Posted By
MMS
on 2018-12-03
18:19:19
 |  Re: Noob question about ram packs
I had a C16 in my childhood, and it was upgraded internally with a switch on the back.
(you know,some extra wires, cutting two tracks, etc)
I also did not really like drilling a hole, but it worked, and made professionally.
But I was always sure there should be JUST an extenal cartride, and Kingsoft is one of the examples. I am aware, that there were at least three or four different Hungarian made cartridges, and later on I personally saw few of them on Computer Christmas, mayb ~92.
On the Facebook forum there was a lt of discussion about this topic, and someone had some success, but it seems it worked only on NTSC machines.
Probably the DRAM updates (timing comes from TED?) had some issues when used with PAL machine, who knows, I am not an expert.
Anyone able to contact Solder?
He made RAM expansion to Plus/4, although I think he used Static RAM, they do not need refresh.
That may work with NTSC and PAL machines too. The speed of them is a questionmark for me, though. Mainly they are used as a RAM disc/backup (can keep their content with a battery), but I see no reason, why could not be used as a normal RAM, though they are typically more expensive than DRAM (like 41464)
A list of 64x4 DRAM version with different speeds:
http://www.amiga-stuff.com/hardware/64kx4-dram.html
I think I had some 41464 in my very old Trident card (in sockets), but probably sold them maybe 10 years ago.
I just found an interesting PCB with low power Static RAMs to replace the old 150ns 4532s used in ZX Spectrum upper 32K RAM, and equivalent to the 4164...
https://www.retroleum.co.uk/uploads/images/spectrum-upper_ram_pcb-only.pdf
Certainly the layout is different (?) but a nice idea.
https://www.retroleum.co.uk/zx-spectrum-chips
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