Together ZSSU and NIPL made joint venture named Abacus and start working on new computer with name PULDIN ( Puldin is ancient name of Plovdiv where ZSSU is located). He asked the government agency “State Committee for Science and Development” for help and they connect him to NIPL “Programno osiguriavane” – small company within Sofia University. Puldin was produced in 4 modifications 601-A/U/M/T, the RAM memory was 64KB, the ROM was from 4KB up to 68KB depend on the model, the video output could be connected to normal TV, there was LAN card, Printer centronics output, Cassete input, RS232, Floppy disk, etc.īack in 1987 the General Manager of the state owned factory for membrane keyboards ZSSU (“Zavod za Senzori i Senzorni Ustroistwa”) Slavei Papachev start looking for suitable device to manufacture to fill the factory capacity and decided that computer would be something worth to make. Puldin is big sentiment for me at least, because this is 100% pure Bulgarian development, while the “Pravetz” brand was copy of Apple ][ (Pravetz 8A, 8C, 8M), Oric (Pravets 8D) and IBM-PC (Pravetz 16) the Puldin computers were build from scratch both hardware and software and were produced in Plovdiv! The first lecture at our Workshop in January 10th was about Puldin retro computers, so I will take this opportunity and write few words about it.
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