From: "'LORENZO JOSE AYUDA SERRANO'" <lorenzo@mcps.unizar.es>
Date: Wed, 28 Dec 94 14:36:45 +0100

Hello Guenter Woigk.

I'm Lorenzo (ZX Spectrum Programer).
I have read your public leter. I'm happy for your new emulator
and I would like to help you, if it is posible. Here follows the description
of *.SP file format.  I have translated it from spanish to english.
This description belongs to Pedro Gimeno's PC Spectrum emulator's docs.

Files *.SP:

Offset	Size		Description
------- ----------- -----------------------------------
 0		2 bytes		"SP" (53h, 50h) Signature.
 2		1 word		Program long in bytes (49152 bytes)
 4		1 word		Program location (16384)
 6		1 word		BC
 8		1 word		DE
10		1 word		HL
12		1 word      AF
14		1 word		IX
16		1 word		IY
18		1 word		BC'
20		1 word		DE'
22		1 word		HL'
24		1 word		AF'
26		1 byte		R
27		1 byte		I
28		1 word		SP
30		1 word		PC
32		1 word		Reserved for future use (0)
34		1 byte		Borde color
34		1 byte		Reserved for future use (0)
36		1 word		Status word

status word:

bit		Description
------- -------------------------------------------------
15-8	Reserved for future use
 7-6	Reserved for internal use (0)
   5	Flasp:     0 - ink INK, 1 - paper PAPER
   4	Interruption pending of ejecution
   3	For future use
   2	IFF2    (internal use)
   1	interruption mode: 0=IM1; 1=IM2
   0	IFF1    0 - DI ; 1 - EI