Difference between revisions of "SIMPLE-6502"

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| A14 (GND)
 
| A14 (GND)
 
|-
 
|-
| SST27SF256 EEPROM
+
| AT28C64 EEPROM
 +
| N/C
 +
| WE (5V)
 +
|-
 +
| SST27SF256 FLASH
 
| VPP (5V)
 
| VPP (5V)
 
| A14 (GND)
 
| A14 (GND)
 
|-
 
|-
| SST27SF512 EEPROM
+
| SST27SF512 FLASH
 
| A15 (GND)
 
| A15 (GND)
 
| A14 (GND)
 
| A14 (GND)

Revision as of 10:32, 13 September 2022

CPU-65C02 REV1 FRONT (BLK).png

Features

  • Build of Grant Searles's Simple 6502 CPU
    • Runs Microsoft (OSI) BASIC
  • 6502 CPU
  • 0.9216 or 1.8432 MHz clock
  • 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

Headers / Connectors

SIMPLE-6502 REV1 CAD.PNG

J1 - RS-232 Serial

  • DB-9 Male
  • Pinout
  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

J2 - Speed Select Jumper

  • 1-2 - 0.92 MHz
  • 2-3 = 1.8432 MHz

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

J5 / J6 - EPROM/EEPROM Select Jumpers

PART PIN 1 PIN 27
27128 EPROM VPP (5V) PGM (5V)
27C256 EPROM VPP (5V) A14 (GND)
27C512 EPROM A15 (GND) A14 (GND)
AT28C64 EEPROM N/C WE (5V)
SST27SF256 FLASH VPP (5V) A14 (GND)
SST27SF512 FLASH A15 (GND) A14 (GND)

JP1 - CPU Pin 1

  • Install if CPU is not a WDC 65C02 or WDC 65C816

Mechanicals

SIMPLE-6502 REV1 MECHS.PNG

Assembly Sheet

SIMPLE-6502 Rev 1 Assembly Sheet