Date   : Thu, 31 Jul 2008 20:35:40 +0100
From   : info@... (Sprow)
Subject: ROM type byte for PDP-11

In article <48920765.6040400@...>,
   Jules Richardson <jules.richardson99@...> wrote:
> Jonathan Graham Harston wrote:
> > I have a requirement to specify PDP-11 code in the ROM type
> > byte at rombase+6.

> We're talking about offset 6 (i.e. the 7th 
> byte) from the start of code in the [Acorn] copro's ROM, right?  Or is 
> 'rombase' at some obscure location depending on the type of copro?
> (just wondering, as that offset is 0x9F for my ARM Eval kit, not 0x0D...)

We're talking about software stored in sideways ROM format in the host but
that is not intended to be executed by the 6502 host, variants on the usual

   JMP languageentry
   JMP serviceentry
   EQUB typebyte     <---------- THIS BYTE
   EQUB copyrightoffsetpointer
   EQUB binaryversionnumber
   EQUS "Title String"

and so on