2013年10月10日 · Another one of my hare-brained schemes has been ill-conceived and is on its way. Felt like learning more about how the DRAM sub-system works on the Amiga, so I've set off to create a new redesigned A501 512K memory module for the Amiga 500's.

2021年4月12日 · 安裝a501需要搭配電路圖來對照,有些零件是線路圖上面有的, 但是在PCB上面必需要自行併聯,我整理好了如下圖,安裝之前請注意以下: PCB板上面標示為D的請安裝1N4148

This is a replica of the original RA5-512K expansion memory for the A500. Two small changes/improvements has been made to this pcb. Increased the pitch for the battery pins to 20 mm to accomodate for a coin cell battery holder (e.g. CR2032). Moved C2 somewhat to the right.

2020年9月15日 · This is a replica of the original Commodore A501+ Ram Expansion for the Amiga 500. As many of these died because of battery leakage this gives you the possibility to repair damaged PCBs. This Version uses a more common pinheader to the mainboard!

Minimal A501 for Amiga500. I've decided to open source my design after building few batches of these. Two versions of gerbers are available, single and panelized version which fits 4 boards inside 10x10cm area (many china pcb houses offer cheap deals on custom panelized under 10x10cm boards). Should work on all A500/A500+ machines Rev.3->Rev.8

2021年4月19日 · A501是Luxman在1981年所推出的一款後級套件，當初售價為日幣55000元，甫一推出就受到極大的好評，也奠定了Luxman在音響發燒圈的地位。 若將A501的功能放在現在，相信可 ...

2025年4月2日 · Amiga A501 R5 Replica PCB 500 Memory Expansion. Fix your A501 or make a new one. (#185005265288) Works great on my Kaypro out of the box. Awesome device and great seller! I'm very happy with the shipping price and speed too.

Here you can buy a modern re-creation of an Amiga 500/500+ trapdoor memory board. It is very similar in function to a Commodore A501 from the 1980s, providing 512 KB of memory and a real-time-clock (RTC). Many original A501s have become damaged from battery acid leakage, so a modern replacement is created here.

Upgrade your Amiga 500 effortlessly with this compact Mini A501 single-chip RAM expansion! This small yet powerful PCB adds 512K of additional memory, configurable as either Chip RAM or Slow RAM depending on your system’s needs.

This post describes how I repaired an A501 Trapdoor memory expansion. I explain how to diagnose the error and some tricks how this can be done with just an Amiga 500. The symptoms are that the Amiga does not boot and indicates a yellow screen.