COMMODORE VIC-20 SD2IEC + 35KB (27+8) RAM EXPANSION CARTRIDGE
COMMODORE VIC-20 SD2iEC + 35KB (27+8) RAM
This is a tested and working project. (Tested on a NTSC Commodore VIC-20 plugged to a C64 PSU)
COMMODORE VIC-20 SD2iEC + 35KB (27+8) RAM Expansion Cartridge is an Easy DIY project, all components are through hole, marked on the PCB, Easy to solder, Easy to make
This PCB is a combination of two independent projects, one of them is SD2iEC (Commodore disk drive emulator) and the other is Commodore VIC-20 35KB (27+8) RAM Expansion Cartridge
They can be used separately or both together
This, "Commodore VIC-20 SD2iEC + 35KB (27+8) RAM Expansion Cartridge" PCB is also available for SMD ATMEGA644P and ATMEGA1284 in TQFP package, you may prefer to use either DIP or TQFP package. DIP package is easier to program and easier to solder, but TQFP package AT644P or AT1284 are usualy cheaper and easy to find than DIP package models
COMPONENTS for RAM EXPANSION part
62256 DIP28 (32KB STATIC RAM)
6264 DIP28 (8KB STATIC RAM) (You can use 62256 or 4364)
74LS21 DIP14
2PCS. DIP28 WIDE IC SOCKET
DIP14 IC SOCKET
8P DIP SWITCH (You can use 2x8 Pin 2.54mm pitch male header and 8pcs. jumper caps)
8 PCS. 1/4 WATT 10K OHM RESISTOR
3 PCS. 100nF CERAMIC CAPACITOR
220 μF 16V ELECTROLYTIC CAPACITOR
RIGHT ANGLE TACTILE BUTTON (For RESET Button)
COMPONENTS for SD2iEC part
6 pin Micro SD Card Module (will be placed to the bottom side)
3mm RED LED
3mm BLUE LED
2 PCS. 470ohm - 1K 1/4watt RESISTANCE (value changes leds brigtness)
10K 1/4watt RESISTANCE
8 Mhz Passive Quartz Crystal
1N4148 DIODE
2 PCS. 22pf or 33pf ceramic CAPACITORS
100nF ceramic CAPACITOR
6pin MALE DIN CONNECTOR
6PIN MALE HEADER
1PCS. HEADER JUMPER CAP
3 PCS. RIGHT ANGLE TACTILE BUTTON
6 PCS. 30cm MALE-FEMALE DUPONT CABLE
Micro SD CARD (4GB will be enough)
2 PCS. 2PIN MALE HEADER
ATMEGA1284 or ATMEGA644 (DIP40 or TQFP)
DIP40 WIDE IC SOCKET (if prefered to use ATMega DIP40 )