Want to make an A500 1mb expansion board

kipper2k · 01 January 2014, 18:02

Hi All,

Does anyone know of any schematics for a 1MB chipmem expansion board for the A500, I'd like to make some boards up. I think there would be a demand for them ?

fitzsteve · 01 January 2014, 18:12

With the ACA500 out there's good demand now for anything A500!

Would you be making a 1mb upgrade that's fully chip Ram for A500+? These are the ones that usually carry a premium!

kipper2k · 01 January 2014, 18:29

Quote:

Originally Posted by fitzsteve

With the ACA500 out there's good demand now for anything A500!

Would you be making a 1mb upgrade that's fully chip Ram for A500+? These are the ones that usually carry a premium!

Hi Steve,

The a500+ is the main reason to make this so people can get the 2mb chipmem. Even if i can get my hands on an old broken one could be good enough to get the job done.

Jope · 01 January 2014, 18:46

Kipper2k, you can look at the a500 and a500+ schematics, the 1MB and 2MB Agnus pinouts are explained there along with the RAS and CAS routings.

http://www.1000bit.it/support/manual...500plus_sm.pdf
http://www.amigawiki.de/dnl/schematics/A500_R6.pdf

kipper2k · 01 January 2014, 18:55

Thanks Jope,

the first link has a schematic for a 1mb expansion. i'll check out parts availability

Jope · 01 January 2014, 20:09

Ah yes, if you're targeting the A500+ then "all" you need to do is to hook up the RAM to the trapdoor slot. Add some decoupling capacitors and you're golden. ;-)

I originally thought you were going to create a 2MB Agnus adapter for the Rev6 mobo.

roy bates · 01 January 2014, 21:09

you know if you make it with sockets or something you could use it half populated on the 500 as well,just a thought.

kipper2k · 01 January 2014, 22:48

Quote:

Originally Posted by roy bates

you know if you make it with sockets or something you could use it half populated on the 500 as well,just a thought.

yah, sockets is good, especially for repair etc

roy bates · 02 January 2014, 12:01

Quote:

Originally Posted by kipper2k

yah, sockets is good, especially for repair etc

yep,makes it a tad more expensive i suppose but worth it.
you could mark the pcb sockets for population for different machines(512k and 1mb or 0 and 1),a few manufacturers used to do it this way.

duga · 02 January 2014, 12:06

And maybe RTC as an option:
0.5 MB + RTC
1 MB, no RTC

kipper2k · 02 January 2014, 13:52

Quote:

Originally Posted by duga

And maybe RTC as an option:
0.5 MB + RTC
1 MB, no RTC

I think once the memory was done, the selectable mem/RTC config options would be simple

alenppc · 02 January 2014, 21:13

@kipper, I believe that in the A500 pack I sent you a while ago there was a 500+ 1 MB chip expansion as well, so you might want to check that one out.

kipper2k · 17 March 2015, 15:23

I will release the 1mb chipmem board for the a500+ hopefully next week, it has RTC onboard (ideal for those a500+ boards that have the corroded battery circuit) and will take your A500+ to 2MB chipmem total. This board should also provide an extra 512k fastmem/chipmem to earlier revision boards... pictures to follow soon.

the board is a bit smaller than my a600 1mb board.

I also updated my webpage too. www.kipper2k.com

alexh · 17 March 2015, 19:56

Quote:

Originally Posted by kipper2k

I also updated my webpage too. www.kipper2k.com

But not the link in your signature :-P

Lord Aga · 17 March 2015, 20:04

Quote:

Originally Posted by Jope

I originally thought you were going to create a 2MB Agnus adapter for the Rev6 mobo.

Me too

Quote:

Originally Posted by kipper2k

ideal for those a500+ boards that have the corroded battery circuit) and will take your A500+ to 2MB chipmem total.

I don't know about a corroded circuit, but my A500+ simply has its battery removed. Would this expansion board give me the clock simply by plugging it in, or do I have to cut some traces first ? Remove chips... Disable the reactor...

EDIT:
Ah, never mind, I've just read the description on your page. So a solder blob is in order, eh

Zippy Zapp · 25 March 2015, 21:04

Sounds cool and nice price!

Any plans on doing a A1200 FastRAM expansion w/RTC?

Thanks!

Photon · 25 March 2015, 22:22

Always nice with more memory, even if on A500+ I guess you can get 1.5MB just by sticking any trapdoor expansion in?

Good initiative with the battery/RTC (modless and socketed battery?)

