Images above show benchmarks with and without blitter enabled.

The V2.3 16MHz booster is the successor of the V2.2 16MHz booster. While the V2.2 booster had integrated ROM, the V2.3 booster makes use of a external ROM board (sold separately) in order to keep production costs down.

The booster runs the CPU & ROM at 16MHz and supports TOS206 just like the the 2.2 booster.

NOTE: While it may be possible to fit this booster to other ST/F/M & MEGA ST machines, it likely will not physically fit in the case, or may not physically fit the motherboard at all. Also I do not manufacture (or intend to) any other ROM boards to fit any other machines other than the STFM C070789 style motherboard, sorry!

NOTE 2: MEGA ST machines may be possible to use the MEGA ST ROM adapter board if the CE pins are cut and wired to the booster instead. While this may be possible, I am not officially supporting the MEGA ST machines. MEGA ST's will still likely need the MEGA BUFFER BOARD.

There are 3 wires to solder.

1) 16MHz wire (white wire) Connects to the shifter pin 39.
2) ROM select wire (orange wire ) Connects ROM board to booster.
3) 8MHz mode select wire (grey wire) (optional). Connect to 0V to GAL pin 13 to enable 8MHz mode.

CONFIGURING THE ROM BOARD

CE SELECT JUMPER PAD
As shown in the image above, the middle and top pads are soldered which is booster mode. This means the ROM CE signal is now done externally via the white wire which connects to the V2.3 booster. This all

SEL JUMPER
Simple jumper links to select TOS version. There will always be 2 ROM versions with this board. TOS102/TOS104 typically for the normal STFM (same operation as the black boards) or TOS104/TOS206 when used with the V2.3 booster.

The metal shielding angle may touch the front row of pins on the booster board depending on how low down you fitted it. I strongly recommend placing some strong card on the underside of the metal shielding as a extra precaution.