Bryan Posted March 11, 2006 Share Posted March 11, 2006 I was looking at the XF551 schematic from J Sobola's site, and I noticed it was quite a bit different from mine. Can anyone post a picture of their XF551 main board as I'm trying to track down what the different versions were. -Bry Quote Link to comment Share on other sites More sharing options...
krupkaj Posted March 11, 2006 Share Posted March 11, 2006 I have just upgraded to HyperXF ROM, so it is not problem to make a picture Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 11, 2006 Author Share Posted March 11, 2006 I have just upgraded to HyperXF ROM, so it is not problem to make a picture 1032015[/snapback] Cool.. thanks. Yours looks like mine (right down to the jumper because they wired the switch backwards). The schematic shows a 330 ohm resistor in R12, but it looks like you've got a 220 like me. Also, it shows a crystal oscillator circuit but we both have a one-piece TTL oscillator instead. What was your old ROM version? Mine was 7.4. -Bry Quote Link to comment Share on other sites More sharing options...
krupkaj Posted March 11, 2006 Share Posted March 11, 2006 I have it dumped here. But I do not know which bytes in image is version. Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 11, 2006 Author Share Posted March 11, 2006 I don't know how to tell either. Mine had a label that said 7.4. The ROM looks to be half empty (or half full). -Bry Quote Link to comment Share on other sites More sharing options...
krupkaj Posted March 11, 2006 Share Posted March 11, 2006 (edited) aha, mine has EPROM without any number. And yes there is only 4 KB of code. There is also A12 of ROM connected to GND so it is in not possible to read more than 4 KB without mod. I am thinking about simple mod with switch so I can have original ROM and HyperXF in one 27C64. Edited March 11, 2006 by krupkaj Quote Link to comment Share on other sites More sharing options...
Bryan Posted March 12, 2006 Author Share Posted March 12, 2006 I am thinking about simple mod with switch so I can have original ROM and HyperXF in one 27C64. 1032037[/snapback] Good idea. -Bry Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted March 12, 2006 Share Posted March 12, 2006 I've got my '551 apart at the moment (I'm adding a 34-pin header for the floppy cable), so I'll post pictures as soon as I'm finished. Quote Link to comment Share on other sites More sharing options...
walter_J64bit Posted March 12, 2006 Share Posted March 12, 2006 (edited) I've got my '551 apart at the moment (I'm adding a 34-pin header for the floppy cable), so I'll post pictures as soon as I'm finished. What is the 34-pin header going to do for the XF551? Edited March 12, 2006 by walter_J64bit Quote Link to comment Share on other sites More sharing options...
jaybird3rd Posted March 12, 2006 Share Posted March 12, 2006 What is the 34-pin header going to do for the XF551? I'm replacing the XF551's very short floppy cable with a pin header, so I can plug in a standard floppy cable instead. This will make it a lot easier to mount my 3.5-inch mech, which is currently using a makeshift extension that I cobbled together. Quote Link to comment Share on other sites More sharing options...
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