Successful 1.5 booster install in STM c070243 rev H

Help & information about the V1.5 booster.
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Successful 1.5 booster install in STM c070243 rev H

Post by Steve » Wed Dec 05, 2018 1:09 pm

I just finished installing the 1.5 booster in my STM. There weren't any instructions for installing it in my machine as it has no CE section on the motherboard like STFM's have. So exxos kindly gave me the following information:

"You need 3 diodes 1N4148...
Solder the "white line end" of the diode to CE (pin 20) of the 3 HI ROM's. (one diode per HI ROM)
Then the other 3 ends of the diodes, solder them all together, then that is your CE line for the booster."

There was also a 5v pullup resistor which I soldered to a diode leg near the CPU to provide 5v. I don't know the resistor value maybe Chris remembers.
IMG_20181205_113341.jpg (2.54 MiB) Viewed 339 times
^ Here I wanted to install the diodes as neatly and cleanly as possible, so I opted for the rear of the motherboard rather than solder directly to the TOS pins, just in case I might swap my TOS roms one day (with all the talk of Peter Putniks improved roms etc)
IMG_20181205_114909.jpg (2.43 MiB) Viewed 339 times
^ Here I managed to solder them together neatly and ran the cable through a handy hole in the PCB to the top side.
IMG_20181205_115406.jpg (2.69 MiB) Viewed 339 times
^ I neatly routed the cable through the TOS roms, through a diode leg and then up underneath the CPU through it's legs and onto the CE port.
IMG_20181205_123907.jpg (1.86 MiB) Viewed 339 times
^ Here I connected the booster from the CE port to 5v off a diode leg with the resistor
IMG_20181205_123914.jpg (2.32 MiB) Viewed 339 times
^ Just a shot of the overall machine
IMG_20181205_123033.jpg (2.57 MiB) Viewed 339 times
^ Gembench results vs a stock STM.

Overall I am really happy with the results, I also managed to re-cap the machine since I had it apart. I have a bad habit of doing too many things at once, so if I have issues I don't know what caused them :) But luckily everything was good. This must be the ultimate STM now, running at 16mhz and 4mb of ST RAM :)

Thanks for all the help Chris :)

Kind regards,

Falcon ct60e 060 - 256mb ram - phantom bus and dsp accel // Atari TT - Thunder and Storm IDE 64mb ram - Lightning VME - USB LAN - Ati Mach64 2mb // Atari STM 4160 - 4MB ram - 16Mhz exxos 1.5 booster - Ultrasatan

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Re: Successful 1.5 booster install in STM c070243 rev H

Post by exxos » Wed Dec 05, 2018 1:42 pm

:bravo: :coolpics:

Thanks for posting this, will be helpful for others I'm sure! :thumbup:
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Re: Successful 1.5 booster install in STM c070243 rev H

Post by PaulJ » Wed Dec 05, 2018 2:34 pm

Nice job!

:bravo: :bravo:

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Re: Successful 1.5 booster install in STM c070243 rev H

Post by IngoQ » Thu Dec 06, 2018 12:07 pm

Looks very neat, congrats :) And I just love the union jack on it ;)
Ingo :geek:

“Perfection is achieved, not when there is nothing more to add, but when there is nothing left to take away.” - Antoine de Saint-Exupéry

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