C question

Hello, all: I have another C issue that I can't seem to see the answer for, so I thought I'd throw it out to the masses. I'm deep into the Altair 680b emulation project (base code done, working on telnet access) and I'm experiencing problems reading a file stream into the memory array. Here's snippets of the code: <SNIP> byte *ppmem ; // pointer into memory array byte ucMem[3*65536] ; // actual memory-see defines below for usage // roms[] is an array of structures defining start-time loaded ROMs. Only one ROM now //(the monitor PROM), but flexible enough to allow bank-switched ROMs (not applicable //in the 680b but a leftover from the 6800 processor emulation code that was borrowed //for the project) // //MEM_xxx are defines for the offset into the ucMem array to various areas #define MEM_RAM 0 #define MEM_ROM 0x10000 #define MEM_FLAGS 0x20000 FILE *pFH ; // open file, etc. //create while loop to walk through roms[] array // Read ROM directly to memory. This works. ppmem = &ucMem[roms[i].iROMStart + MEM_ROM] ; fread(ppmem, sizeof(byte), roms[i].iROMLen, pFH) ; //this doesn't work... //fread(&ucMem[roms[i].iROMStart + MEM_ROM], sizeof(byte), roms[i].iROMLen, pFH) ; //...nor does this //fread((char *)ucMem[roms[i].iROMStart + MEM_ROM], sizeof(byte), roms[i].iROMLen, pFH) ; // Set flags for ROM memset(&ucMem[roms[i].iROMStart + MEM_FLAGS], 1, roms[i].iROMLen) ; </SNIP> So here's where I'm missing it. Under all three fread scenarios, the compiler doesn't throw a warning...they all compile cleanly. But only the first works. This sounds like one of those "What's the Bug" ads from DDJ. What am I missing? Rich