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--- oric:hardware:telestrat_joystick_drivers [2017/09/20 22:01]
jede
+++ oric:hardware:telestrat_joystick_drivers [2020/05/12 16:21] (current)
polluks [Notes about the Telestrat Joystick Ports] http://orix.oric.org/joysticks/
@@ Line 1: / Line 1: @@
+===== Notes about the Telestrat Joystick Ports =====
+The Telestrat came with two standard joystick ports on the left and right sides of the machine. The right joystick port was also suitable for the Telestrat Mouse and the left port also had an additional line for some sort of Joystick Doubler (perhaps to allow two joysticks whilst the other port was used for the Telestrat Mouse?).
+Note all drivers use a common label list that is found here [[oric:hardware:generic_joystick_drivers]]
+Be careful, on the VIA 6522, if you press something on the joystick, the bit is **LOW** on port B not **HIGH**
+You can use **PC joypad or usb mouse**, but you need more hardware to do that. You can buy [[https://allegro.pl/oferta/adapter-mysz-myszka-joystick-pad-psx-amiga-tom-r2-7564988407|Tom2]] hardware. You can plug a usb mouse, but you will need to code the driver with this mouse.
+===== Hardware Notes =====
+The Telestrat (unlike all its predeccesors) had two joystick Ports positioned on either side of the machine. Both were powered and both supported a second fire button. The Joystick (and second fire) was supported by Pulsoids.
+Both joysticks were connected to Port B of the second VIA of the Telestrat whilst the second fire was connected to Port A of the Second VIA (Location $032F)
+VIA2 PortB Location 0320
+  B7 Select Right Joystick
+  B6 Select Left Joystick
+  B5 -
+  B4 Up(Inverted)
+  B3 Down(Inverted)
+  B2 Fire(Inverted)
+  B1 Left(Inverted)
+  B0 Right(Inverted)
+Is it possible to read both joysticks by setting both B6 and B7?
+===== Generic Joystick Driver for the Telestrat Joystick Ports =====
+The following code provides a standard output for detection of joystick movements in your own code. The bits corresponding to joystick movement use a look up table to make them comply with the Generic Format.
+           GenericReadTelestratJoyPorts
+                LDA #%01000000 ;  PB6 	Select Left Joystick port
+                STA via2_portb ; Activate left port
+                LDA via2_portb ; Read port B
+                AND #%00011111 ; Mask to fetch joysticks bits PB0..PB4 	Joystick ports
+                TAX
+                LDA TelestratLower5BitJig,X
+                STA joy_Left
+                LDA #%10000000
+                STA via2_portb
+                LDA via2_portb
+                AND #%00011111
+                TAX
+                LDA TelestratLower5BitJig,X
+                STA joy_Right
+                RTS
+           TelestratLower5BitJig
+            .byt 0,2,1,0,32,34,33,to be continued..
+===== Testing routine for joystick port (Crap routine but it works) =====
+You will need to reset your telestrat (because it shifts portb register) after this routine
+  #define via2_portb    $0320
+  #define addr_vid $bb80+40*10+5
+  *=$1000
+  ;It does not select port (left or right : this means that the routine will work on both port)
+  ;if everything is OK, you will see that on the screen
+  ;      U
+  ;     RXL
+  ;      D
+  loop
+   lda via2_portb
+   lsr ; we 'lsr' to have a quicker routine
+   bcc right
+   lsr
+   bcc left
+   lsr
+   bcc fire
+   lsr
+   bcc down
+   lsr
+   bcc up
+   jmp loop
+  up
+   lda #85
+   sta addr_vid+1-40
+   jmp loop
+  down
+   lda #68
+   sta addr_vid+1+40
+   jmp loop
+  fire
+   lda #88
+   sta addr_vid+1
+   jmp loop
+  right
+   lda #82
+   sta addr_vid+2
+   jmp loop
+  left
+   lda #76
+   sta addr_vid
+   jmp loop

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