This machine is just my A540+4M, its got two thin drives sandwiched into the drive bay. RISC iX would have been copied from an Acorn Melbourne demo R260 while I worked there.
It not been in storage but it doesn't get a lot of use, I used it last year as I finally got round to fixing my IO Podule for ARM3 by changing the 65C22 and its the last machine I have that podule would fit. Its also the last machine I have that is ARM and has an ADF10 socket.
Annoyingly it was working as well as its ever done which is to say randomly crashing has always been in its nature*, before I pulled it all apart and removed the battery & replaced it with an off board one. Its not booted again after that, so I think some track were only held together by the corrosion. It wasn't bad compared to some pix I have seen here but its still going to take some fixing so its on the rainy day pile for now.
Alan
*Its interesting that the Wikipedia page claims that early machines were 24MHz and later ones were 30Mhz which I think is completely the wrong way round. Mine was hand picked from early stock to ensure I got a 30MHz one. I think they lowered the frequency to increase the yield of usable chips. I have always suspected that this machines predisposition for unreliable behavior could be due to this. I suppose I could have just changed the crystal but that has only just occurred to me.
It not been in storage but it doesn't get a lot of use, I used it last year as I finally got round to fixing my IO Podule for ARM3 by changing the 65C22 and its the last machine I have that podule would fit. Its also the last machine I have that is ARM and has an ADF10 socket.
Annoyingly it was working as well as its ever done which is to say randomly crashing has always been in its nature*, before I pulled it all apart and removed the battery & replaced it with an off board one. Its not booted again after that, so I think some track were only held together by the corrosion. It wasn't bad compared to some pix I have seen here but its still going to take some fixing so its on the rainy day pile for now.
Alan
*Its interesting that the Wikipedia page claims that early machines were 24MHz and later ones were 30Mhz which I think is completely the wrong way round. Mine was hand picked from early stock to ensure I got a 30MHz one. I think they lowered the frequency to increase the yield of usable chips. I have always suspected that this machines predisposition for unreliable behavior could be due to this. I suppose I could have just changed the crystal but that has only just occurred to me.
Statistics: Posted by awilliams — Thu Feb 01, 2024 3:33 am