I know nothing of this machine, but the bios and eproms on PC motherboards can cause such errors when the backup batteries are low and they have been powered down for a while (normally 2032 3v coin batteries). If the machine has been disconnected from the power or powered down for any length of time recently I would check the board for such backup batteries and if possible replace, it is possible that on older machines it may be a PCB mounted rechargeable battery in which case not so simple.