Page 3 of 3


Posted: Tue Jan 02, 2018 12:58 pm
by Petari
Well, I let that overclocking to you and troed. Same as with overclocking FDC chip for HD floppies - some can work fine at 16 MHz, some not. With aged machines it will be just worse. Time too look after that Altera Cyclone ...


Posted: Tue Jan 02, 2018 1:03 pm
by exxos
I brought the later SMT MMU's from atarifreaks a while ago.. latest date chips, so all should have good chance to overclock good. Original PLCC MMU seems to work OK, so later production of MMU should be fine :)

Of course I need to find time to create MMU adapter PCB to use the SMT MMU.. Also need a small PLD to pack the GLUE logic also...

But my current booster design once I get working at 32MHz I will create new MMU PCB and use some spare IO pins on the booster PLD.. So CPU will run at 32Mhz and RAM at 16Mhz. Is the best solution I can do with the current custom ST chips.