Keyboard Code Test

[CaptMatteus]

I needed to do some keyboard input, and given that all the books I have list all the various keyboard codes in decimal and not hex, I scratched my itch.  My program opens the K: keyboard device and shows the various codes for each key pressed.  It's a toy, and certainly not perfect, but I wanted to explore CIO and keyboard input in assembly.

KeyTest.s KeyTest.xex

Edited March 2, 2021 by CaptMatteus
grammar

[TGB1718]

seems to be a lot of garbage at the top of the screen, also doesn't show any text for "SPACE BAR" nor inverse characters

 

[CaptMatteus]

Interesting.  I tested on my 800XL and the Atari800MacX emulator without any problem.  I have not run it on Altirra.  I do want to try on my 800 as well, because it has the Atari key.

Edited March 2, 2021 by CaptMatteus

[CaptMatteus]

I also tested on my Incognito-equipped Atari 800 (what a fabulous piece of hardware BTW) against most of the OSes. I had no problems against a Stock OS-B 48K machine, Altirra OS, XL/XE 64K and AXLON 1088, all were good.

 

I wonder what is causing the problem on Altirra?

[TGB1718]

2 hours ago, CaptMatteus said:

I wonder what is causing the problem on Altirra?

I figured it out, you are using a custom display list and are not making sure the screen area is cleared, so

if you've run anything before using this and it used that memory area, it's still there and will display.

I compiled your code using MAC65, it ran ok, but I had a full screen of garbage, I went into BUG65

cleared $9000-$9400, ran it again and it was fine.

 

[CaptMatteus]

30 minutes ago, TGB1718 said:

I figured it out, you are using a custom display list and are not making sure the screen area is cleared, so

if you've run anything before using this and it used that memory area, it's still there and will display.

I compiled your code using MAC65, it ran ok, but I had a full screen of garbage, I went into BUG65

cleared $9000-$9400, ran it again and it was fine.

 

Ahh, totally makes sense.  So I can add a little code to clear out the screen memory and then it'll be good to go.

 

I love feedback, it (nearly) always makes me a better programmer.  I certainly do not claim to be ANY sort of expert on the Atari platform. So, much appreciated.

 

Edited March 2, 2021 by CaptMatteus

[TGB1718]

Clear won't do it on it's own, you have the text loaded directly into the screen memory, so a clear clears it too.

 

I changed your code like this:-

comment out the *= and add labels

 

;   *=  $9008
C1       .SBYTE "CHARACTER INPUT TESTER"

.BYTE 255 ; END OF STRING FOR LOOP TEST
; *=  $92D0
C2       .SBYTE "ATASCII:  H(   ) DISPLAY:  H(   )"
.BYTE 255 ; END OF STRING FOR LOOP TEST
;   *=  $92A8
C3       .SBYTE "RAW:   H(   )"
.BYTE 255 ; END OF STRING FOR LOOP TEST

 

then added the following code just after the dlist is set.

 

         LDX #0 ; CLS
         TXA 
CLSLOOP  STA $9000,X
         STA $9100,X
         STA $9200,X
         STA $9300,X
         INX 
         BNE CLSLOOP
         LDX #0 ; TEXT STRINGS TO SCREEN
XLOOP    LDA C1,X
         BMI N1
         STA $9008,X
         INX 
         JMP XLOOP
N1       LDX #0
XLOOP1   LDA C2,X
         BMI N2
         STA $92D0,X
         INX 
         JMP XLOOP1
N2       LDX #0
XLOOP2   LDA C3,X
         BMI N3
         STA $92A8,X
         INX 
         JMP XLOOP2
         ;           FOR GRAPHICS MODE 0, WE CAN SET THE BACKGROUND COLOR AND A FOREGROUND LUMINANCE
         ;           WHEICH HERE WILL BE THE TEXT COLOR
N3       LDA #$00    ; MODE 0 BACKGROUND COLOR