Author Topic: How much RAM does your CPC have?  (Read 8546 times)

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Offline MiguelSky

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Re: How much RAM does your CPC have?
« Reply #25 on: 20:24, 01 July 10 »
Hi :)
 
Well, I voted too. 64 Kb + 512Kb from Symbiface or Inicrom RamBOX in all my CPCs (all the models except 664). My neighbourhood were 464 in almost all of the cases. I think this is the great forgotten model today. The newest ultrafast cassete loaders are fine but a rom/cartridge/hdd based solution would be great for this models. I think it would atract more (re)new CPC users.

Offline Axelay

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Re: How much RAM does your CPC have?
« Reply #26 on: 11:45, 02 July 10 »
@axelay: I think quite more than 8-10 mins!

Made some mock tape images of Star Sabre 128k (wouldn't really load as it's still the disk loader, but the wav file length is all that matters)  It's about 120kb all up, and at 2000bd with headerless files it is less than 10 minites!  Not sure how reliable that'd be.  At 1000bd with headerless files it was about 15 minutes, and for fun, 1000bd with the standard 2kb blocks was over 23 minutes.  Joy!

Offline arnoldemu

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Re: How much RAM does your CPC have?
« Reply #27 on: 12:06, 02 July 10 »
Bank switching is great, but the video RAM in central memory is a dick move IMO...
It would be interesting if some kind of blitter or dma could be linked to the cpc with the possibility of transfering graphics from extra ram to main ram. Or possibly a simple hardware I/O mod where you could set the CPC video hardware to use extra ram somehow.

A kind of switch on/off which 64k bank it could use.

Not sure if that is possible or not.
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Offline fano

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Re: How much RAM does your CPC have?
« Reply #28 on: 12:53, 02 July 10 »
Or possibly a simple hardware I/O mod where you could set the CPC video hardware to use extra ram somehow.
That was clearly a missing thingie in 6128 design !
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Offline ukmarkh

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Re: How much RAM does your CPC have?
« Reply #29 on: 15:48, 02 July 10 »
It would be interesting if some kind of blitter or dma could be linked to the cpc with the possibility of transfering graphics from extra ram to main ram.


It's funny you should say that, I remember that one of the original designers wanted to include a Blitter into the design of the CPC. Apparently it would have cost an extra 30p to include it, but I guess nobody listened. 

Offline ivarf

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Re: How much RAM does your CPC have?
« Reply #30 on: 16:05, 02 July 10 »

It's funny you should say that, I remember that one of the original designers wanted to include a Blitter into the design of the CPC. Apparently it would have cost an extra 30p to include it, but I guess nobody listened.

Was that the 6502 CPC?

Offline ukmarkh

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Re: How much RAM does your CPC have?
« Reply #31 on: 18:42, 02 July 10 »
I was intended for the Z80 build... maybe it was an idea brought over from the 6502 design. 

Offline Devilmarkus

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Re: How much RAM does your CPC have?
« Reply #32 on: 19:02, 02 July 10 »

It's funny you should say that, I remember that one of the original designers wanted to include a Blitter into the design of the CPC. Apparently it would have cost an extra 30p to include it, but I guess nobody listened.

Hehehe is that the free unsoldered IC socket on the PCB?  :police:

(I know it isn't) :(

But would be funny, a CPC with Blitter...
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Offline MacDeath

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Re: How much RAM does your CPC have?
« Reply #33 on: 21:56, 02 July 10 »
What would a blitter do on a CPC ?

Offline fano

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Re: How much RAM does your CPC have?
« Reply #34 on: 22:27, 02 July 10 »
What would a blitter do on a CPC ?
Same thing like on other machines , accelerating a lot rendering operations  :-*
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Offline TFM

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Re: How much RAM does your CPC have?
« Reply #35 on: 22:30, 02 July 10 »
It would be interesting if some kind of blitter or dma could be linked to the cpc with the possibility of transfering graphics from extra ram to main ram. Or possibly a simple hardware I/O mod where you could set the CPC video hardware to use extra ram somehow.

A kind of switch on/off which 64k bank it could use.

Not sure if that is possible or not.

There is one way to do it, use the c't 512 KB expansion. Some infos are in the Wiki, some infos are corrupted by ... forgot his pseude ;-) But this expansion enebles you to use a lot of screen RAM. I've seen it working that way.
 
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Offline Gryzor

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Re: How much RAM does your CPC have?
« Reply #36 on: 10:04, 05 July 10 »
A blitter in the original CPC? I think it was considered for the Plus series...

Offline arnoldemu

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Re: How much RAM does your CPC have?
« Reply #37 on: 11:40, 05 July 10 »

There is one way to do it, use the c't 512 KB expansion. Some infos are in the Wiki, some infos are corrupted by ... forgot his pseude ;-) But this expansion enebles you to use a lot of screen RAM. I've seen it working that way.
I did think of this expansion when I made this post ;)

This one involves internal changes? It would be great if an external ram expansion could be made with the same kind of effects, but I think this is not possible because of the cpc bus design.
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Offline TFM

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Re: How much RAM does your CPC have?
« Reply #38 on: 01:17, 06 July 10 »
I did think of this expansion when I made this post ;)

This one involves internal changes? It would be great if an external ram expansion could be made with the same kind of effects, but I think this is not possible because of the cpc bus design.

Yes right, or like people say in your wonderful language: "You really put the finger in the wound". Since the CRTC is only connected to the firtst 64 KB of the internal RAM (and the CRTC has no direct connection to the expansion bus, disregarding the Light-Pen thing) there is no way around. But...
 
... what maybe - in theory - could be done.... would be a small board, which takes up the Z80 of the CPC. The board is connected to the socket, where the Z80 was before.
 
On this board you can place memory, CRTC-accessible memory and - my personal dream - a Z80-DMA (or a more modern DMA chip).
 
If I see how much space (neraly nothing!!!) Jareks 4 MB expansion in my CPC needs, it all should be doable. But you need somebody with time & knowledge to make that hardware stuff.
 
So... who like to do it? Anybody here???
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Offline MacDeath

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Re: How much RAM does your CPC have?
« Reply #39 on: 09:34, 06 July 10 »
My brother was interested in emulating the CRTC with a fpga in order to emulate crtc but having a VGA output...

the aim would then be to put a socket in place of the CRTC (remove it then) and put a card with the fpga on this socket, also connected to whatever wewould want (a vga output per exemple)


but this is a custom cpc so no body would actually use tthis kind of stuff for his games or softs...


IMO instead of trying to implement hardware modification of good old CPC mainboards, we should better think about a FPGA _ one chip solutionfor a new Amstrad CPC generation.


Symbos mens did one if i rememberr well.

I know Amiga or Atari ST do exist in one chip solution...


Would be the easiest solution to get a CPCand Plus and many memory and even more additionnal features... in one chip, sort of.


But hey, I must first try to get an ACID solution, and then an extension card with memory and a FPGA abe to produce multiple existing extensions through reprogrammation.

So concerning existing CPC, appart from more RAM, advanced mass media (ROM, HDD, CDROM or Network) and of course sounds (voice samplers, additionnal AY...) Ican't see any interesting stuff.

Main problem being finding a connectic solution...perhaps.

And a costwise solution/design too.

Offline TFM

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Re: How much RAM does your CPC have?
« Reply #40 on: 23:54, 06 July 10 »
I know Amiga or Atari ST do exist in one chip solution...

Well, there are two solutions, but both have their caviots and pitfalls:
 
- The C-One
 
- The T-Rex1
 
The ASIC & ACID can be implemented in FPGA. (If you find someone who is able to deal with this stuff).
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