http://www.ZXSpectrum4.net/op_timing.php
Z80 Board Issue ULA Serial TYPE Notes Submitter
             
Zilog Z80A 1 5C102E 001-081964 UNKNOWN TYPE R=0  loop=0  SP=0 Low RAM: NEC D-416C-3. Upper RAM: daughter board with TMS4532-20NL4. ROM brand: unknown (HN613128P, socketed). Glue logic: not socketed, 74LS type. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
 
             
NEC Z80A 2 5C102E 1 Low RAM: ITT 4116 2N. Upper RAM: OKI M3732L-20RS. ROM brand: NEC. Glue logic: partially socketed, SN74LS type. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
NEC D780C 6A 6C001E-7 121-297660 (blue) 000(yellow) 1   jose leandro
SGS Z80A 6A 6C001E-7 144-035950 1 Richard Butler
Zilog z8400A 3 6C001E-6 8345 Dktronics 1   Richard Butler
Zilog z8400A 3B 6C001E-6 AR201306 1 Richard Butler
NEC D780C-1 2 6C001E-6   1 iss. 3, so must be replacement Woody
ST Z8400AB1 Z80 A CPU 4B 6C001E-7 132-317228 1 Most of the electrical parts are new. micky
Goldstar Z80A 2 6C001E-7 N/A 1 this is a repaired machine, has 4164 chips in 32K upper memory, and a 6C001E-7 ULA which is not the right one for this issue 2 board. It also has the chroma subcarrier crystal change to a 3,58 MHz one to make it compatible to the PAL-N TV system (I'm from Argentina). Hernán Alvarez
SGS Z8400AB1 6A 6C001E-7 N/A 1 original Sinclair board, only modified with a 3,58 MHz chroma subcarrier crystal for PAL-N Hernán Alvarez
SGS Z80A 4A 6C001E-7 012-828720 1 Low RAM: STC 4116 2N. Upper RAM: TMS4532-20NL3. ROM brand: AMI. Glue logic: not socketed, 74HCT type. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
NEC Z80A 3 6C001E-6 001-525863 1 Low RAM: TMS4116-15NL. Upper RAM: OKI M3732H-20RS. ROM brand: NEC. Glue logic: not socketed, SN74LS type. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
Zilog Z80A 3 6C001E-6 127-318406 1 Low RAM: STC 4116 2N. Upper RAM: OKI M41256-10 (256Kbit DRAM's used as 64Kbit DRAM's). ROM brand: ROM brand: unknown (HN613128P, socketed). Glue logic: all socketed, 74LS type. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
Zilog Z80A 4B 6C001E-7 1 Low RAM: STC 4116 2N. Upper RAM: TMS453-20NL3. ROM brand: NEC. Glue logic: partially socketed, SN74LS type. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
SGS Z80A 3 5C112E-2   1 Low RAM: STC 4116 2N. Upper RAM: OKI M3732L-20RS. ROM brand: unknown (HN613128P, socketed). Glue logic: partially socketed, 74LS type. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
Zilog z80a z8400a (8316) 3 6c001e-6 (8328) D01-146631 1 Board has a slight defect, no sound output is generated (may be a bad speaker). Only Test 15 failed and tests will go to the 37. Arda Erdikmen
NEC D780C-1 2 6C001E-6 D03-126767 1 16k RAM (ITT 4116 8pcs), 32k RAM (TI TMS4532-20NL4 8pcs socketed) Tihomir Santek
SGS Z80A 3B 6C001E-6 020-960981 (red) 1 16k RAM (STC 4116 8pcs), 32k RAM (TI TMS4532-15NL3 8pcs), ROM NEC Tihomir Santek
 
             
NEC Z80A 6A 6C001E-7 148-453994 2 Low RAM: STC 4116 2N. Upper RAM: TMS453-20NL4. ROM brand: NEC. Glue logic: PCF1306P. SNAP loaded through DivIDE+ Miguel Angel Rodriguez Jodar
Zilog Z8400APS Z80 CPU 8631 3B 6C001E-7 8444   2 ULA used to belong to an 6A issue Jaime Tejedor
Zilog 4B 6C001E-7 141-392188 2 Richard Butler
Zilog z8400A zz 6C001E-6 001-541127 2   jose leandro
Sharp Z80A 3B 6C001E-6 D01-329512 (green) 2 jose leandro
? 3 or 3B ? D01-421309 2   Arda Erdikmen