Yes, The 555 just indicates that it came from the factory with two drives instead of one. Bill Sudbrink

The Sanyo MBC-55x-x series are all the same for the most part. The 550 is a single sided, single drive unit, the 550-2 has a single double sided drive. The 555 was 2 single sided drives and the 555-2 was dual double sided drives. These numbers applied only to the item as shipped added or changed drives. NRI included these machines with their master course in microcomputers & microprocessors, right after the Tandy TRS-80 model 4D wa phased out. They were great people to offer students a cost reduced second drive, even though the box it came in from the factory showed the unit as a dual drive to begin with. I believe all they did was order a ton of second drive bay fillers and take out the second to resell to the dumb students at $100 more. Imagine a $100 tag onn a Teac FD-55B! What a rip when I dump dozens in scrap or donate many of them. Whe I do sell them I get roughly $2 to $5 each dependant upon condition. Answer, yes the silver keyboard with black keys and no ALT will fit any of the MBC-55x-x units, also known as the "Silver Box" (not by me though). The serial port add-on was an 8251 UART, not the standard 8250 for IBM/compats so patches are needed for communications programs. There is still a BBS with *some* of the patches and anyp MBC-55x programs, called the First Sanyo Opus. The number is (412) 856-1428. Should still be up, called it just last month and it was. You have to look for the Sanyo specific files area. musicman38(a)mindspring.com wrote: