Project: Making A600 as A500-compatible as possible

8bitbubsy · 28 June 2010, 15:04

This would be a fun little project...

I have a rev 1 A600 with kickstart 1.3 and no RAM upgrades nor HDD, it's kind of good for old demos and stuff.... But I do get some glitches here and there, so I see it's not that compatible after all. I mean, quite often too, so there must be something in the newer platform design ruining the good old A500 compatibility. I've exchanged all the caps and stuff, so it's not that.

(Can I piggyback custom chips on top of others, or does this act as bitwise OR, thus the bottom chip will ruin it all?)
Any way to take a Denise from an A500, make a PLCC adapter and fit it in an A600? Same for Fat Agnus, if needed. Do you think this would solve the graphical glitches I am getting on certain demos?

Any ideas or comments on this? The only reason I have the A600 is because it's like a tiny A500, thus I want to make it as compatible as possible -- no matter what I have to do.

8bitbubsy · 28 June 2010, 15:07

Another thing to talk about: The memory configuration.
On a stock A600 the 1MB is configured as chip RAM -- any way to route the second half (512kB) as fake-fast, just as the A500...? Or doesn't this have anything to say in compatibility?

musashi5150 · 28 June 2010, 17:08

I know if you bought one of the A608 RAM expansions in some of the configs you can map RAM to $c00000 a la A500 trapdoor

8bitbubsy · 28 June 2010, 17:09

Quote:

Originally Posted by musashi5150

I know if you bought one of the A608 RAM expansions in some of the configs you can map RAM to $c00000 a la A500 trapdoor

I do only have Indivision A603 ...

Toni Wilen · 28 June 2010, 17:22

Possibly not common OCS/ECS Agnus difference but can't be sure without names of demos.. (This isn't A600vsA500 difference, A500 with ECS Agnus have same isues)

1M chip RAM (without any slow ram) generally causes only stupid "get 512k expansion, not enough ram" messages.

cosmicfrog · 29 June 2010, 06:55

2 memory progs I found on aminet that fool ami with chip ram that it has some fast
http://aminet.net/package/util/boot/halfnhalf
http://aminet.net/package/util/misc/Fakemem

never used these progies and it probable that they only work with os friendly code

zipper · 29 June 2010, 08:23

I think most degraders could make chip to fake fast; just used Degrader and TUDE and I think they both did it and kept it reset resident for floppy games.

28 June 2010, 15:04	#1
8bitbubsy Registered User Join Date: Sep 2009 Location: Norway Posts: 1,711	Project: Making A600 as A500-compatible as possible This would be a fun little project... I have a rev 1 A600 with kickstart 1.3 and no RAM upgrades nor HDD, it's kind of good for old demos and stuff.... But I do get some glitches here and there, so I see it's not that compatible after all. I mean, quite often too, so there must be something in the newer platform design ruining the good old A500 compatibility. I've exchanged all the caps and stuff, so it's not that. (Can I piggyback custom chips on top of others, or does this act as bitwise OR, thus the bottom chip will ruin it all?) Any way to take a Denise from an A500, make a PLCC adapter and fit it in an A600? Same for Fat Agnus, if needed. Do you think this would solve the graphical glitches I am getting on certain demos? Any ideas or comments on this? The only reason I have the A600 is because it's like a tiny A500, thus I want to make it as compatible as possible -- no matter what I have to do. Last edited by 8bitbubsy; 28 June 2010 at 15:12.

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28 June 2010, 15:07	#2
8bitbubsy Registered User Join Date: Sep 2009 Location: Norway Posts: 1,711	Another thing to talk about: The memory configuration. On a stock A600 the 1MB is configured as chip RAM -- any way to route the second half (512kB) as fake-fast, just as the A500...? Or doesn't this have anything to say in compatibility?

28 June 2010, 17:08	#3
musashi5150 move.w #$4489,$dff07e Join Date: Sep 2005 Location: Norfolk, UK Age: 42 Posts: 2,351	I know if you bought one of the A608 RAM expansions in some of the configs you can map RAM to $c00000 a la A500 trapdoor

28 June 2010, 17:22	#5
Toni Wilen WinUAE developer Join Date: Aug 2001 Location: Hämeenlinna/Finland Age: 49 Posts: 26,519	Possibly not common OCS/ECS Agnus difference but can't be sure without names of demos.. (This isn't A600vsA500 difference, A500 with ECS Agnus have same isues) 1M chip RAM (without any slow ram) generally causes only stupid "get 512k expansion, not enough ram" messages.

29 June 2010, 06:55	#6
cosmicfrog The 1 who ribbits Join Date: Apr 2006 Location: leek, Staffs, UK Age: 56 Posts: 3,557	2 memory progs I found on aminet that fool ami with chip ram that it has some fast http://aminet.net/package/util/boot/halfnhalf http://aminet.net/package/util/misc/Fakemem never used these progies and it probable that they only work with os friendly code

29 June 2010, 08:23	#7
zipper Registered User Join Date: Mar 2004 Location: finland Posts: 1,838	I think most degraders could make chip to fake fast; just used Degrader and TUDE and I think they both did it and kept it reset resident for floppy games.

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