B2000 Schematics Question

Brass · 06 July 2012, 16:19

Hi Everyone,

I have the B2000 schematics which I have no problems reading ; however there is something on the schematics which I have never seen before as an example looking on the first page of the schematics which has the CPU and address decoding if you look at the 68K it shows pin 17 as _HLT, at the other end of the circuit trace you see _HLT mentioned again next to a Bi - Directional symbol which looks a bit like a diamond on its side, just to the right of this is the number 4.

My question is - what does that 4 mean, I thought it might be a page reference but page 4 of the schematics does not contain a _HLT signal.
It might be that its referencing a particular bus or state machine state but I have no way of knowing.

Information on what this means would be appreciated.
Cheers In Advance.

I have added a picture maybe this will help get some answers.

06 July 2012, 16:19	#1
Brass Zone Friend Join Date: Sep 2006 Location: New Zealand Posts: 55	B2000 Schematics Question Hi Everyone, I have the B2000 schematics which I have no problems reading ; however there is something on the schematics which I have never seen before as an example looking on the first page of the schematics which has the CPU and address decoding if you look at the 68K it shows pin 17 as _HLT, at the other end of the circuit trace you see _HLT mentioned again next to a Bi - Directional symbol which looks a bit like a diamond on its side, just to the right of this is the number 4. My question is - what does that 4 mean, I thought it might be a page reference but page 4 of the schematics does not contain a _HLT signal. It might be that its referencing a particular bus or state machine state but I have no way of knowing. Information on what this means would be appreciated. Cheers In Advance. I have added a picture maybe this will help get some answers. Attached Thumbnails Last edited by Brass; 16 July 2012 at 17:19. Reason: Adding a picture

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