SFD-1001 and 8250LP Parts Location Part Number Description 1001 8250LP 7G,9G UB6,UB8 2116/58725 (2) 2K x 8 static RAM DOS: 1J UA13 901887-01 2364 ROM DOS 2.7 C000-DFFF 3J 901887-02 2364 ROM DOS 2.7 E000-FFFF 3J UA11 901888-01 2364 ROM DOS 2.7 E000-FFFF UA13 251165-01 2564 EPROM DOS 2.7 C000-DFFF UA11 251166-01 2564 EPROM DOS 2.7 E000-FFFF 2H UAB15 6502 CPU 4J,6J UAB17,UAB18 6532 (2) RIOT Controller: UC1 251167-01 2516 EPROM GCR UC1 251168-01 2716 EPROM GCR 5C UC1 901467-01 6316-017 ROM GCR 1E UAB4 6502 CPU 5E UAB1 6522 VIA UAB3 6530 RIOT DOS 2.7 3E 251232-01 6530 adapter (1001) UAB3 251232-02 6530 adapter (8250LP) drive Matsushita/Panasonic JU-570-2 6530 adapter: U1 U1 6530 RIOT (ROM bypassed) U2 251256-02 *2516 EPROM DOS 2.7 Matsushita (8250LP) U2 251257-02A *2716 EPROM DOS 2.7 Matsushita (1001) U2 251474-01B *2716 EPROM DOS 2.7 Matsushita (8250LP) * Only the first 1 K is accessible.