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14 September 2019, 19:56
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#1 |
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Registered User
Join Date: Jun 2018
Location: Stockholm
Age: 48
Posts: 264
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RA5-512K remake
This is a reverse-engineered version of the RA5-512K expansion memory card for A500.
Why do a remake of this old pcb? -For those who might want to reuse/save components from an old A501 or similar battery leaked/damaged board (if the pcb is beyond repair). -Preserving a bit of history -For fun -For trying out diptrace Github is here (open source): https://github.com/jbilander/RA5-512K  
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14 September 2019, 20:41
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#2 |
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Registered User
Join Date: Oct 2016
Location: Norway
Posts: 170
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Fun is absolutely the right motivation for doing anything
 Good job!
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14 September 2019, 20:54
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#3 | |
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Registered User
Join Date: Aug 2014
Location: Netherlands
Posts: 695
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Quote:
And good documentation 
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01 June 2021, 09:18
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#4 |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Hi,such as components needs for RAM without RTC circuit?
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01 June 2021, 13:41
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#5 |
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Registered User
Join Date: Jun 2018
Location: Stockholm
Age: 48
Posts: 264
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In that case I think you can skip these: BAT, C1-C5, R4, Y1, U5
and then only a 2 x 20 connector is needed, I think, like this: https://rainisto.github.io/Minimal_A501/ but I haven't tried this myself. |
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02 June 2021, 07:40
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#6 |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Thanks
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17 December 2021, 09:28
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#7 |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Hi,have some pcs DRAM TMS44C256-80N also compatible?
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09 March 2022, 18:23
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#8 |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Finished soldering everything but when plug on my Amiga 500 REV5 motherboard get a green screen any idea?
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09 March 2022, 22:17
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#9 |
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Registered User
Join Date: Apr 2010
Location: Italy
Posts: 1,136
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Use a diagnostic
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10 March 2022, 10:27
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#10 | |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Quote:
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10 March 2022, 18:18
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#11 | |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Quote:
I tried with diagrom 1.2.1 this also crashes, in my opinion the ram banks not works.... |
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09 April 2022, 11:30
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#12 |
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Registered User
Join Date: Jul 2013
Location: Argentina
Posts: 23
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Make sure you're using the correct resistor packs (RPx) as they come as isolated (i.e. 102) or bus (i.e. 101) types. They must be of the isolated type.
Last edited by CentralPerk; 09 April 2022 at 11:39. |
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09 April 2022, 11:56
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#13 |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Buy the resistor array on aliexpress
https://www.aliexpress.com/item/3299...4e3bf19cv8uquE And soldering on this direction http://postimg.cc/bdy843YQ I don't know if these are good. |
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09 April 2022, 12:05
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#14 |
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Registered User
Join Date: Jul 2013
Location: Argentina
Posts: 23
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I'm afraid they are of the wrong type.
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09 April 2022, 12:06
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#15 | |
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Registered User
Join Date: Oct 2009
Location: Italy
Age: 45
Posts: 196
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Quote:
Now i understand why it doesn't work. Many thanks! Last edited by danko; 10 April 2022 at 08:47. |
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