Sinclair ZX Spectrum DivIDE Plus GAL Upgrade Set

This is a s set of 3 improved GAL upgrade chips for the DivIDE Plus Compact Flash / IDE Interface for the ZX Spectrum.

The GAL chips not only resolve some issues with the original DivIDE Plus, but will also allow you to install esxDOS, the new firmware for the DivIDE, which provides a whole host of useful commands - see http://esxdos.org/

EsxDOS is currently limited to 8.3 file name format, but has the following features:

• Supports HDD/CDROM/ZIP/LS120 devices
• Device and filesystem abstraction layer
• Full FAT16/FAT32 read/write support (no 64K clusters, no extended partitions, no LFN).
• Provides extended BASIC commands
• BASIC files integration using +3DOS headers for FAT filesystems
• Support for seamless IM2 loading/saving, from BASIC and machine code
• System commands loaded from /BIN dir of system drive
• TAPE emulator supports reading/writing from/to TAP files. TAP attaching functions are available to external programs.
• POSIX-based API usable by .commands, external programs and NMI.SYS. Functions available on rst $08:
open, read, write, close, opendir, readdir, seek, sync, fstat, getcwd, chdir, unlink...
• Possibility of getting absolute LBA sector and device on an opened file (for direct I/O)
• Kernel loads modules (.KO files) on demand
• NMI.SYS support (NMI system is independent, ESXDOS kernel just provides services)

To install the new GALs, you will need to open the DivIDE Plus case and remove three chips (which are in sockets luckily) - the three GALs are identified on the drawing in the image gallery.

The three GALs are marked R, M and A,

With the DivIDE Plus edge connector towards you:

• the A GAL is positioned to the right (parallel to the edge connector), with the notch nearest the edge of the board.
• the M GAL is positioned on the left hand side of the board (parallel with the side of the interface), with the notch pointing towards the SD Card connector.
• the R GAL is positioned to the right of the M GAL, also with the notch pointing towards the SD Card Connector

NOTE: Take care to ensure you plug the correct GALs into the sockets, and use the correct orientation of the notch.

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