[Simh] VAX Tape Emulation?

[Mark Pizzolato]

The simh (and other common formats) use 32bit values to indicate tape record sizes and other info about a record or file mark.  They don’t actually contain offset information.  As such, the limit on size is the limit on space to contain the tape image.

From: Tim Shoppa
Sent: Wednesday, January 24, 2018 3:54 PM


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.

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.

Tim.

On Wed, Jan 24, 2018 at 5:02 PM, Zane Healy <healyzh at avanthar.com<mailto:healyzh at avanthar.com>> wrote:
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?

Thanks,
Zane



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