My only ASIC has exactly the same fault. Frustratingly it developed it on a Sam I'd bought from eBay only about four months before to replace the childhood one that's now long lost. That was about three or four years and I paid something like £100; looking now the two available seem to be £500 and £700, though neither appears to be moving at those prices. Is that really how much I should expect to pay if I ever need a third?
On 12 June 2012 08:51, Leszek Chmielewski <retr...@gmail.com> wrote: > I have a faulty ASIC, which displays no BRIGHT signal, so only 64 colours > available. But I need a working ASIC first, before I can donate mine. > > LCD > > Am 10.06.2012 22:52, schrieb Thomas Harte: > >> Maybe we should get some samples sent into the guys at visual6502.org >> who, despite the name, are attempting to image large swathes of old 8 >> bit ICs. See http://visual6502.org/donate_hw.html — they seem fine >> with broken hardware so does anybody have any faulty ASICs? Or spares? >> Possibly even just for sale rather than donation? >> >> On 10 June 2012 08:02, Adrian Brown<adr...@apbcomputerservices.co.uk> >> wrote: >>> >>> A nice pdf of the logic gate layout would be nice ... ;) >>> >>> -----Original Message----- >>> From: owner-sam-us...@nvg.ntnu.no [mailto:owner-sam-us...@nvg.ntnu.no] >>> On Behalf Of Tommo H >>> Sent: 10 June 2012 04:31 >>> To: sam-users@nvg.ntnu.no >>> Subject: Good resources for learning about the ASIC? >>> >>> I'm currently partway through The ZX Spectrum ULA: How To Design a >>> Microcomputer, which is the book partly researched by photographing and >>> reconstructing the exact IC layout of the Spectrum's ULA. So it goes >>> into a lot of detail about how ICs were produced in general, the nature >>> of ULAs, the Spectrum's design constraints, how they therefore ended up >>> laying things out and all that sort of stuff. As someone who has >>> previously looked no lower than product data sheets it's fascinating. >>> >>> Does anyone know of any similar sort of details about the Sam's ASIC? >>> Presumably it's a similar process - application-specific interconnects >>> added to a generic, previously manufactured base - but benefitting from >>> seven years of advances in density? Though the Sam's design process >>> seems to have been quite extended, so maybe they used some other >>> process? >>> >>> I guess nobody has the resources to have photographed one but what >>> documentation do we have? Google's not turning much up. >>> >>> >>> >
