SIMPLE-6809

Features

• Build of Grant Searles's Simple 6809 CPU
  • Runs BASIC
• 6809 CPU
• 1.8543 MHz
• 32KB SRAM
• 16KB EPROM/EEPROM
• 68B50 Serial Port (ACIA)
  • RS-232 port
  • Header for FTDI
  • 115,200 baud
• Reset switch with optional Power Supervisor
• 95x95mm card
• (4) 6-32 mounting holes

Memory Map

• 0x0000-0x7FFF 32KB SRAM
• 0x8000-0x9FFF Free Space (8KB)
• 0xA000-0xBFFF Serial (ACIA)
• 0xC000-0xCFFF 16KB EPROM

Connectors

J1 - RS-232 Serial

1. N/C
2. Receive
3. Transmit
4. Loop to pin 6
5. GND
6. Loop to pin 4
7. RTS
8. N/C
9. N/C

J3 - FTDI / TTL Serial

1. GND
2. RTS* (out)
3. +5V
4. Receive (in)
5. Transmit (out)
6. N/C

J4 - 5V Power

• 2x4 header

Mechanicals

Assembly Sheet

SIMPLE-6809 Rev 1 Assembly Sheet