KEY CODES

The above codes are in` decimal ` so you will have to change the codes to `hex` to enter them in the `Monitor`. To get your program to read the keyboard you have to load `A` with the value in address `00C5`.A value code number is put in address `00C5` when a given key is pressed. Each key on your keyboard has a certain code number assigned to it.The list of code numbers are listed above ,with their own key assigned on the left of the code number. Refering back to the previous `Screen and colour character position addresses` page and using the program there and adding the program below to get `key` control, enter the `Monitor` and type .A C015 LDA$00C5 [load `A` with the value number thats in address 00C5] .A C018 CMP#$3C [compare the value in `A` with the value `3C` (code number for key `space`)] .A C01A BEQ$C01F [branch to address C01F if the value in address 00C5 equals `3C`] .A C01C JMP$C015 [jump to address C015( main loop)] .A C01F LDA#$51 [load `A` with the value of `51` (`ball`)] .A C021 STA$0400 [store the value of `A` into screen address 0400] .A C024 LDA#$04 [load `A` with the value of `04` (code number for colour purple)] .A C026 STA$D800 [store the value of `A` into address D800 (colour address for screen address 0400)] .A C029 JMP$C01F [jump to address C01F to keep program running] As before as in the previous page please do not enter in the `Monitor` after the commands the `brackets [ ]` and the `information`.The information is just there for reference. Clear the screen and type in .X and press `Return` to return to `basic`.Type SYS49152 and press `Return` to run the program.If you press key `space` you will see on the screen on the top left hand corner a `purple ball`. Press `Stop/Restore` same time to return to `basic`. Please note from previous program, line address `C015` the command `JMP$C00B` was changed to `LDA$00C5` for the above part of the program.

Codes for joystick port 2

The following `codes` for joystick are read from address DC00 (port 2):- JOYSTICK POSITION CODE READ neutral 7F left 7B right 77 up 7E down 7D fire 6F up+fire 6E down+fire 6D left+fire 6B right+fire 67