SukkoPera's Open Source Hardware: A500/A600 Chip/Fast RAM Expansions - Page 2

SukkoPera · 12 June 2019, 12:39

It's here:

https://www.exxoshost.co.uk/forum/vi...=1611&start=20

sampedenawa · 12 June 2019, 13:56

Quote:

Originally Posted by SukkoPera

It's here:

https://www.exxoshost.co.uk/forum/vi...=1611&start=20

obrigado meu amigo

project23 · 12 June 2019, 14:04

Sukko, I'm curious, do you find that this 8mb fastmem board fits with the 530? Are you using the usual relocator board?

The PLCC socket looks like it might be a little too tall?

John

SukkoPera · 12 June 2019, 14:48

I'm using a slightly different relocator (https://github.com/SukkoPera/Open68000Relocator) but it's identical in this regard. Everything fits tightly but it fits. I put some insulation tape under the TF530 just in case. I haven't tried to close the case yet though.

Mr.Flibble · 13 June 2019, 11:15

Did you manage to shrink the board enough to solve the cap bending issue (Either 816 or 307 - can't remember which one it was off the top of my head)?

I was thinking about tweaking the design to make it a non-issue

SukkoPera · 13 June 2019, 11:19

Mmmh, I didn't really pay attention to that (it's already a non-issue IMHO), but as you can see in the pics in the second post, no caps seem to be getting in the way on the A500.

Or did you mean on the A600?

project23 · 13 June 2019, 11:55

Quote:

Originally Posted by Mr.Flibble

Did you manage to shrink the board enough to solve the cap bending issue (Either 816 or 307 - can't remember which one it was off the top of my head)?

I was thinking about tweaking the design to make it a non-issue

It looks like the board is a tad shorter than the likes of the TF53x judging by from the pics.

SukkoPera · 13 June 2019, 11:58

Yes, it's 100x72 mm, I think the TF530 is 100x100.

project23 · 13 June 2019, 12:04

Quote:

Originally Posted by SukkoPera

Yes, it's 100x72 mm, I think the TF530 is 100x100.

Oh, what I mean is that on your board the 68k footprint looks like its a bit further 'down' than on the 530, so that when its in the 500 it misses the cap.

Mr.Flibble · 13 June 2019, 17:53

Quote:

Originally Posted by SukkoPera

Mmmh, I didn't really pay attention to that (it's already a non-issue IMHO), but as you can see in the pics in the second post, no caps seem to be getting in the way on the A500.

Or did you mean on the A600?

Nope, A500 - although it may be an issue with specific revisions - I know my 6a board had a cap I had to bend over to allow the relocator to sit properly.

Easy fix though if you do have a problem is to just replace the cap if you have one where the legs won't bend enough.

SukkoPera · 14 June 2019, 11:40

Yup, that's why I said it's a non-issue for me, most times you can just heat up the pads a bit and pull the legs up that bit that will allow you to lay the cap flat on the board, you don't even need to replace it.

Anyway, my pic above was taken on a rev. 6A, so it seems it's not an issue in any way

.

SukkoPera · 12 July 2019, 08:50

Just for information, I've done a small update to my OpenAmiga2000CoproAdapter, which should now be easier to plug in all the A2000s out there.

It is an Open Hardware adapter that allows installing the main processor of a Commodore Amiga 2000 computer in the co-processor slot.

katarakt · 31 July 2019, 18:47

SukkoPera, i'm going to build some A600 4mb ramexpansion. PCB's ordered. Everything is great, great docu, except there's no BOM list..why? I'm struggling figuring out all the parts. Costs much time. In the layout there are 74LS157 but on your picture you're using ACT157G ...so which one is better to use

SukkoPera · 31 July 2019, 19:45

BOM was released along with other files, check it out:

https://github.com/SukkoPera/OpenAmi...ion-1-bom.html

Wherever an LS is specified, HCT and ACT families should be fine as well. Choose what you can find more easily/cheaply.

katarakt · 31 July 2019, 19:53

...excellent. Thanks a lot

On little thing, BOM says in the upper line Rev 1 ...should be 1.2 or not?

SukkoPera · 31 July 2019, 19:56

Why? The latest revision of my board (and the only one so far) is V1.

katarakt · 06 August 2019, 22:05

Sukkopera, maybe you want to update your A600 FastRam Expansion to 8MB with jumper to toggle between 4 and 8mb? I found a project from the past where this was possible (A608 lvd.nedopc.com). Github A608 2008 design. Would be great if you can do this, your design is way better

. Maybe placing the other 4mb on the bottom side?

SukkoPera · 07 August 2019, 12:23

I don't really want to do that at the moment, as it's more like redesigning the whole thing from scratch rather than just updating it. I also feel that 4 MB are already enough for most tasks, at least for me.

katarakt · 08 August 2019, 19:21

Ok, i thought it's more like an update. So, no problem.

