SIMPLE-Z80

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CPU-z80 REV1 FRONT (BLK).png

Features

  • Build of Grant Searles's Simple Z80 CPU
    • Runs BASIC
  • Z80 CPU
  • 7.3728 MHz clock
  • 56KB SRAM (uses 128KB parts)
  • 8KB EPROM/EEPROM
  • 68B50 Serial Port (ACIA)
    • RS-232 port
    • Header for FTDI
  • Reset switch with optional Power Supervisor
  • 95x95mm card
  • (4) 6-32 mounting holes

Memory Map

  • 0x0000-0x1FFF 8KB ROM
  • 0x2000-0xFFFF 56KB SRAM
  • I/O
    • 0x00-0x7F - Free
    • 0x80-0x81 - Serial port (ACIA)

Headers

EPROM/EEPROM Select Jumpers

PART J2 PIN 1 J5 PIN 27
27128 EPROM VPP (5V) PGM (5V)
27C256 EPROM VPP (5V) A14 (GND)
27C512 EPROM A15 (GND) A14 (GND)
SST27SF256 EEPROM VPP (5V) A14 (GND)
SST27SF512 EEPROM A15 (GND) A14 (GND)

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

Mechanicals

SIMPLE-Z80 REV1 MECHS.PNG

Assembly Sheet

SIMPLE-Z80 Rev 1 Assembly Sheet