The Solartron 7150 Plus has two processors and two ROMs.

The lower board has its ROM stored in a Fujitsu MBM27128 (regular 27128) in IC508.

The upper (floating) board is typically fitted with a Hitachi HD637B01V0P one time
programmable micro controller (IC103).  This can be replaced with UV erasable
HD637B01V0C if you can find one.  My ROM programmer doesn't know either of these,
and therefore I wasn't able to read them.

The other day I opened up a late 7150 Plus to find that the processor fitted on the
floating board was an HD68P01M with a "piggy-back" Intel 2764A.  An identical label
was fitted to this as to the OTP type parts.

The images were taken using a Data I/O Chiplab, which uses 8 byte checksums, for 4
byte checksums, just use the rightmost four characters of the checksums shown below.

Position    Type    Label         File       Checksum
IC103       2764A   7150 5251 AC  IC103.BIN  001B 59FA
IC508       27128   7150 5252 AC  IC508.BIN  0029 8975

You'd need to study the datasheets to be sure that the ROM image for IC103 is useable
without remapping for anything except the HD68P01M with 2764.

David Partridge (mailto:david.partridge@perdrix.co.uk)
