The HP 9000 model 216 is a follower of earlier desktop calculator's models, such as the HP 9825, HP 9845 etc. The HP 9000 216 is known as HP 9816, it is the smallest member of the 9000 family. It has no hard disc, no floppy disc. The original keyboard was very small and connected by a detachable cable. It was often substituted with large heavy keyboard for HP 9000 220 computer. The computer electronics is located on large mainboard which is inserted into 9 inch monochrome monitor. The mainboard contain RS 232C and HP-IB interface and it has short bus for two expansion slots. The major change for HP, the 9000 models no longer used HP custom CPUs but instead used an 8 MHz Motorola 68000. Also, the 9000 216 did not have a built-in language like 98xx desk-top calculators, instead it used disk-based languages. A HPL known from HP 9825 and BASIC and Pascal were available. For this purpose, the HP 9121 floppy disc unit was connected to HP-IB interface 9000 216 computer.It was possible to have all three languages on one disk and tell the computer which one to load at boot up.

A rear side of the HP 9000 216 cabinet. Left bottom is serial connector. In the bottom midle HP-IB connector and bottom right is a keyboard connector. Above the connectors is removable cover plate for two expansion cards.

HP 9000 216 - mainboard PN: 09816-66514B The HP 9000 216 is a single board computer based a 8 MHz CPU Motorola M68000. At right from CPU is 256 kB memory (32x 64x1 bit). The ROM is splited into four circuits - odd upper and lower ROM and even upper and lower ROM. Only the lower ROMs are used. The connector (3x 32 pins) in the mainboard's centre provides connection to expansion boards. The HP-IB interface is based TMS9914 controller. Size is 262 x 228 mm.

HP 9000 216 - expansion bus PN: 09816-66561B The HP 9000 216 has two expansion slots accessible from rear of the computer. The connection between expansion boards and mainboard provides expansion bus board. The lower female connector 3x 32 holes is dedicated to mainboard. The two black PCB connectors (2x48) are for expansion boards. The upper white connector (2x32 pins) is dedicated to CRT circuits board.

HP 9000 216 - CRT circuits PN: 09816-66571C The CRT circuits board is located on top and connected to the mainboard through expansion bus board. This board provides all analog signals to CRT. In the centre is a high voltage transformer and 2x48 pin connector to expansion bus. Closed to edge are two white connectors. One for video memory, second for synchronization and timing board.

HP 9000 216 - CRT controller PN: 09816-66582A The CRT controller is based on MC6845 CRT circuit. The board provides all timing and synchronization signals. The board is inserted into 3x32 pin connector at right edge on the CRT analog board.

HP 9000 216 - CRT memory PN: 09816-66591B The CRT memory board has capacity 16 kByte and uses eight 16Kx1 bit DRAM integrated circuits type 2118 with support TTL circuits providing WE, RAS and CAS timming signals. The board is inserted into 2x32 pin connector at right edge on the CRT analog board.

HP 9000 216 - Power Supply PN: none The power supply for HP 9000 216 is made by third party, Power Mate Corp. in US. The unit gives +5V / 6A, +14V / 1.6A and -14V / 0.5A. The input voltage is either 115V or 230V AC. The output voltage is connected into RT analog board.

HP 9000 216 - Memory expansion 1MB PN: 98257-66524 This is a memory expansion board with capacity of 1MB with parity. On the board are 36x 41256 DRAM integrated circuits (256K x 1 bit) and support TTL logic. The DIP switch set the address of the first byte on the expansion board. You could have in the computer one 98257 board or combine it with one 98256 board.

HP 9000 216 - Memory expansion 256 kB PN: 98256 This is a memory expansion board with capacity of 256 kB. On the board are 32x 4164 DRAM integrated circuits (64K x 1 bit) and support TTL logic. The DIP switch set the address of the first byte on the expansion board. You could have in the computer one 98256 board or two 98256 boards or combine one 98256 board with one 98257 board.