ZX Spectrum +2
The gray 128 with a built-in cassette deck.
Open the ZX Spectrum +2 in Retro Bench- Also
- Spectrum +2 (gray)
- Year
- 1986
- CPU
- Z80A @ 3.5 MHz
- RAM
- 128 KB (banked)
- ROM
- Two 16 KB ROM banks
- Video
- Gate array: 256 x 192, 8 colors
- Sound
- AY-3-8912 + beeper
- OS
- 128K BASIC, built-in tape deck
Chips
| Chip | Where | Role |
|---|---|---|
| Z80A CPU | IC9 | Main CPU (8-bit, 40-DIP) |
| Spectrum 128 / +2 / +3 ULA or gate array | Video, memory banking, ports (7K010E-5 on the 128; Amstrad 40056/40077 on later models) | |
| AY-3-8912 sound chip | IC4 (AY-3-8912A) | Three-voice programmable sound generator with one 8-bit I/O port |
| 4164 DRAM 64K×1 | IC17-IC32 (KM4164B-15P) | Main RAM (8 chips = 64 KB) |
Ports and connectors
- Power in, DC power socket UNVERIFIED
- TV (RF out), TV socket (RF) UNVERIFIED
- SOUND out, Sound output socket UNVERIFIED
- RGB monitor, DIN 8-pin 270° socket UNVERIFIED
- Joystick 1 and 2, DE-9 male (two identical sockets) UNVERIFIED
- RS232 / MIDI, BT-style 6-way socket UNVERIFIED
- Keypad, BT-style 6-way socket UNVERIFIED
- Rear edge connector (2 x 28), Card edge, 28 + 28 positions, keyway at 5 UNVERIFIED
Symptoms
- ON lamp not lit
- No picture at all
- Picture garbled, sound present: check ULA 128, Z80A, 4164
- Picture but no sound
- No menu after RESET
- Menu bar will not move, dead keys: check ULA 128
- Test ROM shows only a colored border: check 4164
- Tape will not load, or loads with odd results: check 4164, ULA 128