The tax is said to have been at least 15,000 pesetas per computer. For reference:
* 15,000 pesetas are '''how many?''' approximately 90 euros.(As per [http://www.unitconversion.org/eu-currency/spanish-pesetas-to-euros-conversion.html THIS] converter)* The CPC472 itself was sold for '''how many?''' pesetas ('''how many?''' euros)(For reference, prior to the introduction of this law, a CPC464 system ''including green screen monitor'' was sold for only 25,000 to 30,000 pesetas / 150 to 180 euros (as per [http://www.amstrad.es/forum/viewtopic.php?f=19&p=18955#p19008 THIS] admittedly anecdotal forum post...)
Because there was no space for a new chip, Amstrad designers took off the ROM chips, and put it in a daughter board, along with the extra 4164 RAM chip. Wires connected pins at the ROM from the daughter board to the corresponding pins on the main board. The wires were hard enough to make difficult to turn the daughter board over and reveal the trick: no wires were connected from the DRAM chip to the main board. Even the supply pins were not connected!!