| TRS-80 Model I from 1978 | |
| CPU: | Z80 @ 1.77MHz |
| RAM: | 16KB |
| ROM: | Level II BASIC |
| Display: | 12" white CRT monitor (26-1201) |
| Ports: | video, cassette, power, expansion interface |
| Catalog No.: | 26-1006 |
| Serial No.: | |
| Catalog Price: | $789 |
| Notes: | This unit has had several modifications installed: there are 4 switches (2 pushbutton and 2 toggle) added to the case. The upper left pushbutton is another Reset Button. The lower left pushbutton appears to be a Control key (Shift/Down-Arrow). The toggle switches are for a lower case modification. The system was not quite working when I got it: the video didn't sync. It turns out that there was a bad inverter in both the horizontal and vertical sync circuits. After I replaced two 74C04 chips (Z6 and Z57), it works fine. |
