Retro Commodore Amiga 500 512KB Memory Expansion

(A501 Clone without RTC)

This is a tested and working project.

Components:

4pcs. 256K x 4Bit DIP-20 Dynamic RAMs

13pcs. 39 ohm 1/4 wattt resistances

4pcs. 100nf ceramic capacitors

1 piece toggle switch

1 piece 2x28 pin female header. (get 2x40 pin and cut it)

Some of compatible 256K x 4Bit dynamic RAMs list: (You can find from Aliexpress)

MB81C4256 (Fujitsu)

GM71C4256 (Goldstar)

HM514256 (Hitachi)

HY534256 (Hyundai)

MT4C4256 (Micron)

M5M44256 (Mitsubishi)

MCM514256 (Motorola)

MSM514256 (Oki)

KM44C256 (Samsung)

TMS44C256 (Texas Instruments)

TC514256 (Toshiba)

LC324256 (SANYO)

UPD424256 (NEC)

In order to protect your electronical devices, always turn off your Amiga before connecting or disconnecting the cables or any other device.

Gerber files and component list are subject to change without notice. Before paying for the PCBs, be sure to update your orders!

As you can see I have uploaded many projects and I am still working on new projects. If you have any questions, please look for answers online. Unless I specify explicitly, all my projects are tested and confirmed to work under normal circumstances before being shared. I'm sorry I didn't have enough time to answer all the questions.

Use this PCB at your own risk !

Have fun

Thank you.

C64istanbul