Centurbo 1 evolution 3b -> CT60 booster

[Rustynutt]

What oscillator does your CT63 have for the bus accelerator option?
Mine is 40MHz.

Kind of looked at it after failing to get a CT60, CT63, CT60e to boot with anything above a 23MHz bus and thought why battle (over 23MHz BUS) something Rodolphe has already look at. Assume he went with 40MHz for a "trouble free" installation.

All 3 of the versions here usually hang during SDRAM test at boot above 23MHz.

But I can't "switch" clocks as with Nemesis/Phantom/CT Boost after boot. Yet.

BUS GALs. Remember talking with Rodolphe way way back. Seems at one point he wanted to have them moved from the Falcon board to the CT. Been so many years, my memory is pretty fragmented

For the DFB project, Badwolf modified some timings in his approach of the GALs.

I've programmed faster GALs for the "experiment" Falcon. It had no bearing on increasing bus speed.

Interesting note. The AB040 hangs the same way as the CT does above 23MHz.
Both fail during fast RAM installation.
Expansion BUS?

[Rustynutt]

Thanks to Mikro for archiving all this stuff.

https://mikrosk.github.io/doitarchive/d ... 0b0701.htm

Something Rodolphe wrote early on I've never seen. Then my first CT was from his first batch, and I packed it away for about 7 years before finally looking into it

As stated above, my CT63 has a 40MHz oscillator, which he describes, but later the ABE timing has been fixed so a 50MHz oscillator can be utilized.

About all I knew of SDMA issues with high color modes was "stressing" the bus.

The part about the VIDEL switch from 32 to 16 bit access chewing into SDMA latching time was great.

Realize a lot of solder has flowed under the bridge since most of this, but something more to chew on here.

To switch the CT63 bus clock off and on, is there a soft switch? I've not seen one.
I have a CT63 "essential" tools floppy.