Started by Nitro, April 08, 2023, 05:28:17 AM
Quote from: gborgnsDoubler based on Quaddoubler with the exact circuitry listed in the Motorola spec. sheet on the MC88916. I used a SIP prototype PCB with a copper tape ground plane added on the bottom. Works as advertised. Note that the IC is upside down in the picture.
Quote from: gborgnsSchematic for the homemade clock doubler. All capacitors are ceramic and resistors thick film.
Quote from: gtnicol on April 08, 2023, 07:36:59 AMWhat is the result of using that clock doubler? Is that something you could use on a turbo cube board, or could you do something similar on a regular 25Mhz board?
Quote from: zombie on April 09, 2023, 06:08:01 PMWhat I wonder is has there ever been an attempt to double the turbo machines, ie a 66mhz doubling of the 33mhz machines?
Quote from: zombie on April 09, 2023, 06:08:01 PMI believe there was an upgrade, was it called the pyro? that doubled 25mhz machines to 50mhz, and if I recall worked well. It would run faster than turbo machines overall on most things.There also was some next official upgrade, I think the nitro, that brought machines up to 40mhz, and I think it outpaced the pyro in most but not all ways.What I wonder is has there ever been an attempt to double the turbo machines, ie a 66mhz doubling of the 33mhz machines?
Quote from: zombie on April 10, 2023, 01:31:45 PMOh, and as for the 68060 chip, from what I've heard there is some incompatibility. I guess some commands or something that the NeXT relies on in the 68040 that does not get invoked correctly by the 68060.