DMP2000 Buffer Upgrade Kit
The Amstrad DMP2000 Printer 8K Buffer Kit from Goldmark Systems is a RAM upgrade for Amstrad's DMP2000 and DMP3000 printers.
The "kit" seems to be simply consisting of a 8K SRAM chip, to be used as replacement for the printers built-in 2K SRAM, increasing the buffer size by 6K.