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| 8800 CPU | Original Altair CPU board |
| 8800B CPU | 8800b CPU |
| 8800b Turnkey | Altair 8800B Turnkey Module. This board has a serial port, four 1702A prom sockets, auto-start logic, sense switches, and address switches. The original board has 1K of RAM. Newer verisions, remove or disable the RAM and optionally disable the proms after an output to IO port FF. This allows 64K of RAM after booting, without conflict with the prom addresses. |
| 8800 Front Panel | Front Panel Interface Board |
| Altair Z80 | Z80 CPU Board |
| 88-2SIO | Serial Interface Board - Two Ports, one port optional. The 2SIO is MITS best serial bourd. It uses the Motorola 6850 UART. |
| 88-SIOA | Serial Interface Board - RS-232 compatible |
| 88-SIOB | Serial Interface Board - TTL |
| 88-SIOC | Serial Interface Board - TTY |
| 88-ACR | Audio Cassette Record Interface |
| 88-PIO | Parallel I/O interface board. |
| 88-4PIO | Parallel I/O interface board - One port with the three ports optional. This board is used to interface to the hard disk controller in the 300/55 Business System. |
| 88-PMC | Prom Memory Card - 2K bytes using 256-bytw 1702A proms |
| 88-PMC8 | Prom Memory Card - 8K bytes using 2708 proms |
| 88-AD/DA | Analog to Digital/Digital to Analog converter |
| 88-ADC | Analog to Digital Converter |
| 88-DC | Disk Controller. Two board set. |
| 88-DMAC | Direct Memory Access Controller |
| 88-DMAI | Direct Memory I/O Channel for Internal Transfers |
| 88-DMAE | Direct Memory I/O Channel for External Transfers |
| 88-MUX | Multiplexor and buffer for for 88-ADC |
| 88-MM | Upgrades 88-1MCS to 1024K |
| 88-PCI | Process Control Interface |
| 88-VI/RTC | Vectored Interrupt/Reatl Time Clock. Required for Time-shared BASIC. |
| 88-MU1 | Note Systhesizer Board. The "Music Board." |
| 88-PPCB | Prototype Printed Circuit Board |
| 88-RBM | ROM BASIC I |
| 88-RMB2 | ROM BASIC II |
| 88-1MCS | 1K Static RAM Memory. This board may have as little as 256 bytes. Users can upgrade to 1024 bytes. |
| 88-2MCS | 2K Static RAM Memory |
| 88-S4K | 4K Synchronous RAM Memory |
| 88-4MCS | 4K Static RAM Memory |
| 88-16MCS | 16K Static RAM Memory. These are the best MITS memory boards. They usually work. If they don't, press the chips firmly into their sockets and run the MTST diagnostic. |
| 88-4MCD | 4K Dynamic RAM Memory. Collect this board, don't use it. The 16MCS is the memory of choice. Dynamic memory don't work well with an 8080. |
| 88-16MCD | 16K Dynamic RAM Memory Collect this board, don't use it. The 16MCS is the memory of choice. Dynamic memory don't work well with an 8080. |
| 88-EXC | Extender Card |
| 88-PPCB | Prototype Printed Circuit Board |
| 88-CENT-CB | Centronics Printer Interface. This is the equivalent to the printer port on the original IBM PC. It is not bi-directional. |
| 88-Q70 | Qume Line Printer and Controller Interface. A modified version supports the NEC Spinwriter. This is the 50-pin API interface. |
| 88-SE | Switch Selectable Entender Card |
| 88-DC | Diagnostic Card |
| 88-WWB | Wire Wrap Prototype Board |
| MITS Test Connector Board | Extender Board |
| MITS 8800 M/BD REV 0 | Four connector motherboard |
| Attache Video | Two-Board Piggyback. RS-232 video board pair. The boards only use power frrom the S100 Bus. Input is RS-232 and parallel keyboard cable. Output is composite Video. |
| 680-MB | Expander Board for 680b |
| 680-PCI | Process Control Interface for 680b |
| 680B-UIO | Universal I/O Board for 680b |
| 680-AD/DA | Analog to Digital/Digital to Analog converter |
| 680-BSM | 16K Static Memory Board fot the Altair 680b |
| 680-KCACR | Audio Cassette Interface for 680b ; Kansas City Standard |
| 680-MCD | 16K Dynamic Memory |
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