I am not sure what you're asking. All original M4's had a white case (You could upgrad an M3 to an M4 by replacing the keyboard and CPU board, in that case (!) you ended up with a grey machine). All M4 disk controllers (AFAIK) support 4 drives. To have 3 internal drives is unusual, but possible. The 'stock' configuration was up to 2 full-height drives internally-mounted, and 2 externals. An amber monitor is uncommon, but not that uncommon. Original M4s had a green CRT, M3s that were covnerted kept the white CRT. But there was at least one company advertising in Byte and/or 80micro that sold an amber CRT that would drop right in. I asusme that's 128K RAM. Radio Shack supplied 128K machines and upgrade kits, but there were 3rd party ones too (The official price was high, to say the least -- the kit consisted of 8 64K bit RAMs and a PAL chip IIRC). Maybe some 3rd party kits came iwth an ID button that mentioned the vendor's name Are you sure? I thought M4s only checked drive 0 for a boot disk (but once booted, they will look for a given file on each drive in turn unless you specifiy a drive). -tony