Hithe notches in pci connectors signify the signalling voltage to use.. notch nearest card backpanel = 3.3v signalling (iyonix) .. notch furthest from panel = 5v signalling. (legacy PC and badly built cards)
both notches.. will adapt as required. iyonix HAS to use 3v3 signalling as the cpu cannot handle 5v signals safely.as a matter of interest.. some of the cards used in production iyo machines arrive with us without the proper key slot; I mill the relevant slot once I am happy the card design and chips on it will behave correctly at 3v3 signalling.
John Barrie McElroy wrote:
PCI or not PCI? That is the question At least the question is more like: Are there different versions of PCI expansion slots and cards that fit them? I do not mean PCI-e. At least I am fairly sure I do not. That seems quite a bit different. I have put up an hasty HTML page with illustrations to help explain this issue. http://www.mcelroy.com.au/iyonix/ After upgrading to RISC OS 5.12\5·13 I went looking for a new PCI graphics card. I discovered that in Australia by the time 5.12 had been produced that no-one had make\imported the FX series for about 18 months as it was 'out-dated'. After having several firms digging on back shelves and in warehouses I eventually bought a simple, but effective, 128MB card branded XFX. (See Figure 1) It lacked the DVI out I had sought, but it works well.The Iyonix PCI expansion slots are shown in Figure 2. Note the matchbetween the notches and the slots.So what is the problem? I hear the reader ask.Still seeking a DVI outlet I found another card with what seemed good specifications. It was advertised as being: GeForce RX5500 256MB 128bit DDR PCI DVI TV-out Heatsink (inter alia). I asked questions of retailers. I checked the manufacturer's site. viz: http://www.inno3d.com/products/graphic_card/gf_fx/5500.htmAmong other things, understood or not, it told me: "A PCI compliant motherboard with full size expension (sic) slot for PCIversion"I had my current card in one of those (I thought) so I took the plungeand bought the card shown in Figure 3.I soon discovered that my shiny new FX550 appeared to be lacking a notch? A quick peek in the side of my PC showed that it had a different style of PCI slot (Figure 4) which would match the new card. The card will not physically fit the Iyonix.Two types of PCI expansion slots?Are there two types of PCI expansion cards? If it is meant to fit theback notch then the face plate fouls the motherboard. - Is my new card something different (i.e. not PCI)?- Is this another case of RISC OS being years behind when it used to be years ahead?- Is there a solution to my dilemma or is it a tiny boat anchor?
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