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AuthorTopic: New Amiga 500 and 500+ 512KB trapdoor memory expansion  (Read 1215 times)

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Offline masteries

New Amiga 500 and 500+ 512KB trapdoor memory expansion
« on: May 23, 2018, 12:45:39 PM »
Greetings,
 
During these past times I was developing a workaround in order to use  the remaining memory chips from an accelerated Atari ST project. This  project requires a change on installed memory due to memory acceses are  totally upgraded, new memory chips were used.
 
 
Now, these memory chips are used for an Amiga 500 chip RAM expansion, its a 512 KB trapdoor memory expansion. 
 
The results are these:
 

 

 
 
and the working results are these:
 
 

 
 
For Amiga 500+
 

 
 
 
For Amiga 500
 
 

 
 

 
 

 
 
I manufactured several of these, available at supermarket; these memory modules are hand manufactured at my home in Spain     and tested prior to be sent. These are sent on tracked packages also for international destinations.
 
The module includes short-circuit protection resistances and enable/disable switch.



Memory tests passed to the trapdoor memories,


Memory Test program:





Starting the test with a 512 KB trapdoor installed:




1.5 MB test:





 
Price is 21€ per unit (around 24.6 $  USD ); Spain tracked package cost 4€ and Intenational tracked cost 6.1 €
 
Original design post (Spanish) is:
 
https://www.gp32spain.com/foros/showthread.php?160981-Proyecto-La-Memorias-del-Pasado-Amiga-500-500
 
Its also listed on ebay, but certainly an ebay sell produce -2.1 € 
 
https://www.ebay.es/itm/273213007014?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649

« Last Edit: August 30, 2018, 01:14:20 PM by masteries »
 

Offline masteries

Re: New Amiga 500 and 500+ 512KB trapdoor memory expansion
« Reply #1 on: August 30, 2018, 01:14:54 PM »
Updated the first post with the results of a memory test program,
 

Offline masteries

Re: New Amiga 500 and 500+ 512KB trapdoor memory expansion
« Reply #2 on: October 03, 2018, 12:59:04 PM »
Up! There are units available!
 

Offline masteries