RIOT

Description

RIOT contains 2 8bit ports, timers, IRQ controller and 128bytes of RAM. In Atari consoles it works with joysticks and console switches.

Catalogue numbers

C010750
C016150
UM6532

Pinout


pinout
Vssground
Vcc+5V power
/RESchip reset
Ø2phase 2 clock input
R/Wread/write
/IRQinterrupt line, activated by PA7 or timer
D0-D7data bus
A0-A6address bus
/RSchip RAM select
CS1chip select
/CS2chip select
PA0-PA7bidirectional port A
PB0-PB7bidirectional port B

4 bits of PA are used for first stick, other 4 bits for second stick.

2600: Bits PB0,1,4,6,7 are used for reset, select, b/w, left diff, right diff

7800: Bits PB0,1,3,6,7 are used for reset, select, pause, left diff, right diff

7800: Bits PB2 & 4 are used for output to select 2 button mode. . Back (c) 1998-2004 Jindroush Last modified: Tue Dec 3 22:27:52 2002