Data General MTB Reference Sought
steve at stephenmerrony.co.uk
Thu Feb 23 01:32:51 CST 2017
Thanks for that confirmation of my hazy memory!
What I can't seem to find is any reference as to how the tape drives interact with the DCH bus and the associated map slots. I thought maybe a later guide might cover that?
From: Bruce Ray [mailto:Bruce at Wild-Hare.com]
Sent: 25 January 2017 18:23
To: General Discussion: On-Topic Posts <cctech at classiccmp.org>
Subject: Re: Data General MTB Reference Sought
G'day Steve -
AOS/VS OS tape drive base names are MTA, MTB, MTC, etc. and do not directly correspond to the assembler mnemonic name(s) - don't be confused by this difference.
The AOS/VS 'MTA'-type tape drive is described on page IV-5. These correspond to the original DG model 4030/6020 units.
The AOS/VS 'MTB'-type tape drive is described on page IV-15. These correspond to the DG model 6026 units.
The AOS/VS 'MTC'-type tape drive is internally the same as the MTB except only a single unit is supported. This was done to distinguish single-unit support for the popular DG model 6125 streamer.
The IV-15 mag tape programming model was consistent between the Nova/Eclipse/MV bus controllers and the Lbus controllers through emulation. One size [almost] fit all.
What difference(s) are you seeing?
On 1/25/2017 1:01 AM, Stephen Merrony wrote:
> Does anyone have (a scan of) a manual that covers programming the
> MV-era MTB tape controller?
> I have a 1980 "Peripherals" manual (014-000632-01) from the
> "Programmer's Reference Series" which covers the MTA type, but it
> seems that the MTB behaves a bit differently and I am missing some
> information for my current project.
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