| Item | Original | Suggested | CPU Section |
| IC22 | 6502 | 65C02 | CPU |
| IC23 | 74LS138 | Decodes 4K memory blocks in top 32K | |
| IC44 | 74LS393 | 74HCT393 | Binary counters |
| IC9, IC45 | 74LS04 | 74HCT04 | Inverters for clock oscillators, reset, etc. |
| IC7 | 74LS02 | Helps detect first 1K | |
| IC8,48 | 74LS00 | ||
| IC49 | 74LS139 | I/O decoder | |
| X4 | 4.000 MHz | Quartz crystal | |
| ROM and RAM | |||
| IC10-19,51,52 | 2114 | 6264 or 62256 | 6K, 8K or 32K RAM |
| IC6 | 74LS138 | Decoder for 2114 chips | |
| IC20 | MM52164 | 27128 | 8K ROM at 0xFXXX and 0xCXXX Atom BASIC and COS |
| IC21 | MM52132 | 4K ROM at 0xDXXX Atom Floating Point | |
| IC24 | MM52132 | 2732 | 4K ROM at 0xAXXX Utility ROM |
| Keyboard and I/O | |||
| IC1 | 6522 | 65C22 | User I/O and/or printer port |
| IC50 | 74LS244 | 74HCT245 | Printer port buffer |
| IC25 | 8255 | 82C55 | PPI |
| IC26 | 7445 | Keyboard column decoder | |
| Tape interface | |||
| IC46 | LM358 | Op-Amp for tape input | |
| IC47 | 74LS161/163 | 74HCT161/163 | Counter for tape interface |
| Expansion bus | |||
| IC2 | 8304 | 74HCT245 | Expansion bus data buffer |
| IC3,4 | 81LS95 | 74HCT245 | Expansion bus address buffers |
| IC5 | 74LS30 | Expansion bus buffer enable | |
| Video section | |||
| IC31 | 6847 | CRT controller | |
| IC30 | 74LS138 | 6264 | Decoder for 2114 chips |
| IC32-43 | 2114 | Video RAM | |
| IC27,28 | 81LS95 | 74HCT245 | Video RAM address buffers |
| IC29 | 8304 | 74HCT245 | Video RAM data buffer |
| X1 | 3.575945 MHz | Quartz crystal | |
| Power | |||
| IC53,54 | LM340T-5 | 5V regulators | |
| C12 | 22 uF | Input voltage capacitor | |
| C13 | 22 uF | 5V decoupler, LF | |
| C14-28 | 47 nF | 5V decouplers, HF | |
| Misc | |||
| L1 | 1 mH | Choke | |
| SK1 | UHF modulator | ||
| SK2 | 7-pin DIN | ||
| SK3 | Power socket | ||
| Q1,Q2 | BC107 | NPN transistors | |
| C1,6,10 | 10 nF | ||
| C2-5, 8,12,13 | 22 uF, > 10V | LF decoupling | |
| C7 | 47 or 100 nF | ||
| C9 | 22 or 47 nF | ||
| C11 | 10 uF |