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
1-6 ISA slots
5 AT-Coprocessor slot
Ed. The slot 1-8 depictions are probably all
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
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)