The machine is not mine, I borrowed one from Lino Lampers the main IBM collector (post 1980) in the country.
|IBM PC RT 6151||The case is very similar to the original PC AT case. The main difference is the two-digit hex post display.|
|IBM PC RT CPU||The aluminium coveraging of chips is typically for IBM designs. These chips make up the RT processor. The board contains some MMI PAL-logic, a Motorola support chip and a boot EPROM. Below are the other special cards for the PC-RT. The I/O; disk, display, network and serial ports are provided by 'normal' 8- or 16-bit ISA cards.|
|IBM PC RT CO-processor||This board set is an option. It contains two Analog Devices chips; an ADSP-3210 (floating point multiplier and ALU) and an ADSP-3221 ().
The extension board contains several fast (cache like) RAM chips.
|IBM PC RT RAM board||Here also the typically IBM chip housing. The early IBM PS/2s also used this type or RAM. This board could be either 4 or 8 MByte.|
|FDC/ESDI board & network board||At the top the FDC and ESDI harddisk controller, at the bottom an Ungermann-Bass network adapter.|
|Megapel Display Adapter||These boards form one adapter. Best put into slot 2 and 3 (from the left, slot 1 being only 8 bits). The proper display is the IBM 5081 Display monitor. Output is RGB, sync on green, H:63.36 kHz, V:60Hz. DIP switch 3 controls the CGA emulation.|
|Keyboard/Mouse ports||Very weird connectors. The actual pins are standard 0.1" pins for both keyboard and mouse, but the shape of the holes made connecting foolproof. An improvement to the DIN-connectors used for the original PC/PC XT and PC/AT, but not yet the standard of PS/2. The mouse is the left port, the keyboard right.|
|Keyboard/Mouse connectors||A bit dirty, but the construction is clear. The keyboard is left, the mouse right.|
|Mouse internals||The mouse interior. A complete HD6303A01XOF processor (derived from the 6801) and a propriatairy protocol.
IBM RT mouse Part No OOF2383 As seen into the plug (female) ___________ | | || 1 3 5 || | 2 4 6 | |_________| plug wire J1 function 1 (green) 5 = signal ground. 2 (blue) 1 = Transmit to device. 3 (orange) 4 = +12 Volts 4 (yellow) 3 = -12 Volts 5 (brown) 6 = +5 Volts 6 (red) 2 = Receive from device. (black) 7 = protective ground
Last updated: 2010-08-08