6150 Tower

186-006 6150 RT PC 020, 025, A25 and 6151 RT PC 010

Six 16-bit and two 8-bit feature slots on models 020 and 025,
Five 16-bit and one 8-bit feature slots on model 010.
Two asynchronous (RS-232C) serial ports with direct memory access on models 020 and 025.

Rear of 6150

6150 RT Tower Planar

A Processor Board
B Floating Point Board
C Memory Option
D Memory Option
KB Keyboard
M Mouse
1-6 ISA slots
5 AT-Coprocessor slot

Ed. The slot 1-8 depictions are probably all hosed up.

Slot 5 AT-Coprocessor slot

The IBM RT 6150 and 6151 system units use ISA (AT) style I/O slots, however slot 5 on the 6151 and slot 8 on the 6150 are unique to the RT. Most cards that do not use memory refresh, or DMA channel 7 will have no problem with that slot. Bus timings for all the RT bus slots may be slightly different from an AT, as I/O accesses are not driven by the processor directly, but are routed via a special bus processor in the planar, called the IOCC.

The 8th slot in the 6150 RT (5th slot for 6150 only) have three signals different from the normal PC/AT assignments.

 Pin    Standard     CO-proc slot usage    My notes.. 
 B19    REFRESH      + SPK DRV             (Wire or'd to speaker control)
 D14    DACK 7       - DACK 8              DMA channel is reassigned..
 D15    DRQ 7        + DRQ 8                 .. ditto

The PC XT mono/printer adapter, is ONLY supported in slot 3 in the 6150 tower, or ONLY in slot 1 in the 6151 desktop. (I'm not sure why this slot 3 restriction is here, what's wrong with slot 6? Timing? - MW)

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Louis F. Ohland, Peter H. Wendt, David L. Beem, William R. Walsh, Tatsuo Sunagawa, Tomáš Slavotínek, Jim Shorney, Tim N. Clarke, Kevin Bowling, and many others.

Ardent Tool of Capitalism is maintained by Tomáš Slavotínek.
Last update: 08 May 2024 - Changelog | About | Legal & Contact