Plus/4 Assembly 310163-01
Released in 1984.
Version: A
Schematic Number 310164.
Specs
CPU : 8501/7501 @ 0.885/1.76
MHz
RAM : 64kB DRAM
ROM : 32kB ROM Total - 16K BASIC, 14K Kernal, 2K Character (additional 32kb ROM for integrated software)
Graphics : TED 8360
Sound : TED 8360
Interfaces : 2 Control Ports, A/V, Datasette Port, Expansion Port, Serial IEC, TV RF, User Port
Keyboard : 67 Keys
Power Supply : External Transformer (9V AC + 5V DC)
Schematics
Fig. 1: Plus/4 310163-01 Mainboard
Fig. 2: Plus/4 310163-01Layout
Capacitor List
Cap - Value - Rating - Type
C1 - 100uf - 16v - Radial
C7 - 2200uf - 16v - Axial
C8 - 10uf - 16v - Radial
C17 - 10uf - 16v - Radial
C18 - 10uf - 16v - Radial
C20 - 10uf - 16v - Radial
C22 - 10uF - 16v - Radial
C23 - 1uf - 16v - Radial
C27 - 10uf - 16v - Radial
C30 - 10uf - 16v - Radial
IC List
| PCB ID | Chip ID | Notes |
| U1 | 8360/7360 | TED |
| U2 | 8501/7501 | Processor |
| U3 | 6551A | ACIA |
| U4 | 74LS08 | Logic AND |
| U5 | 6529B | SPI |
| U6 | 74LS04 | HEX Inverter Buffer |
| U7 | 7406 | Hex Inverter Buffer |
| U8 | 555 | Timer |
| U9 | 74LS257 | Multiplexor |
| PCB ID | Chip ID | Notes |
| U10 | 74LS257 | Multiplexor |
| U11 | 4164-2 | DRAM |
| U12 | 4164-2 | DRAM |
| U13 | 4164-2 | DRAM |
| U14 | 4164-2 | DRAM |
| U15 | 4164-2 | DRAM |
| U16 | 4164-2 | DRAM |
| U17 | 4164-2 | DRAM |
| U18 | 4164-2 | DRAM |
| PCB ID | Chip ID | Notes |
| U19 | 7700 | PLA |
| U20 | 74LS139 | Demultiplexor |
| U21 | 74LS175 | Quad D-Type Flip Flop |
| U22 | 74LS27 | Triple 3-Input NOR Gate |
| U23 | 23128 | ROM - Basic |
| U24 | 23128 | ROM - Kernal |
| U25 | 23128 | ROM - Function Low |
| U26 | 23128 | ROM - Function High |
| U27 | 6529B | SPI |
Downloads
