NI MC-MXI
@0DFF.ADF "National Instruments MC-MXI Adapter" 
MC-MXI User Manual May 1994, Part Number 320297-01
NI-VXI software for Win3.x   ?

MC-MXI Adapter, Top [image from Artisan Technology Group]


Three large-scale components:
• SMC 94C18 Micro Channel controller chip implements the mandatory logic functions of the Micro Channel bus and contains support for the POS registers and some local configuration registers.
• The National Instruments Message-Based Interface Gate Array (MIGA) implements the MXIbus registers.
• The Intel 82C54 Peripheral Interface Timer (PIT) contains registers that establish time limits for Micro Channel and MXIbus operations.

My SWAG is the SIX internal MXI bus terminators are the DIP resistor networks just to the left of the DB62 connector. Or maybe they are the light colored SIPs?

MC-MXI Adapter, Bottom [image from Artisan Technology Group]


DB62 Connector Pin-out [MXIbus]


Pin
 Signal
 Pin
 Signal
 Pin
 Signal
1
 AM4* 22
 AD15* 43
 PAR*
2
 AM3* 23
 AD14* 44
 SIZE*
3
 AM2* 24
 AD13* 45
 BREQ*
4
 AM1* 25
 AD12* 46
 BUSY*
5
 AM0* 26
 AD11* 47
 GND
6
 AD31* 27
 AD10* 48
 GND
7
 AD30* 28
 AD09* 49
 GND
8
 AD29* 29
 AD08* 50
 GND
9
 AD28* 30
 AD07* 51
 GND
10
 AD27* 31
 AD06* 52
 GND
11
 AD26* 32
 AD05* 53
 GND
12
 AD25* 33
 AD04* 54
 GND
13
 AD24* 34
 AD03* 55
 GND
14
 AD23* 35
 AD02* 56
 GND
15
 AD22* 36
 AD01* 57
 GND
16
 AD21* 37
 AD00* 58
 GND
17
 AD20* 38
 DS*
 59
 GOUT*
18
 AD19* 39
 AS*
 60
 GIN*
19
 AD18* 40
 WR*
 61
 IRQ*
20
 AD17* 41
 DTACK*
 62
 TERMPWR
21
 AD16* 42
 BERR*


* means signal is active low

ADF Sections 0DFF.ADF "National Instruments MC-MXI Adapter"

NumBytes 4

FixedResources
    pos[0]=1XXXXXXXb

Memory Window for MC-MXI DOS 
   The DOS interface can use 7 different windows. Choosing 'None Requested' will not allow DOS NIVXI applications to execute, and should only be used to avoid memory conflicts.
  <"0d0000h-0dffffh">, c0000h-0cffffh, 0b0000h-0bffffh, 0a0000h-0affffh, 090000h-09ffffh, 080000h-08ffffh, None Requested, 0e0000h-0effffh

Memory Window for MC-MXI Windows  
   The Windows interface can use 3 different windows. Choosing 'None Requested' will force Windows NIVXI applications to use the DOS (lower memory) window, and should only be used to avoid memory conflicts."
      <"f9ff0000h-fbffffffh>, b9ff0000h-bbffffffh, 79ff0000h-7bffffffh, None Requested

I/O Register Area
   I/O register areas.
      <"0c000h-0d7ffh">, e000-f7ff, 0000-17ff, 2000-37ff, 4000-57ff, 6000-77ff, 8000-97ff, a000-0b7ff

Bus Interrupt Level  
   Change only if in conflict with another assignment
      <"10">, 11, 15, 5

LA Interrupt Level [Logical Address]
   Change only if in conflict with another assignment
      <"10">, 11, 15, 5

MXI Master DMA Arbitration Level   All levels EXCEPT "NONE"are commented out.  
   Change only if in conflict with another assignment. This is currently disabled.
<"   3">, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, None, 0, 1, 2

MXI Slave DMA Arbitration Level 
   Changed only if in conflict with another assignment
    <"   8">, 9, 10, 11, 12, 13, 14, None, 0, 1, 2, 3, 4, 5, 6, 7

Local (MC) Bus Fairness On/Off 
   Whether control of the local (Micro Channel) bus is released when it has been used it exclusively.  Under normal circumstances, select <On>.
    <"On ">, Off