Not sure what your saying Simbo.
The memory is working perfectly. It might be nice to combine it all into a single 4mb 72pim simm- and I have a few- but it is unneccessary.
Both banks are running fine now- just some old soldering on the 20yr old shiftr mounted ram was a little troublsome. All fixed.
The simms were added becuase I have over a dozen of them- and the wiring is relatively simple. 4Mb is nice @ 80ns.
The Hd modual is perfect again. The latest replcement FDD was slightly incompatible. Circuits traced and modified. Just need to load the HD driver under any TOS version to activate High Density in the format menu. But the supplied formatter seems better anyway. IBM compatible. I've even removed the 'bypass' circuit. Neater too.
The overscan harness is a little messy-long connection points. But its nearly perfect to fit a Lascan device- only one wire to alter- and two to remove even. Bonus is the old overscan wasn't >tos1.4 compatible. Plus removing is harness is difficult due to cut tracks. Lascan is simple to make.
I've been talking about TOS patching since I do want/need to fit a new hdd. My MegaFile is very worn out from years of use- and RLL harddrives are impossible to get. Fitting an IDE drive is conceptually simple- The TOS patching was straight forward, new 1.4 ROMs have been created and tested perfectly so far. I've also patched some 'Super' 2.06 images too for inclusion with the final mod. And have been testing the results with Seltos/Steem.
Rather than fit the space hungry CPU mounted TOS kit- I'll knock out a board with a new GAL and IDE logic. My GALs are on their way.
Finally the C16 is functioning well- I can't wait for some hdd space to reinstall Windows 3.0/3.1 and see VGA mode for once. I've always had a colour monitor/CGA. Be interesting to see if pperos IDE driver is compatible in PC emulation mode. Only failing memory wiring was causing it to act up.
Remember all these upgrades have been in service for many years. Only the simms are newish. The cpu mounted TOS2.06 could have been buggy for any numbr of reasons- but using it lately with SelTOS has been perfect. I expect the same from alternatively fitted roms- and will trial soon. Plus the questionable IMP DMA chip has been replaced with a real Atari one from my spares.
So expect a homebrew IDE conversion soon- with thanks to pperos excellent documentation, I just have to work out a board- since no Eagle PCB file links seem to work anymore- plus they won't fit my setup as the cpu socket is taken. I plan to piggyback the blitter. Just need to find narrow spaced idc header pins that will fit the socket rows- and get some new etching chemicals.
I'll post up a picture soon of the cleanedup motherboard. Big difference. Tidier resoldered wiring, removed old double sided tape. New rom window stickers.