There are a confusing set of ARM development ROMs. I'm not sure what the
exact difference between different versions is.

Eval099.rom    Executive version 1.00 (6th June 1986)
               Acorn ARM Second Processor
               Supervisor 1.00

ARMJUN86       Executive version 1.00 (6th June 1986)
               Acorn ARM Second Processor
               Supervisor 1.00

Eval100.rom    Executive version 1.00 (6th June 1986)
               Acorn ARM Second Processor
               Supervisor 1.00
               SWIs up to &1B (no OS_Mouse)
               Checks for *Help, *Go, *Close as words
               *MemoryI

Brazil005.zip  Brazil version -.005 (8th August 1986)
               Acorn ARM Second Processor
               Brazil Supervisor 1.00

ARMAUG86       Brazil version -.005 (8th August 1986)
               Acorn ARM Second Processor
               Brazil Supervisor 1.00

Eval101.rom    Executive version 1.00 (14th August 1986)
               ARM Second Processor
               Supervisor 1.00
               Chris's version 19/11/87
               SWIs up to &1C, adds OS_Mouse
               Checks for *Help, *Go, *Close initial letters
               Checks Break type at reset instead of ResetAck
               *Dis
               *Cache, *UnCache
               Copied from live system at 1995 Acorn Show

Spring130.rom  Acorn SpringBoard 1MByte Executive. Version 1.30 25th June 1987.
               Assembly options used: A5002P ADEV IOC MEMC VIDC
               The Acorn RISC SpringBoard - 
               Version 1.30 25th June 1987
               Supervisor

BrazilM4.zip   Brazil a500dev io DUAL memc version -.005 (18th November 1987)
               Acorn RISC Second Processor
               Brazil Supervisor 1.00
               Copied from ABUG A500 Domesday development system

Environment string at &E00
&0E40: abort register store
&0E00: error buffer
Internal commands appear to only be checked from Supervisor prompt