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CC-BY-NC-SA 3.0

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C64 ATmega
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ATMega88 to Commodore Bus

2 months ago 61
  • Description
  • Documents
  • BOM
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Description

Connect an Atmega to a C64 via the Commodore Serial Bus.

Attention! Remember that you either have to supply an oscillator (leave JP1 open) or configure the MCP2221 to output a clock signal (short the jumper JP1 in that case). Make also sure that the fuses of the Atmega are set correctly.

Documents

ATMega88 to CBM Serial Bus

Current_PCB

V1.0_PCB_2020-10-30_22-03-24

BOM

ID Name Designator Footprint Quantity
1 AVR_SPI_PROG J2 AVR_ICSP 1
2 HDR-F-2.54_1x2 H1 HDR-F-2.54_1X2 1
3 22pF C4,C5 RAD-0.1 2
4 USB JP2 USB-B-PTH 1
5 HEADER_6 J1 HDR-M-2.54_1X6 1
6 Jumper JP1 JUMPER2 1
7 MCP2221A-I/ST U2 PDIP-14 1
8 LED-TH-5mm_R LED3 LED-TH_BD5.0_RED 1
9 Header-Male-2.54_1x4 H2 HDR-TH_4P-P2.54-V 1
10 ATMEGA88-20PU U1 DIP-28_L34.6-W7.3-P2.54-LS10.2-BL 1
11 10k R1 R_AXIAL-0.4 1
12 LED-TH-5mm_G LED1,LED2 LED-TH_BD5.0_GREEN 2
13 100nF C1,C2 CAP-9.5*11.5*5 2
14 470nF C3 CAP-9.5*11.5*5 1
15 CRYSTAL Q1 HC49US 1
16 680 R2,R3,R4 R_AXIAL-0.4 3

Attachments

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