Doc: "It works, ha ha ha ha, it works. I finally invent something that works." Marty: "Bet your ass it works."

A project log for Rämixx500 - Amiga 500+ Mainboard

Open Hardware Remake of this Commodore Masterpiece

Edoardo AUTERIEdoardo AUTERI 07/03/2021 at 08:020 Comments

The characterization test aimed to describe (characterize) the actual behaviour of the existing piece of hardware. The following verification of Ramixx500 V2 was executed:


To conclude, the major contributions of this work are as follows:

The presented power-aware design and test methodology provide an insight into the impact of within silicon and within PCB layout variation. Information regarding CAD versus silicon correlation derived from the test results helps to efficiently optimize CAD models.

A test circuit for accurate characterization of delays in clock and data paths for evaluating the extra timing margin available in silicon has been considered. Understanding the sources of extra margin aids in precisely establishing de-rate added during sign-off that fail-free operation can be ensured while deriving maximum performance from a given circuit.

Future Works

Based on the lessons learnt concerning layout design and chip tests for electrical and thermal characterization, in the future, we may consider implementing a comprehensive reliability/performance management strategy. Further increase in energy savings can be achieved by replacing Fast Page DRAM (440mW @ 5V per unit, in total 3.52W for 1MB) with SRAM (1W @ 5V in total), for example. Moreover, we have overcame known mistakes and limitations hence ensuring the original concept of "Rock Lobster".


Benchmark / Diagnostic:

Expansion & Accessories:

Power Supply Unit:

Tools & Equipment:


Operating System: