Portable 65C02 machine: MMU, IOU, TMG and GLU custom chips, an IWM for the built-in drive, two 6551 serial ports and an external 15 V brick.
| Chip | Where | Role |
|---|
| 6502 / 65C02 CPU | | CPU |
| IIc MMU (Memory Management Unit) | | Memory management and RAM address multiplex |
| IIc IOU (Input/Output Unit) | | Video timing, soft switches, mouse and keyboard I/O |
| IIc TMG (Timing Generator) | | Master clock divider and RAM/video timing |
| IIc GLU (General Logic Unit) | | I/O decode, RAM read/write timing, double hi-res |
| IWM 344-0041 Integrated Woz Machine | | Floppy disk controller |
| 6551 ACIA | | RS-232 serial (Plus/4 only) |
| AY-5-3600 Keyboard Encoder | UB16, marked KEY (schematic 050-0093-A sheet 3/5); the photographed board has an AY-5-3600-PRO (silk KR3600-PRO, ENC) | Keyboard encoder |
| 23256 mask ROM 32K x 8 | Firmware ROM marked MON (342-0033-A, a 23256 32K x 8 mask ROM on the photographed board); designator not read | 32K x 8 mask ROM in the 27256 pinout. |
| 2732-pinout 4K x 8 ROM | UE4, marked CHAR GEN: 342-0265-A on the photographed board. Schematic 050-0093-A sheet 2/5 draws a 28-pin 2732/2764 site with 2764 pin numbers, so add 2 to the pin numbers below. | Character ROM in the 2732 pinout: IIe and IIc video ROM (4K x 8); PCjr character ROM (2K x 8 fitted, socket wired for a 2716 or 2732) |
| 2716-pinout 2K x 8 ROM | UD16, keyboard ROM marked MAP, 342-0132 | Keyboard ROM of the IIe and IIc, in a socket drawn for a 2716 EPROM |
| 4164 DRAM 64K×1 | Silk ARD0-ARD7 and MRD0-MRD7: 16 x 64K x 1 (TMS4164 on the photographed board) | Main RAM (8 chips = 64 KB) |