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

Vss | ground
Vcc | +5V power
/RES | chip reset
Ø2 | phase 2 clock input
R/W | read/write
/IRQ | interrupt line, activated by PA7 or timer
D0-D7 | data bus
A0-A6 | address bus
/RS | chip RAM select
CS1 | chip select
/CS2 | chip select
PA0-PA7 | bidirectional port A
PB0-PB7 | bidirectional 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