also designed to be compatible with the previous HT machines, with the option of switching between TRS-80 and ZX Spectrum mode. It had a graphics resolution of 256×192 (the ZX Spectrum standard) and an AY-chip for sound (for compatibility with previous HT machines). It featured a 32 KB ROM, 64 KB RAM, and (uniquely) a Commodore serial port which enabled the connection of peripherals for the C64 (e.g. the 1541 floppy disk drive). Polish Elwro 800 Junior The Elwro 800 Junior was Polish clone of the ZX Spectrum produced by ELWRO for use in schools. It ran a special version of CP/M called CP/J. The computer had a full size keyboard, and even a paper/document holder. The reason for the latter is that the machine shares the same case as the Elwirka electronic keyboard, which had provisions for holding sheet music. Peripherals were attached to the computer using a mix of DIN and D-subminiature connectors. ELWRO had developed a local area network protocol called JUNET (JUnior NETwork) for use with the machines which operated on a basis not unlike MIDI, in which one DIN cable was used to receive data, and another to send it. In this manner, the teacher was able to monitor what all the students in the class were doing on their computers. The updated Elwro 804 Junior PC had an internal 3.5″ disk drive. Romanian CoBra The CoBra (COmputer BRAsov) was a ZX Spectrum clone built in Braşov, Romania. CIP and CIP-03 CIP and CIP-03 are Romanian ZX Spectrum clones made by Intreprinderea Electronica. CIP stands for Calculator pentru Instruire Personala ("Computer for Personal Education"). The ROM is original Sinclair, but has been modified to display 'BASIC S' in place of the standard Sinclair copyright message. Only one set of 8×1-bit 64 KB RAM modules is present. The initial version of the CIP had a low quality 2 KB EEPROM with a propensity for fast data loss. The later version of the EEPROM was designed to work with the 3 data densities on the tape at speeds up to 3 times higher than the original, and the 2K ROM was also capable of loading and saving at those speeds, using the whole 64K as storage. The top data density was often hit and miss – very good magnetic tape had to be used, and a special monophonic cassette recorder could be bought separately for best results.