Difference between revisions of "Z80-MBC2 Build Notes"
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Revision as of 18:49, 23 July 2021
Contents
Sourced PCB
- ebay - bare PCB $8
- Arrived in a couple of days
Reference Docs
- An Easy to Build Real Homemade Computer: Z80-MBC2! - Instructable was helpful
- Hackaday project with files
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
- Serial port marking correlated to the FTDI card end not referenced from card internal
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).
- 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