MANUAL FOR SNAPIT (6502 ROM image)

This file describes the ROM image SNAPIT which grabs the 32k RAM section of 
an 8 bit BBC series microcomputer.This is then saved straight to disk,which 
may then be studied at a later date, for whatever reason is required. The 
program even saves what information was in the region &E00 to &1900 BEFORE 
paging in the DFS, as the DFS corrupts this area. Games enthusiasts may find 
this of use as most games overlay this area once loaded as the disk system in 
no longer needed anyway.
The image requires at least one 16k bank of sideways RAM free to work.
The manual and software are (C)1997 SPROW

INSTRUCTIONS-
At any command line prompt,eg.the BASIC command prompt '>' type
ON A MASTER: *SRLOAD SNAPIT 8000 <socket#>
             *INSERT <socket#> 
             where <socket#> may be 7,6,5,4
ON A MACHINE WITH SWRAM: *LOAD SNAPIT 8000
and press CTRL-BREAK to initialise.

The image will then be installed into the chosen socket where it will save 
the map to disk in the event of an unrecognised interrupt being passed to 
the paged ROMs.

This is easily achieved by shorting nIRQ to 0v on the 1MHz bus.A simple
push to make switch and ribbon cable will suffice. The ROM can also be
stimulated from the command line with *FX143,5

The resulting file is called 'BBC32K',and these details are available with
the command *HELP SNAPIT

The image will not work if programmed into an EPROM or OTP ROM chip.

KNOWN PROBLEMS/FUTURE ENHANCEMENTS-
No known problems

HISTORY-
V1.00 First release version,to the EUG disk user group.
V1.10 Improved sideways image version by using osgbpb instead of 24256 BPUT
      commands (*very* slow) which inproved speed. Also added a test to see 
      if the image has been put into ROM by mistake.
V1.20 Help text extended along with new ROM service call handling routines.
      Bug fixed where OSGbPb block was not copied to RAM if the file handle
      happened to be 255 (the end marker). OSGbPb block now points to i/o
      processor RAM, incase the Tube is active.
V1.21 Sync star command matcher with other ROMs.
      Removed redundant end of table marker from service call table.