LK1,LK2,LK3
LK1,LK2,LK3 connect to PPI Port B, Bit1-3. The links select the manufacturer name (which is displayed by the BIOS in the power-up message). These LKs exist on all CPC mainboards (in CPC Plus/GX4000 schematics they are named LK101,LK102,LK103). By default, LK1-LK3 are not installed (Amstrad). Other combinations are LK2 installed in german Schneider models, and LK1+LK2 in australian Awa models.
| Bit 3 (LK3) | Bit 2 (LK2) | Bit 1 (LK1) | Distributor Name |
| 0 | 0 | 0 | Isp |
| 0 | 0 | 1 | Triumph |
| 0 | 1 | 0 | Saisho |
| 0 | 1 | 1 | Solavox |
| 1 | 0 | 0 | Awa (australian CPCs) |
| 1 | 0 | 1 | Schneider (german CPCs) |
| 1 | 1 | 0 | Orion |
| 1 | 1 | 1 | Amstrad (default) |
Note: "0" means LK installed.
Used Brand Names
Amstrad
Awa
Schneider
Somehow used
Solavox
Unused Brand Names
Orion
ORION is japanese company, founded 1958 by Shigemasa Otake. In an interview, Alan Sugar has confirmed that Amstrad planned to export CPCs to "far east", using Orion as a partner. As far as known, the partnership didn't worked in that direction - there have been no CPCs sold using the Orion brand. However, it worked the opposite way around: The CTM640/CTM644 and GT64/GT65 monitors contain cathode ray tubes from ORION.