enough to press the F4 key and Space in the same time :)

(HEHE Sorry ANDY for this example - ANDY KEY is still a way better Programmer than me J)

Mission Alphatron.
Check Space pressed
(By Andy Key)
(This code take up #0F Bytes)

 
 






 

 LD A,#7F
OUT (5),A
PUSH AF
POP AF
IN A,(6)
AND 3
CP 2
CALL Z,#97DF
RET

This way take up less Space and work also if F4 is pressed.
(By Claus Bękkel)
(This code take up #0B Bytes)







 

 LD A,#7F
OUT (5),A
IN A,(6)
BIT 0,A
CALL Z,#97DF
RET

 

 
The Z80 Instruction BIT n,A works this way: Opposite of the bit number n is written into the Z flag.
C is preserved, N is reset, H is set, and S and P/V are undefined.
 
 

This will loop until
HOMEkey is pressed.

START:





 

 LD A,223
OUT (5),A
IN A,(5)
BIT 7,A
JR NZ,START
RET
 

Reading Port 6.
This will loop until SPACE is pressed.

START:





 

 LD A,127
OUT (5),A
IN A,(6)
BIT 0,A
JR NZ,START
RET
 

This will loop until both S and K key
 are pressed at the same time.

START:






 

 LD A,239
OUT (5),A
IN A,(5)
BIT 1,A
JR NZ,START
BIT 4,A
JR NZ,START
RET


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