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#1 |
Registered User
Join Date: Apr 2011
Location: Brighton, UK
Age: 42
Posts: 114
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So as some of you may have seen in my other thread - I re-did a project from 2007 - an 8MB FastRAM board for the A600 originally published here: http://lvd.nedopc.com/Projects/a600_8mb/index.html
I have taken the schematics, updated them in KiCad 5.1.2 and adapted it for use with the A500. It's a 95% through hole project, again, for people with unsteady hands, or for those that might be scared of SMT - the only parts that are not through hole, are the 4x DRAM chips (all off the shelf parts from mouser.co.uk - no sourcing new old stock from china!), but these are all SOJ parts, so they should be large enough pitch to solder. Personally, I use a Yihua 937D, a Hakko chinese clone, that actually is surprisingly good for the £40 it cost me. I have as of this morning, fiddled with the layout, re-done the silkscreen, compacted everything a bit and re-routed the board so there are fewer via's. All the content is on GitHub here: https://github.com/kr239/A500-8MB-FastRAM ![]() You can use the original .jed files to burn them on the ATF1502ASV, but i will still be re-compiling them from the original verilog as soon as I have the time. |
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#2 |
Registered User
Join Date: Apr 2011
Location: Brighton, UK
Age: 42
Posts: 114
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Version 2!
https://github.com/kr239/A500-8MB-FastRAM/tree/v2 Smaller! More SMD! (but still solderable by hand) RED! ![]() ![]() Stepping stone to integrating a clock doubler and eventually autoboot IDE (fingers crossed) |
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#3 |
MI clan prevails
Join Date: Jul 2010
Location: Belgrade, Serbia
Posts: 1,443
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Red paint makes it faster
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#4 |
Registered User
Join Date: Jan 2004
Location: Yorkshire
Posts: 754
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Very nice!
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#5 |
Registered User
Join Date: Sep 2018
Location: Nottingham
Posts: 340
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Awesome
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#6 |
Registered User
Join Date: Feb 2016
Location: bolton
Posts: 145
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how do i get it printed as i dont now how to setup these pcb making sites looks hard , is it already on one where i can order some many thanks
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#7 |
Used Register
Join Date: Jul 2018
Location: Liverpool
Age: 41
Posts: 437
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Kai, gunna need a stand-in replacement for that memory. Digikey doesn't stock it and mouser only has 3 in stock. Any suggestions?
John |
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#8 |
Registered User
Join Date: Apr 2011
Location: Brighton, UK
Age: 42
Posts: 114
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Hmm - looks like digikey and mouser have just run out - an order will trigger their reinventory though.
IS41LV16105D-50KLI is another one to source as well. Both essentially the same. |
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#9 |
Registered User
Join Date: Apr 2011
Location: Brighton, UK
Age: 42
Posts: 114
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I'll be making these available for individual purchase at £8 + P&P per board as you have to order minimum quantities from the board houses.
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#10 |
Used Register
Join Date: Jul 2018
Location: Liverpool
Age: 41
Posts: 437
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What i've done, is order a couple of cheap old SIMM modules, with similar chips. Same as SukkoPera's board. I've ordered two different types, and they should be here by the end of the week - so if either of those work i'll let you know here.
GM71C18163CJ6 and GM71C18160CJ6 are the ones i've ordered by the way - both very cheap. They're 60ns instead of 50ns, but if Sukko's github is correct and given your board has similar origins to his, then they should be okay. Either way i'll only have wasted 10 quid. |
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#11 |
Registered User
Join Date: Apr 2011
Location: Brighton, UK
Age: 42
Posts: 114
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https://www.ebay.co.uk/itm/4X-GM71C1...EAAOSwDkVZ8boE - those'll do
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#12 |
Used Register
Join Date: Jul 2018
Location: Liverpool
Age: 41
Posts: 437
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Yep! I was looking at them too. Decided to go for a cheaper pull from an old SIMM until I can verify they work. But if they do, and that link is genuine NOS then that'd be the way to go.
My digikey order goes in today, so I'll let ya know as soon as I have info on compatibility. Probably looking at the weekend/early next week. This is the rev1 board BTW, not the new one. John |
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#13 |
Registered User
Join Date: Apr 2011
Location: Brighton, UK
Age: 42
Posts: 114
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They have loads of the TSOP ones so i might do a respin (v3) with SMD components, make it even smaller.
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#14 |
Used Register
Join Date: Jul 2018
Location: Liverpool
Age: 41
Posts: 437
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Who, mouser?
Yeah it seems both mouser and digikey are decidedly anti-soj |
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#15 |
Used Register
Join Date: Jul 2018
Location: Liverpool
Age: 41
Posts: 437
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I think i've got the jed sorted, if anyone wants to test it?
I'm just waiting for a USBISP to come now. I take it the xilinx programmer wont work. John |
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#16 |
Mighty Pirate
Join Date: Dec 2017
Location: On the borderline
Age: 44
Posts: 177
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What did you change in the JED?
I use a cheap USB Blaster clone with my boards, see https://github.com/SukkoPera/OpenAmi...aster/firmware. |
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#17 |
Used Register
Join Date: Jul 2018
Location: Liverpool
Age: 41
Posts: 437
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Oh i didn't change anything... Kai's version doesn't have a jed so i had to compile it from the verilog.
Yeah if i can't get this one to function i'm gunna give yours a go... Have you built one of your own yet yourself? John |
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#18 |
Mighty Pirate
Join Date: Dec 2017
Location: On the borderline
Age: 44
Posts: 177
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Yes, both my A500 and A600 expansions are tested and confirmed working. The A500 one works with either 4 or 8 MB.
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#19 |
Registered User
Join Date: Apr 2011
Location: Brighton, UK
Age: 42
Posts: 114
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The JEDs should work fine - I just wanted to make sure and compile it myself first
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#20 |
Used Register
Join Date: Jul 2018
Location: Liverpool
Age: 41
Posts: 437
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See anything wrong with this picture?
![]() Sorry Kai, gunna have some of Sukko's boards spun for now until this is ready. I'll be happy to give it a go then, tjough... |
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