It has one SIMM slot for up to 128MB of RAM (non-ECC, 72pin, 50-100ns), a socket for an optional 68882 FPU (PGA, up to 60Mhz) with a socket for an optional FPU oscillator (otherwise uses CPU clock speed, via jumper setting), and a battery backed up realtime clock.
The software supplied with the M1230XA contains an excellent setup utility that allows some tweaking, and an equally excellent RAM test tool with proper documentation.
Due to it's FastRAM access speed, it's probably the fastest 68030 accelerator for the Amiga 1200:
~7400 dhrystones @ 50Mhz / 60ns RAM / 4 cycles (recomm.)
~8300 dhrystones @ 50Mhz / 60ns RAM / 3 cycles (experim.)
These accelerator boards are very well-made, but seem to be very rare nowadays, making it difficult to find information and support in case of problems. Below is a list of sources that should help answering your questions about the M1230XA and keeping it running.
Amiga Hardware Database info page
Info, manual and installation disk download
Install disk: http://amiga.resource.cx/install/M1230XA-101.dms
"Microbotics MBX1230XA / M1230XA Amiga 1200 accelerator board"
Someone (successfully) tried to repair his M1230XA
An interesting article about speeding up your M1230XA by slowing it down
"Microbotics 1230XA -- 68030 Accelerator for the Amiga 1200"
Amiga Report magazine review by Tom Mulcahy (Amiga Report issue 1.15 of 1993-07-02)
"Usenet Review: Microbotics 1230XA Accelerator for Amiga 1200"Another detailed review of the board, by Brian King (Amiga Report issue 1.23 of 1993-09-03)
"Matériel : M1230 XA"
A review in "Obligement" magazine, by Nelson Barata (of 1995-02)
Hints and bits: Random occurrences of the M1230XA on the net
A post from Mr. Jerry M. Robinson from 1997-03-24, claiming to be the designer and coder of the the M(BX)1230XA:
Timothy De Groote (Hyperion Entertainment) seems to have, or have had, an M1230XA ("Microbotix 1230")