VMEbus 10 pcb ex University designed and made for an old course

[inotarobot]

Well further to my general post on getting these 10 pcb along with a lot of other computer related bits this last weekend I am going to do this post on these 10 boards.

To start there are

TYPE 1 these are the 4 on right side of above pic.

2 boards marked VMEIOBus COMP/MATHS LS086111 with backplane connectors P1 & P2 populated
main 40pin chip Signetics SCN68681C1N40 & crystal 3.6864meg & Motorola MC68901P
&
2 boards marked VMEIOBus COMP/MATHS LS086111 with backplane connectors P1 only populated
main 40pin chip Signetics SCN68681C1N40 & crystal 3.6864meg & Motorola MC68901P

TYPE 2

2 boards marked LS0861010 Motor Drive /2 ; Digital Out /8 ; Digital In/8 ; 8 Bit A/D 16 Ch (ADC0817CCN) Backplane P1 only populated

TYPE 3

2 boards marked VMEIOBus COMP/MATHS LS0861298 12BIT A/D with backplane connectors P2 only populated with Analog devices AD364JD AIS ( the big silver chip) and AD364JD ADC (gold top)

TYPE 4

2 boards VME format pcb no ID markings with backplane connectors P2 only populated
both Main 40pin Chips are GI AY-3-8901 & 24pin chip is SSI 263P 2 post marked Vol 1 & 2

 

[inotarobot]

Just got a call from the retired Technician/Electronics Engineer that worked at the University the boards came from.

He has no documentation on then and feels none exists even at the Uni.

Further he cannot verify that the design followed the VME Standard 100%, so I guess time will tell.

 

[inotarobot]

Regarding the two boards marked VMEIOBus COMP/MATHS LS0861298 12BIT A/D, and with backplane connectors P2 only populated; I looked up the Analog Devices Data sheet and the 2 big chips on this pcb make up the A/D part.

They have an Analog devices AD364JD AIS, (the big silver chip) being the 16 channel Single ended or 8 channel Differential input section; and an AD364JD ADC (gold top) tha contains the Analog to Digital converter part of this 2 chip A/D system.

So each of the 8 blue connectors on top edge of board relate to analog inputs either

a.. 2 channels of single ended or b.. one channel of Differential analog signal input.

has 5 user selectable input voltage ranges +/- 2.5v or +/-5v or +/-10v or 0 to +5v or 0 to +10v

with a 32us conversion time and a linearity of +/- 0.012%

 

[inotarobot]

Quick post as I just noted the labelling on the "TYPE 2" board for the P1 and P2 connectors seems to be marked in a non standard in way.
So I just checked all boards and this is what I have seen

All the P1 connector holes on the PCB's are 3 row of 32 (A,B,C) and the P2 connector holes are 2 row of 32 (A,C) holes

so to explain

TYPE 1 these are the 4 on right side of pic in first post. (2 have P2 connector installed 2 dont)

2 boards marked VMEIOBus COMP/MATHS LS086111 with main 40pin chip Signetics SCN68681C1N40 & crystal 3.6864meg & Motorola MC68901P

P1 has 96ways A,B,C & P2 64way A & C populated

& 2 boards marked VMEIOBus COMP/MATHS LS086111 with backplane connectors
P1 has 96 ways A,B,C only populated. P2 holes have tracks to them


TYPE 2

2 boards marked LS0861010 Motor Drive /2 ; Digital Out /8 ; Digital In/8 ; 8 Bit A/D 16 Ch (ADC0817CCN)

Backplane P1 only populated However this is ACTUALLY P2 location on the std and has a connector 64way A & C populated Top ie P1 connector area has 96 holes but no tracks leading to/from them and NO connector fitted


TYPE 3

2 boards marked VMEIOBus COMP/MATHS LS0861298 12BIT A/D with backplane connectors P2 only populated with Analog devices AD364JD AIS ( the big silver chip) and AD364JD ADC (gold top)

P2 location on the std and has a connector 64way A & C populated Top ie P1 connector area has 96 holes but no tracks leading to/from them and NO connector fitted


TYPE 4

2 boards VME format pcb no ID markings with backplane connectors P2 only populated
both Main 40pin Chips are GI AY-3-8901 & 24pin chip is SSI 263P 2 post marked Vol 1 & 2

P2 location on the std and has a connector 64way A & C populated Top ie P1 connector area has 96 holes but no tracks leading to/from them and NO connector fitted

 

[Chuck(G)]

Looking at the traces, it's obvious that these boards must have had some manual work done on the artwork. Just curious, were these tape-and-dot layups?