      CONNECTIONS MK-SCSI INTERFACE vanuit slotconnector naar Eprom
      
			 CONTROLLER NCR 5380 CP07654
SLOT	    EPROM
	    27512

 1  CS1     20 OE
 4  SLTSL   22 CE
  (via 47nF aan GND)
 9  M1
10  BUSDIR					   24
11  IORQ
12  MERQ
13  WR
14  RD
15  RESET					   28
17  A 9      2 (A12)
18
19  A 11     3 A7
20  A 10    26 A13
21  A 7      4 A6                                  15
22  A 6     25 A8                                  14
23  A 12     5 A5    1
24  A 8     24 A9
25  A 14             6
26  A 13    23 A11   2
27  A 1      6 A4             2                                   32
28  A 0     21 A10            3                                   30
29  A 3      7 A3                                     4
30  A 2      9 A1             1                                   33
31  A 5      8 A2                                     2
32  A 4     10 A0                                    17
33  D 1     11 D0                                          4      40
34  D 0     19 D7                                         13       1
35  D 3     12 D1                                                 38
36  D 2     18 D6                                                 39
37  D 5     13 D2                                                 36
38  D 4     17 D5                                                 37
39  D 7     15 D3                                                 34
40  D 6     16 D4                                                 35

74LS175 Latch voor 16k keuze 	Data omvorming door verwisselde bedrading
    eprom (dos2)      
			      Benodigde data:	 bits  7  6  5	4  3  2  1  0
1  +5V			      Wijzigen voor MK-scsi   3  4  2	5  1  6  0  7
2  Eprom 1  = A15	     
4  Eprom 11 = D0 (data D1)    Highbyte adres:	     A 15 14 13 12 11 10 9  8
5  +5V			      Wijzigen voor MK-scsi A 15 14 11 5  7  13 12 9
8  +5V			     
9  Via 47nF aan SLTSL (clock) Lowbyte adres:	     A 7  6  5	4  3  2  1  0
12 Ground		      Wijzigen voor MK-scsi A 6  8  2	0  3  1  4  10
13 Eprom 19 = D7 (data D0)   
15 Eprom 27 = A14	     
16 Ground		     













	74LS175 Quad latch	            74LS138/1 Multiplexer 1 off 8
		            
 1 nClear   +5			        1  Sel A   Slot-A12
 2  1Q	    Eprom-1 (A15)	        2  Sel B   Slot-A13
 3 n1Q	    --			        3  Sel C   Slot-A15
 4  1D	    Slot-D1 ---> Eprom-11       4 nG2A    nSLTSL
 5  2D	    +5			        5 nG2B    nMERQ
 6 n2Q	    --			        6  G1	    Slot-A14
 7  2Q	    --			        7 nY7	    --
 8 Gnd	    Ground		        8  Gnd     Ground
 9 Clk	    LS32-6 (nWR.nY2 van 138/1)  9 nY6	    --
10  3Q	    --			       10 nY5	    --
11 n3Q	    --			       11 nY4	    --
12  3D	    +5			       12 nY3
13  4D	    Slot-D0 ---> Eprom-19      13 nY2	    LS32-4
14 n4Q	    --			       14 nY1	    --
15  4Q	    Eprom-25 (A14)	       15 nY0	    --
16 Vcc	    +5			       16  Vcc     +5
  Write naar #06xx --->  #00 t/m #03  
  voor keuze DOS-deel v.Eprom A14/A15  nY2 = nSLTSL.nMERQ.nA15.A14.A13.nA12

	74LS32 Quad OR		            74LS138/2 Multiplexer 1 off 8
			            
 1  1in   Contr-13		        1  Sel A   Slot-A2
 2  1in   +5			        2  Sel B   Slot-A1
 3  1out  560R ---> LED ---> +5V        3  Sel C   Slot-A0
 4  2in   LS138/1-13 (nY2 van 138/1)    4 nG2A     LS688-19 (& LS32-10-13)
 5  2in  nWR			        5 nG2B     Ground
 6  2out  LS175-9		        6  G1	    Contr-22
 7  Gnd   Ground		        7 nY7	    --
 8  3out  LS00-5 ---> Contr-29	        8  Gnd     Ground
 9  3in  nWR			        9 nY6	    --
10  3in   LS688-19 (& LS138/2-4)       10 nY5	    --
11  4out nBUSDIR		       11 nY4	    --
12  4in  nRD			       12 nY3	    --
13  4in   LS688-19 (& LS138/2-4)       13 nY2	    --
14  Vcc 			       14 nY1	    --
				       15 nY0	    LS00-2-13
n1out = nContr13 = LED aan	       16  Vcc     +5
n2out = nWR.nY2(van 138/1)	      
n3out = nWR.n[P+Q]		       nY0 = Contr22.n(P+Q).nA0.nA1.nA2
n4out = nRD.n[P+Q]  (Busdir=data/out) 