SukkoPera · 08 August 2019, 21:01

Not really, plus it would need to be re-engineered with a newer cpld which is easy to find nowadays (read: XC9572XL), so it's a real big big big job.

13 June 2019, 11:19	#26
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	Mmmh, I didn't really pay attention to that (it's already a non-issue IMHO), but as you can see in the pics in the second post, no caps seem to be getting in the way on the A500. Or did you mean on the A600? Last edited by SukkoPera; 13 June 2019 at 11:25.

08 August 2019, 21:01	#40
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	Not really, plus it would need to be re-engineered with a newer cpld which is easy to find nowadays (read: XC9572XL), so it's a real big big big job. Last edited by SukkoPera; 08 August 2019 at 21:10.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
sidecar ram, plus fast ram, chip ram behavior	kaluce	support.Hardware	6	21 May 2019 17:38
A600 multi-upgrade (Chip RAM + Fast RAM + ROM + IDE2CF)	Astrofra	Hardware pics	15	18 February 2014 21:27
A600 w/ 1MB Chip + 4MB Fast Ram = WHDLoad success rate?	Kenan	support.Hardware	7	08 May 2013 18:14
More Hardware for Zetro - A600 8mb fast ram ! (with love from Russia)	coze	Hardware mods	137	21 October 2009 22:54
WTB A500 Fast Ram Expansions	mfletcher	MarketPlace	2	05 July 2008 13:08

12 June 2019, 12:39	#21
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	It's here: https://www.exxoshost.co.uk/forum/vi...=1611&start=20

12 June 2019, 14:04	#23
project23 Used Register Join Date: Jul 2018 Location: Liverpool Age: 41 Posts: 437	Sukko, I'm curious, do you find that this 8mb fastmem board fits with the 530? Are you using the usual relocator board? The PLCC socket looks like it might be a little too tall? John

12 June 2019, 14:48	#24
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	I'm using a slightly different relocator (https://github.com/SukkoPera/Open68000Relocator) but it's identical in this regard. Everything fits tightly but it fits. I put some insulation tape under the TF530 just in case. I haven't tried to close the case yet though.

13 June 2019, 11:15	#25
Mr.Flibble Registered User Join Date: Jun 2015 Location: UK Posts: 472	Did you manage to shrink the board enough to solve the cap bending issue (Either 816 or 307 - can't remember which one it was off the top of my head)? I was thinking about tweaking the design to make it a non-issue

13 June 2019, 11:58	#28
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	Yes, it's 100x72 mm, I think the TF530 is 100x100.

14 June 2019, 11:40	#31
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	Yup, that's why I said it's a non-issue for me, most times you can just heat up the pads a bit and pull the legs up that bit that will allow you to lay the cap flat on the board, you don't even need to replace it. Anyway, my pic above was taken on a rev. 6A, so it seems it's not an issue in any way .

12 July 2019, 08:50	#32
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	Just for information, I've done a small update to my OpenAmiga2000CoproAdapter, which should now be easier to plug in all the A2000s out there. It is an Open Hardware adapter that allows installing the main processor of a Commodore Amiga 2000 computer in the co-processor slot.

31 July 2019, 18:47	#33
katarakt Registered User Join Date: Jul 2017 Location: Germany Posts: 205	SukkoPera, i'm going to build some A600 4mb ramexpansion. PCB's ordered. Everything is great, great docu, except there's no BOM list..why? I'm struggling figuring out all the parts. Costs much time. In the layout there are 74LS157 but on your picture you're using ACT157G ...so which one is better to use

31 July 2019, 19:45	#34
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	BOM was released along with other files, check it out: https://github.com/SukkoPera/OpenAmi...ion-1-bom.html Wherever an LS is specified, HCT and ACT families should be fine as well. Choose what you can find more easily/cheaply.

31 July 2019, 19:53	#35
katarakt Registered User Join Date: Jul 2017 Location: Germany Posts: 205	...excellent. Thanks a lot On little thing, BOM says in the upper line Rev 1 ...should be 1.2 or not?

31 July 2019, 19:56	#36
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	Why? The latest revision of my board (and the only one so far) is V1.

06 August 2019, 22:05	#37
katarakt Registered User Join Date: Jul 2017 Location: Germany Posts: 205	Sukkopera, maybe you want to update your A600 FastRam Expansion to 8MB with jumper to toggle between 4 and 8mb? I found a project from the past where this was possible (A608 lvd.nedopc.com). Github A608 2008 design. Would be great if you can do this, your design is way better . Maybe placing the other 4mb on the bottom side?

07 August 2019, 12:23	#38
SukkoPera Mighty Pirate Join Date: Dec 2017 Location: On the borderline Age: 44 Posts: 177	I don't really want to do that at the moment, as it's more like redesigning the whole thing from scratch rather than just updating it. I also feel that 4 MB are already enough for most tasks, at least for me.

08 August 2019, 19:21	#39
katarakt Registered User Join Date: Jul 2017 Location: Germany Posts: 205	Ok, i thought it's more like an update. So, no problem.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)