About the A500, is there any way you could make a 2MB board that the ACA500 tolerates? It would be yummy

zharn · 26 March 2015, 03:25

Ive got an 1mb 500+ expansion unit, ill confirm im getting 2mb chip on the 500+ and send some photos

Sandro · 26 March 2015, 06:06

2mb chip on the A500 is useless
1mb chip for the A500 is enough for all games and apps

there is only 2 ECS games that requires 2mb chip ram: are "wasted dreams" and "Code name Hell Squad"

Jope · 26 March 2015, 08:51

Yeah, but what about those of us who aren't game lamers and want to do stuff that doesn't fit into 1MB of chip ram? ;-)

01 January 2014, 18:02	#1
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	Want to make an A500 1mb expansion board Hi All, Does anyone know of any schematics for a 1MB chipmem expansion board for the A500, I'd like to make some boards up. I think there would be a demand for them ?

17 March 2015, 15:23	#13
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	I will release the 1mb chipmem board for the a500+ hopefully next week, it has RTC onboard (ideal for those a500+ boards that have the corroded battery circuit) and will take your A500+ to 2MB chipmem total. This board should also provide an extra 512k fastmem/chipmem to earlier revision boards... pictures to follow soon. the board is a bit smaller than my a600 1mb board. I also updated my webpage too. www.kipper2k.com Last edited by kipper2k; 17 March 2015 at 15:31.

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01 January 2014, 18:12	#2
fitzsteve Professional slacker! Join Date: Jul 2009 Location: Kent, UK Age: 44 Posts: 6,685	With the ACA500 out there's good demand now for anything A500! Would you be making a 1mb upgrade that's fully chip Ram for A500+? These are the ones that usually carry a premium!

01 January 2014, 18:46	#4
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,884	Kipper2k, you can look at the a500 and a500+ schematics, the 1MB and 2MB Agnus pinouts are explained there along with the RAS and CAS routings. http://www.1000bit.it/support/manual...500plus_sm.pdf http://www.amigawiki.de/dnl/schematics/A500_R6.pdf

01 January 2014, 18:55	#5
kipper2k Registered User Join Date: Sep 2006 Location: Thunder Bay, Canada Posts: 4,323	Thanks Jope, the first link has a schematic for a 1mb expansion. i'll check out parts availability

01 January 2014, 20:09	#6
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,884	Ah yes, if you're targeting the A500+ then "all" you need to do is to hook up the RAM to the trapdoor slot. Add some decoupling capacitors and you're golden. ;-) I originally thought you were going to create a 2MB Agnus adapter for the Rev6 mobo.

01 January 2014, 21:09	#7
roy bates Registered User Join Date: Apr 2011 Location: birmingham Age: 55 Posts: 2,827	you know if you make it with sockets or something you could use it half populated on the 500 as well,just a thought.

02 January 2014, 12:06	#10
duga Registered User Join Date: Nov 2010 Location: Sweden Posts: 528	And maybe RTC as an option: 0.5 MB + RTC 1 MB, no RTC

02 January 2014, 21:13	#12
alenppc Registered User Join Date: Apr 2012 Location: Canada Age: 44 Posts: 910	@kipper, I believe that in the A500 pack I sent you a while ago there was a 500+ 1 MB chip expansion as well, so you might want to check that one out.

25 March 2015, 21:04	#16
Zippy Zapp Registered User Join Date: Sep 2013 Location: CA/USA Posts: 346	Sounds cool and nice price! Any plans on doing a A1200 FastRAM expansion w/RTC? Thanks!

25 March 2015, 22:22	#17
Photon Moderator Join Date: Nov 2004 Location: Eksjö / Sweden Posts: 5,647	Always nice with more memory, even if on A500+ I guess you can get 1.5MB just by sticking any trapdoor expansion in? Good initiative with the battery/RTC (modless and socketed battery?) About the A500, is there any way you could make a 2MB board that the ACA500 tolerates? It would be yummy

26 March 2015, 03:25	#18
zharn Registered User Join Date: Nov 2012 Location: Brisbane Australia Posts: 150	Ive got an 1mb 500+ expansion unit, ill confirm im getting 2mb chip on the 500+ and send some photos

26 March 2015, 06:06	#19
Sandro Banned Join Date: Feb 2013 Location: spain Posts: 897	2mb chip on the A500 is useless 1mb chip for the A500 is enough for all games and apps there is only 2 ECS games that requires 2mb chip ram: are "wasted dreams" and "Code name Hell Squad"

26 March 2015, 08:51	#20
Jope - Join Date: Jul 2003 Location: Helsinki / Finland Age: 43 Posts: 9,884	Yeah, but what about those of us who aren't game lamers and want to do stuff that doesn't fit into 1MB of chip ram? ;-)

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