Z80-MBC2 Build Notes

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Z80-MBC2 P586-720PX.jpg

Sourced PCB

  • ebay - bare PCB $8
    • Arrived in a couple of days

Reference Docs

Build Notes

  • All through hole construction
  • Build took less than 2 hours
  • Used mostly junk box parts
    • 20 MHz Z80
  • Purchased alternate SRAM
  • Purchased DIP machined sockets (I usually go cheaper but these were very nice)
  • Forgot to buy SIP resistors
    • Made my own SIP resistors
    • Pin 1 (boxed pin on silkscreen is the common
    • Used 1/8W resistors vertically mounted
  • 5mm LEDs fit into 3mm hole spacing
    • I didn't have a 3mm Blue so I used 5mm

Negatives

  • Ref des are not top-bottom or left-right
    • PDF Assembly drawing text is not searchable
    • Struggled to find some of the resistors on the PCB

Programming THE ATMEGA32

  • IOS-LITE build (no SD card support)
  • Was able to use ATProgHead ICSP 2x3 cable running Arduino as ISP to burn bootloader but not program the code
  • Could not use any of my FTDI cards for serial programming since they have RTS/CTS but not DTR
    • Most programmer setups in Arduino work just fine with RTS since both are usually pulled, but not the MightyCore
    • This is speculation as to why but I am able to program Screwduino cards just fine
  • Used TL866ii to program ATMEGA32 fuses
    • The Fuse bits should be: High Byte 0xD6, Low Byte 0xAF, Lock Byte 0xCF.
    • Reference: Setting AVR Fuse Bits
    • If you use the programmer defaults it sets the clock to 1 MHz which gives a serial port rate of 600 baud (told me I needed to fix the fuses).

Z80-MBC2-TL866II.PNG

  • Found path in dump in Arduino IDE:
Arduino: 1.8.13 (Windows 10), Board: "ATmega32, Yes (UART0), EEPROM retained, Standard pinout, BOD 2.7V, LTO disabled, External 16 MHz"
Sketch uses 28642 bytes (88%) of program storage space. Maximum is 32256 bytes.
Global variables use 1213 bytes (59%) of dynamic memory, leaving 835 bytes for local variables. Maximum is 2048 bytes.
C:\Users\HPz420\AppData\Local\Arduino15\packages\arduino\tools\avrdude\6.3.0-arduino18/bin/avrdude -CC:\Users\HPz420\AppData\Local\Arduino15\packages\MightyCore\hardware\avr\2.1.3/avrdude.conf -v -patmega32 -carduino -PCOM23 -b115200 -D -Uflash:w:C:\Users\HPz420\AppData\Local\Temp\arduino_build_883457/S220618_IOS-LITE-Z80-MBC2.ino.hex:i 

Other