Author Topic: PCW RAM  (Read 415 times)

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Offline Charlie

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PCW RAM
« on: 19:35, 18 September 19 »
Hello all,
It's been an absolute age since I showed my face round here - sorry about that.I've had a few projects on the boil but sadly can't afford to actually make / test them so I thought I'd post them all here in case anyone wants to run with any of them.

#5) PCW RAM Board
In line with my previously posted PCW expansion board here's a 2Mb RAM card for the PCW. Again, internal or external fitment. Assuming it works at all I've added the option for two further 2Mb banks of RAM at a couple of other memory addresses.
Oh, and as the PCW mostly uses the extra RAM for an M: drive I added battery backup too.

Quite untested so use at your discretion.

...and I think that's me done for the time-being. I hope somebody finds these designs useful.

All the best,
Charlie.
« Last Edit: 19:44, 18 September 19 by Charlie »
Charlie.

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Offline GUNHED

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Re: PCW RAM
« Reply #1 on: 20:39, 18 September 19 »
Amazing! 2 MB with battery back up! Great!  :) :) :)


If somebody is going to build them I would like to take two of them. Together production costs shall drop.

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Offline torrind

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Re: PCW RAM
« Reply #2 on: 00:48, 19 September 19 »
Agreed, this looks quite exciting - Battery backup M: drive  :o  count me in.


Darren

Offline GeoffB17

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Re: PCW RAM
« Reply #3 on: 02:02, 19 September 19 »
Very impressed with the work done by Charlie, but since I got JonB's xIDE drive attached I make hardly any use of RAM disk any more.  So much more space available on any of the C: thru P: drives, up to 8Mb on each, and automatically saved regardless of battery backup.  Also, access to this 'virtual' HD space is pretty much as fast as access to the RAM disk, so I no longer have any need to transfer stuff to M: for purposes of speed - almost all of my boot-up files (that once were copied to M: ) now just stay on C:.

So really no need to a 2Mb battery backed RAM drive.   It would have been GREAT before though!!

Geoff

Offline JonB

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Re: PCW RAM
« Reply #4 on: 11:27, 19 September 19 »
Yes I've been following this with great interest... :)

Charlie's IDE section looks just like mine.. but there you go, there aren't that many ways to connect an IDE device to a Z80 bus, and my design is itself derived from some other design.

Anyway.. as I have recently retired I should have more time on my hands. Charlie seems to have done some interesting work, so if #4 is the expansion board and #5 the RAM board, what are #1, #2 and #3? I am looking for candidate boards to connect to the Z80 bus... but most of all I want the IDE boot board. I still have not worked it out!

As to these other boards, I could go into production if Charlie is happy. As the designs are untested there is still a bit of work to do. And I would want to redo the PCB layouts so that they are compatible with the Z80 bus, and can be programmed for I/O address like uIDE.

[Edit:
#1: http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/cpc-8255-ide/msg178236 CPC464 IDE
#2: http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/cpc-512k-expansion/msg178238 CPC 512k RAM
#3: http://www.cpcwiki.eu/forum/amstrad-cpc-hardware/z80-accelerator/msg178239 Z80 accelerator
]
« Last Edit: 11:42, 19 September 19 by JonB »

Offline GUNHED

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Re: PCW RAM
« Reply #5 on: 18:43, 19 September 19 »
So really no need to a 2Mb battery backed RAM drive.   It would have been GREAT before though!!

Geoff
This RAM can be used for everything, not only as RAM disc.
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Offline JonB

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Re: PCW RAM
« Reply #6 on: 19:42, 19 September 19 »
What CPM Plus apps actually use it though?

Offline GUNHED

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Re: PCW RAM
« Reply #7 on: 16:30, 20 September 19 »
What CPM Plus apps actually use it though?


Why should I care? My own apps can use it.
http://futureos.de --> Get the revolutionary FutureOS (Recent update: 2019.08.07)
http://futureos.cpc-live.com/files/LambdaSpeak_RSX_by_TFM.zip --> Get the RSX-ROM for LambdaSpeak :-) (Updated: 2019.08.14)

Offline JonB

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Re: PCW RAM
« Reply #8 on: 10:25, 21 September 19 »
A general question for the benefit of Geoff and others who might be considering this upgrade.


Offline GUNHED

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Re: PCW RAM
« Reply #9 on: 13:56, 21 September 19 »
Of, course.  :)  IMHO the software will come as soon as the hardware is available.  :)
http://futureos.de --> Get the revolutionary FutureOS (Recent update: 2019.08.07)
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Offline JonB

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Re: PCW RAM
« Reply #10 on: 21:30, 21 September 19 »
Is that the sound of a gauntlet being thrown down, I wonder?

 ;)

Offline Charlie

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Re: PCW RAM
« Reply #11 on: 17:39, 22 September 19 »
Thanks for the kind feedback chaps. :-)
Certainty I would hope some might find this a good starting point for their own projects, sadly as I'm out of funds I doubt I'll be perusing any of the designs I recently posted hence the reason for sharing.


To reiterate this is wholly untested so if anyone does have a go PLEASE be sure to check the design VERY carefully BEFORE making one.


All the best,C.
Charlie.

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