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Amiga computer related discussion => Amiga Marketplace => Topic started by: masteries on May 23, 2018, 12:45:39 PM

Title: New Amiga 500 and 500+ 512KB trapdoor memory expansion
Post by: masteries 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:
 
(https://preview.ibb.co/mDU4o8/ara.jpg)
 
(https://preview.ibb.co/dRqr1T/SAM_2671.jpg)
 
 
and the working results are these:
 
 
(https://preview.ibb.co/itaxao/SAM_2667.jpg)
 
 
For Amiga 500+
 
(https://preview.ibb.co/jsOuMT/SAM_2669.jpg)
 
 
 
For Amiga 500
 
 
(https://preview.ibb.co/cZX4MT/20180520_20.jpg)
 
 
(https://preview.ibb.co/kh9Uo8/20180520_204.jpg)
 
 
(https://preview.ibb.co/chS4MT/20180520_2048.jpg)
 
 
I manufactured several of these, available at supermarket; these memory modules are hand manufactured at my home in Spain  (http://www.lemonamiga.com/forum/images/smiles/icon_smile.gif)   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:

(https://preview.ibb.co/d2Dtsp/Memtest.jpg)



Starting the test with a 512 KB trapdoor installed:

(https://preview.ibb.co/mbv6Cp/512_KB_start.jpg)


1.5 MB test:

(https://preview.ibb.co/g4KoQ9/512_KB_End.jpg)



 
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 (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 €  (http://www.lemonamiga.com/forum/images/smiles/icon_razz.gif)
 
https://www.ebay.es/itm/273213007014?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649 (https://www.ebay.es/itm/273213007014?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649)

Title: Re: New Amiga 500 and 500+ 512KB trapdoor memory expansion
Post by: masteries on August 30, 2018, 01:14:54 PM

Updated the first post with the results of a memory test program,

Title: Re: New Amiga 500 and 500+ 512KB trapdoor memory expansion
Post by: masteries on October 03, 2018, 12:59:04 PM

Up! There are units available!

Title: Re: New Amiga 500 and 500+ 512KB trapdoor memory expansion
Post by: masteries on November 28, 2018, 07:00:30 PM

Up!

Customers experience at:

http://www.va-de-retro.com/foros/viewtopic.php?f=50&t=7107&p=133905#p133905

Title: Re: New Amiga 500 and 500+ 512KB trapdoor memory expansion
Post by: masteries on July 22, 2020, 07:16:01 PM

Up!

There are available units!