      74LS00 Quad NAND	     	      74LS688 Magnitude comparators
      	     	      
 1  1in     Pin 6 & 9	     	1  GND	  Ground	11  P4	  nM1
 2  1in     LS138/2-15	     	2  P0	  A5		12  Q4	   +5
 3  1out    Contr-21	     	3  Q0	  Ground	13  P5	   +5
 4  2in    nBUSDIR	     	4  P1	  A3		14  Q5	   A6
 5  2in     LS32-8	     	5  Q1	  Ground	15  P6	   A7
 6  2out    Pin 1 & 9	     	6  P2	  Ground	16  Q6	   +5
 7  GND     Ground	     	7  Q2	  Ground	17  P7	   A4
 8  3out    Pin 12	     	8  P3	  Ground	18  Q7	   +5
 9  3in     Pin 1 & 6	     	9  Q3	  IORQ		19 nP+Q    LS32-10-13
10  3in     Pin 11	      10  GND	  Ground	20  Vcc    +5
11  4out    Pin 10	     
12  4in     Pin 8 & Contr.26 
13  4in     LS138/2-15	     	nP+Q = M1.A7.A6.nA5.A4.nA3
14  Vcc     +5		     		   1  1  0  1  0






		       SCHAKELING MK-SCSI INTERFACE
		       
		    ("n" betekend: Signaal low-active)
	    OR Ŀ
Contr-13 Ĵin	    
     +5V Ĵin	 out> Weerstand 560 Ohm > LED > +5V
	   

	  74LS688
	Ŀ				     [ IN poort #D? ]
  Gnd ĴP0    nG Gnd	    OR Ŀ	(nIORQ.nWR.A7.A6.nA5.A4.nA3)
   A5 ĴQ0	 	     nRD Ĵin	 out> nBUSDIR
  Gnd ĴP1    P7 A4   Ĵin	    
   A3 ĴQ1    Q7 +5   	   	     [ OUT poort #D? ]
  Gnd ĴP2    P6 A7   	    OR Ŀ	(nIORQ.nRD.A7.A6.nA5.A4.nA3)
  Gnd ĴQ2    Q6 +5   Ĵin	 out> Contr-29
  Gnd ĴP3    P5 +5     nWR Ĵin	      
nIORQ ĴQ3    Q5 A6   	     
  nM1 ĴP4	 	  		       
   +5 ĴQ4  nP+Q	   
	   		   
		     		      NAND Ŀ       NAND Ŀ
			   Ĵin   outĴin   outĿ
			   nBUSDIR Ĵin         Ĵin       
				           
	   74LS138/2				   Ŀ	 
	  Ŀ				    (flipflop)
	ĴnG2A    				   	   Ŀ
     Gnd ĴnG2B    				     NAND Ŀ 
Contr-22 Ĵ G1     (nIORQ.M1 & I/O adres #D0)    Ĵin   out> Contr-26
	   	 nY0Ĵin      
	   	    		       	     
      A2 ĴSel A   		       	      NAND Ŀ
      A1 ĴSel B   		       	 Ĵin   out> Contr-21
      A0 ĴSel C   		      Ĵin      
	   				      


			   DOS 2 - SELECTIE 16k
			   
		    ("n" Betekend: Signaal low-active)
	  74LS138/1
	 Ŀ
nSLTSL ĴnG2A	  
 nMERQ ĴnG2B	  
   A14 Ĵ G1	   (nSLTSL.nMERQ.nA15.A14.A13.nA12)
	      nY2Ŀ
	 	  	       OR Ŀ (Write data naar adres #6xxx)
   A12 ĴSel A   	    Ĵin   outĿ
   A13 ĴSel B   	nWR Ĵin	   	   74LS175
   A15 ĴSel C   	          	Ŀ
	 			    ĴnClock   
						 Ŀ 
				     Slot D1 ĴD   Q> Eprom-1 = A15
						    nQ
						 Ĵ 
				     Slot D0 ĴD   Q> Eprom-19 = A14
						    nQ
						 Ĵ 
					  +5 ĴD   Q
						    nQ
						 Ĵ 
					  +5 ĴD   Q
						    nQ
						  
						


