INMC 80 News

  

May-September 1981, Issue 4











Page 30 of 71











-30-

generate a vector would assert one of these lines when it required to interrupt, expansion cards availing themselves of this facility should provide it via links so that the particular line can be selected by the user.

Line 63, /PWRF.

Powerfail warning. This line is to be taken low 100mS before the power rails

drop by more than 5% and held low until 100mS after the power on reset. For use by backup memory etc. Optional signal which would be provided by the power supply circuitry if implemented.

Line 64, AUX PWR.

An auxilary +5 volt supply for the use of backup devices. Absolute maximum

current when the main power supplies are off is 100mA. Implementation is optional.

Lines

there

65 66, NDEF1 NDEF2. Not to be defined. These are lines for users to allocate as they require, are only two restrictions and one provision.

a)TTL levels only, ie no voltage greater than 5 volts and no voltage less than 0

volts.

b) No transition until 100nS after the previous transistion, ie don’t put a 16MHz

clock

on this line.

c) A link must be provided to disable the use of NDEF 1,2.

Line 67, GND.

bus.

Lines

Lines

An additional ground line to separate the power lines from the rest of the

68,69, -5 volt supply.

70,71, -12 volt supply.

Line 72, Keyway

Lines

Lines

73,74, +12 volt supply. ‘

75,76,77,78, +5 volt supply.

chains :

16 --------- K- 16 ------+--K- 16 Tr I

17 -X--------- 17 =X--------- 17 :

:

19 w-a----=- K-19 -annene ee X- 19 ,

I I –

20 -X--------- 20 -X--------- 20 :

SLOT 2 SLOT 1 SLOT 0 ;

Expansion cards Bus Master ‘

X = Cut of bus track I = Link between tracks


This is an OCR’d version of the scanned page and likely contains recognition errors.











Page 30 of 71