Six printed circuit cards assembled into a unit with multicore flat strap IDC cabling between cards. The cards have the electronics required for a small kit computer originally designed to demonstrate the MOS Technology 6502 microcomputer.
The top card is a half-size front panel with input and output patch-plug connectors (eight of each) on either edge of the top card plus two control connectors each and three holes marked 'RESET', 'NMI' (non-maskable interrupt), and 'IRQ' (interrupt request) with wires led through them. The card immediately below this card distributes wires attached to the patch plug input and output connector to the rest of the cards.
The main card carries the processor, port expansion and memory access control chips in IC sockets. These are the MCS6502 central processing unit (CPU) chip in a 40pin "dual-in-line" (DIL) white ceramic package with a gold chip cover, a MCS6530 read only memory (ROM) programmed with a "monitor" - device initialisation and terminal (VDU, or keyboard and character display) software - and debugging software, a Peripheral Interface and Memory control device also in a 40pin DIL white ceramic chip carrier and a Motorola XC6820 (engineering sample version of the MC6820) CPU support chip. It also has 10 MSI (medium scale integration) chips which electronically connect the CPU card to the memory and input/output cards.
Assembled below the CPU card are three identical memory cards each having 32 x AMD 2111 static random access memory (SRAM) chips.