PCW RAM

Started by Charlie, 19:35, 18 September 19

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Charlie

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.
Charlie.

Are you pondering what I'm pondering? The Qube Server

GUNHED

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.

http://futureos.de --> Get the revolutionary FutureOS (Update: 2022.03.09)
http://futureos.cpc-live.com/files/LambdaSpeak_RSX_by_TFM.zip --> Get the RSX-ROM for LambdaSpeak :-) (Updated: 2021.12.26)

torrind

Agreed, this looks quite exciting - Battery backup M: drive  :o  count me in.


Darren

GeoffB17

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

JonB

#4
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
]

GUNHED

Quote from: GeoffB17 on 02:02, 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.
http://futureos.de --> Get the revolutionary FutureOS (Update: 2022.03.09)
http://futureos.cpc-live.com/files/LambdaSpeak_RSX_by_TFM.zip --> Get the RSX-ROM for LambdaSpeak :-) (Updated: 2021.12.26)

JonB

What CPM Plus apps actually use it though?

GUNHED

Quote from: JonB on 19:42, 19 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 (Update: 2022.03.09)
http://futureos.cpc-live.com/files/LambdaSpeak_RSX_by_TFM.zip --> Get the RSX-ROM for LambdaSpeak :-) (Updated: 2021.12.26)

JonB

A general question for the benefit of Geoff and others who might be considering this upgrade.


GUNHED

Of, course.  :)  IMHO the software will come as soon as the hardware is available.  :)
http://futureos.de --> Get the revolutionary FutureOS (Update: 2022.03.09)
http://futureos.cpc-live.com/files/LambdaSpeak_RSX_by_TFM.zip --> Get the RSX-ROM for LambdaSpeak :-) (Updated: 2021.12.26)

JonB

Is that the sound of a gauntlet being thrown down, I wonder?

;)

Charlie

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.

Are you pondering what I'm pondering? The Qube Server

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