ZXSTSPECTRANET

Dylan Smith's Spectranet Ethernet interface for the 16K, 48K, 128, +2, +2A and +3 ZX Spectrums.

// Spectranet state
#define ZXSTSNETF_PAGED                      0x0001
#define ZXSTSNETF_PAGED_VIA_IO               0x0002
#define ZXSTSNETF_PROGRAMMABLE_TRAP_ACTIVE   0x0004
#define ZXSTSNETF_PROGRAMMABLE_TRAP_MSB      0x0008
#define ZXSTSNETF_ALL_DISABLED               0x0010
#define ZXSTSNETF_RST8_DISABLED              0x0020
#define ZXSTSNETF_DENY_DOWNSTREAM_A15        0x0040

#define ZXSTSNETF_FLASH_COMPRESSED           0x0080
#define ZXSTSNETF_RAM_COMPRESSED             0x0100

typedef struct _tagZXSTSPECTRANET
{
  ZXSTBLOCK blk;
  DWORD dwFlags;
  BYTE chPageA;
  BYTE chPageB;
  WORD wTrap;
  BYTE chRegisters[0x30];
  DWORD dwcbFlashLength;
  BYTE lpchFlash[1];
  DWORD dwcbRamLength;
  BYTE lpchRam[1];
} ZXSTSPECTRANET, *LPZXSTSPECTRANET;

Members

blk

The block header. The block id is ZXSTBID_SPECTRANET ('S', 'N', 'E', 'T').

wFlags

Various flags. This can be any combination of:

Flag	Meaning
ZXSTSNETF_PAGED	The Spectranet is currently paged.
ZXSTSNETF_PAGED_VIA_IO	The Spectranet was paged in via I/O port.
ZX STSNETF_PROGRAMMABLE_TRAP_ACTIVE	The Spectranet's programmable trap is currently active.
ZXSTSNETF_PROGRAMMABLE_TRAP_MSB	The next write to the Spectranet's programmable trap port will set the MSB of the programmable trap address.
ZXSTSNETF_ALL_DISABLED	All the Spectranet's traps are currently disabled.
ZXSTSNETF_RST8_DISABLED	The Spectranet's RST 8 trap is currently disabled.
ZXSTSNETF_DENY_DOWNSTREAM_A15	The Spectranet is forcing the A15 line low for any peripherals connecting via its expansion port.
ZXSTSNETF_FLASH_COMPRESSED	If set, the flash data at lpchFlash is compressed using the Zlib compression library.
ZXSTSNETF_RAM_COMPRESSED	If set, the RAM data at lpchRAM is compressed using the Zlib compression library.

chPageA

The page currently paged into the Spectranet's page A (0x1000-0x1fff).

chPageB

The page currently paged into the Spectranet's page B (0x2000-0x2fff).

wTrap

The current value of the Spectranet's programmable trap.

chRegisters

The values of the core W5100 registers.

dwcbFlashLength

The length of the possibly compressed Spectranet flash.

lpchFlash

contents of the Spectranet's flash. When uncompressed, this must be exactly 0x20000 bytes in length.

dwcbRamLength

length of the possibly compressed Spectranet RAM.

lpchRAM

The contents of the Spectranet's RAM. When uncompressed this must be exactly 0x20000 bytes in length.

Remarks

The contents of the W5100's socket registers are not saved - whatever was listening on the other end will have gone away when the snapshot is restored.

Revision history

Available since version 1.5