I have a GQ-4X. Everything seems to work well, except opening a BIN file with Read Mode: x Byte of 4 (32-bit split).
I'm using 27c040's (so the buffer size should be 7FFFFh). This works for a standard 8-bit file (Read Mode: Normal), but the buffer size is limited to 1FFFFh when trying to load with the 32-bit split.
The problem is that the EPROM size does not change. The buffer size MUST match the EPROM size. The current software bug trancates the data in the buffer to be 1/4 the size of the EPROM.
Do you mean you only need to write x Byte of 4 daya in EPROM, and keep those data in the original position? then you may need to use a third party software to modify the data file.