Well, as of yesterday afternoon the Minitower is now a complete unit booting flawlessly into a fresh install of 8.6 with a 7.5Gb U-series I found in a slotload drive rack in the cupboard, and currently using my test CD-ROM drive until i out a new or otherwise working unit in it's place. 
Still havent worked out what the quarrel it had with OS9 is... the 7.5Gb drive had a dual install of 9 and some flavour of X and it also refused to boot. Whatever... it works now
Note the computer in the background of the networking setup assistant...
Having gotten this thing now together and working, I decided to go to the Stack this evening after rehearsals and bring home the 233DTso I would have something to play with on my night off work. I got straight into it as soon as I got home with this being what I had to work with...
The case is grubby and the logic board has a nice slick of dried acid and plastic from a leaked Saft battery (best I can tell, the OEM one by the date code). Having looked at the replacement board, I notice where this battery has leaked the only surface mounted components that seem to exist in ground zero are a small resistor and what I beleive to be a tiny board power LED... As the damage seems localised to a fairly unpopulated area, I will clean the board up and perhaps attempt a repair at some stage as it is a Rev. 2 board (for some reason). I'm unsure how far the acid has gone through the board, however it's worth an attempt for the sake of a couple of caps and resistors and a diode... Even if some traces have been damaged, a wire repair may be feasible. That's a job for another time however.
The replacement board, whilst correct for the machine, is a step back in being an early revision unit from the 266MT which has the Rage II+ chip and no slave support. Ah well... at least it *should* work. I have taken out the SGRAM DIMM and put it to better use in the 300 minitower, and until I ascertain whether 233MHz and 266Mhz voltage regulators are able to be interchanged, I have also used the original 233 CPU, jumper block and reg board from the DT as the parts tower was missing this part.
Anyway, I am now about to power it up, hope the PSU doesnt explode, and from there, ascertain whether it will power on and if the drives are still good... wish me luck?
Still havent worked out what the quarrel it had with OS9 is... the 7.5Gb drive had a dual install of 9 and some flavour of X and it also refused to boot. Whatever... it works now 
Note the computer in the background of the networking setup assistant...
Having gotten this thing now together and working, I decided to go to the Stack this evening after rehearsals and bring home the 233DTso I would have something to play with on my night off work. I got straight into it as soon as I got home with this being what I had to work with...
The case is grubby and the logic board has a nice slick of dried acid and plastic from a leaked Saft battery (best I can tell, the OEM one by the date code). Having looked at the replacement board, I notice where this battery has leaked the only surface mounted components that seem to exist in ground zero are a small resistor and what I beleive to be a tiny board power LED... As the damage seems localised to a fairly unpopulated area, I will clean the board up and perhaps attempt a repair at some stage as it is a Rev. 2 board (for some reason). I'm unsure how far the acid has gone through the board, however it's worth an attempt for the sake of a couple of caps and resistors and a diode... Even if some traces have been damaged, a wire repair may be feasible. That's a job for another time however.
The replacement board, whilst correct for the machine, is a step back in being an early revision unit from the 266MT which has the Rage II+ chip and no slave support. Ah well... at least it *should* work. I have taken out the SGRAM DIMM and put it to better use in the 300 minitower, and until I ascertain whether 233MHz and 266Mhz voltage regulators are able to be interchanged, I have also used the original 233 CPU, jumper block and reg board from the DT as the parts tower was missing this part.
Anyway, I am now about to power it up, hope the PSU doesnt explode, and from there, ascertain whether it will power on and if the drives are still good... wish me luck?