<html><head><meta http-equiv="Content-Type" content="text/html; charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">MOP is a protocol, not a storage spec. The protocol is defined in detail, in the MOP architecture spec, which can be found in various collections of DECnet architecture specs.<div class=""><br class=""></div><div class="">I assume a SYS file is a file meant to be downloaded by a MOP server on some host. What the file contents means depends on what the sender and/or receiver do with that data; the MOP protocol spec has no opinion about it. So the question actually becomes: what do the MOP server on OS x, and/or the MOP client on hardware or OS y, expect to see in the header of the file used for MOP request z?</div><div class=""><br class=""></div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>paul<br class=""><div><br class=""><blockquote type="cite" class=""><div class="">On Feb 20, 2018, at 10:13 PM, Tim Stark <<a href="mailto:fsword007@gmail.com" class="">fsword007@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="WordSection1" style="page: WordSection1; font-family: Helvetica; font-size: 12px; font-style: normal; font-variant-caps: normal; font-weight: normal; letter-spacing: normal; text-align: start; text-indent: 0px; text-transform: none; white-space: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px;"><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Folks,<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Does anyone know any documentation provides some information about MOP header in SYS files?<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Look at first 256 bytes of SYS files:<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000000: A8 00 30 00 44 00 58 00-00 00 00 00 30 32 30 35 |..0.D.X.....0205|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000010: 01 01 00 00 FF FF FF FF-FF FF FF FF 00 00 00 00 |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000020: 20 00 00 01 00 00 00 00-00 00 00 00 00 00 00 00 | ...............|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000030: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000040: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000050: 00 00 00 00 00 00 00 00-03 4D 4F 50 00 00 00 00 |.........MOP....|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000060: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000070: 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00 |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000080: 04 56 31 2E 30 00 00 00-00 00 00 00 00 00 00 00 |.V1.0...........|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">00000090: 00 00 00 00 00 00 00 00-05 30 35 2D 30 35 00 00 |.........05-05..|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">000000A0: 00 00 00 00 00 00 00 00-10 00 87 15 00 00 00 00 |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">000000B0: 80 00 00 00 02 00 00 00-00 00 FF FF FF FF FF FF |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">000000C0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">000000D0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">000000E0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">000000F0: FF FF FF FF FF FF FF FF-FF FF FF FF FF FF FF FF |................|<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class=""><o:p class=""> </o:p></div><div style="margin: 0in 0in 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif;" class="">Thanks,<o:p class=""></o:p></div><div style="margin: 0in 0in 0.0001pt; 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