Atari PC5 with Paradise RAMBIOS.SYS
Speed 6 MHz

ATPERF -- PC Tech Journal AT Hardware Performance Test
Version 2.00, Copyright (c) 1986, 1987, Ziff Communications Co.
Written by Ted Forgeron and Paul Pierce
IBM PC/AT model 339 (8 MHz) = 1.00 for relative measurements.
                                Byte         Word         Dword    Relative
Average instruction fetch:      0.50 uS      0.34 uS      0.54 uS      1.17
Average RAM read time:          0.68 uS      0.68 uS      0.69 uS      0.59
Average RAM write time:         0.39 uS      0.39 uS      0.39 uS      1.02
Average EMM read time:          0.68 uS      0.68 uS      0.69 uS      0.59
Average EMM write time:         0.39 uS      0.39 uS      0.39 uS      1.02
Average ROM read time:          0.69 uS      0.68 uS      0.69 uS      0.59
Average Video write time:       1.25 uS      1.25 uS      2.49 uS      1.93
80386 CPU clock rate:         6.0 MHz  Relative: 0.75
Refresh overhead:            3.3%

Memory          Access width          Wait states
RAM read            Dword                    2
RAM write           Dword                    0
EMM read            Dword                    2
EMM write           Dword                    0
ROM read            Dword                    2
Video write         Word                     5
