<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Just to be clear, I’m looking to backup a physical machine, to a virtual tape drive, such that I can restore the data to either SIMH or a Physical machine. I don’t need to extract files. I can extract files (and I have with some of the most critical) via NFS to my Mac. <div class=""><br class=""></div><div class="">Except for legacy hardware, most tapes I dealt with in the 90’s were in the 20-40GB range. Current tapes now are multi-Terabyte, but not something most of us can afford to have at home, which is why I’m looking to go this route.<div class=""><br class=""></div><div class="">Zane</div><div class=""><br class=""></div><div class=""><br class=""><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On Jan 25, 2018, at 5:39 AM, Tim Shoppa <<a href="mailto:tshoppa@gmail.com" class="">tshoppa@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class="">A couple of the tape image utilities I wrote or updated in the 1990s have that limit. Let me see if they are still in the SIMH utility tree. They never would’ve bitten me back in the 90s because the biggest reels I ever dealt with were 3600 feet at 6250 BPI, less than 250 Mbytes.<div class=""><br class=""></div><div class="">Tim<br class=""><div class=""><br class="">On Jan 25, 2018, at 8:23 AM, Johnny Billquist <<a href="mailto:bqt@softjar.se" class="">bqt@softjar.se</a>> wrote:<br class=""><br class=""></div><blockquote type="cite" class=""><div class="">Hmm. None of the tools I wrote ever had that limit. They just process records and don't give a damn about absolute disk or tape position.<br class="">
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Johnny <br class="">
<br class=""><br class=""><div class="gmail_quote">Tim Shoppa <<a href="mailto:tshoppa@gmail.com" class="">tshoppa@gmail.com</a>> skrev: (25 januari 2018 00:53:34 CET)<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
<div dir="ltr" class="">Many common tape image tools as of two decades use 32-bit integers to carry offsets around and will be limited to 4Gigabyte tape image sizes.<div class=""><br class=""></div><div class="">I don't think this is a fundamental limit to the tape image formats used by SIMH, just a common limitation of the tape image tools you might find from 20 years ago.</div><div class=""><br class=""></div><div class="">Tim.</div></div><div class="gmail_extra"><br class=""><div class="gmail_quote">On Wed, Jan 24, 2018 at 5:02 PM, Zane Healy <span dir="ltr" class=""><<a href="mailto:healyzh@avanthar.com" target="_blank" class="">healyzh@avanthar.com</a>></span> wrote:<br class=""><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">What type/size of tapes does the VAX emulation support? I was looking through the doc’s and it wasn’t obvious to me. Is there a size limit?<br class="">
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Thanks,<br class="">
Zane<br class="">
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