Bugs, wishlist, etc in ARMCoProMOS v0.33
========================================

LOAD after reset, not working with NET - FIXED
SYS OS_Mouse, should call ADVAL() - FIXED
SYS OS_ReadLine should issue OsByte &D9 - FIXED
*MDUMP - FIXED, was bug in *MDUMP

System vectors - Implementing via ARMSupport code
-------------------------------------------------
No system vectors. OS_CLI jumps directly to the MOS CLI code
instead of vectoring via CLIV, etc.

Startup banner
--------------
On startup, says eg '16MB'. Acorn convention is to use a single
letter for memory sizes, eg 32K, 1024K, 16M.

*MEMORY
-------
*MEMORY B--- dumps from 0 instead of B---, eg *MEMORY B00
dumps from 000.

*GO
---
*GO enters code with R14 on the stack, so code can't return
with MOV PC,R14. Should be something like:

STR     R14,[R13,#-4]!     ; Save R14
MOV     R0,#2              
ADR     R3,L3D9C           ; Point to 'GO'
SWI     XOS_FSControl      ; Inform FSControl
LDRVS   PC,[R13],#4        ; If error, pop link to PC and return
MOV     R14,R13
MOV     R13,#&0B00         ; Point to system stack
STMFD   R13!,R14           ; Stack old stack pointer
TST     PC,R0              ; Clear flags
BIC     R0,R0,#&1F         
ORR     R0,R0,#&10
TEQP    R1,R0              
ADR     R14,cmdGO_return
MOV     PC,R2              ; Jump to enter code
.cmdGO_return
LDMFD   R13!,{R13}         ; Get old stack back
LDMFD   R13!,{PC}          ; Pop old link to PC and return


*QUIT
-----
Later versions of RISC OS (and BBFW) allow *QUIT n to return
a return value, passing n to OS_Exit.


Entering machine code
---------------------
Machine code programs can't find it's command line. SYS OS_GetEnv
always returns R0=>"GO".


Supervisor
----------
Calls ReadLine32 with b31 set, so control codes can't be typed,
so for instance, can't press Ctrl-L to clear screen.