Miscellancelous documents for PRK-84 microcomputer PRK-84 is Z80 based CP/M 2 compatible microcomputer designed and distributed by Polyteknikkojen radiokerho (OH2TI) in the 1980's. CRT-51 is 8051 based serial terminal. This terminal was commonly used with PRK-84. For more information contact: prk[at]list[dot]ayy[dot]fi paavo[dot]leinonen[a]iki[dot]fi