How to install header pins properly

[Gareth Bransby]

Hi all, I'm assembling my RC2014 Pro. Check out the pic below, what am I doing wrong with the header pins ? Am I supposed to use the double row header for the full length and pull out the pins that aren't used ?

[Duncan Munro]

Hi Gareth,

There's a guide here which I found very helpful when putting the double row pin headers on my cards -> http://rc2014.co.uk/1426/preparing-enhanced-bus-connectors/

But yes, you run the double header all the way along and pull out the pins you don't need. The guide talks through all of that in detail so should get you to where you need to be.

Regards,

Duncan

On Sat, 27 Feb 2021 at 12:08, Gareth Bransby <gareth...@gmail.com> wrote:

Hi all, I'm assembling my RC2014 Pro. Check out the pic below, what am I doing wrong with the header pins ? Am I supposed to use the double row header for the full length and pull out the pins that aren't used ?

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Duncan Munro
www.duncanamps.com

[Gareth Bransby]

That's perfect, thanks. I've been looking at some of the other pictures of the boards on the RC2014 site. Not all of the boards have the pins for the enhanced bus populated, although there are holes and silkscreen there. Is it ok to just go ahead and populate all of the pins for both buses ? I want to run CPM eventually.

For example, in the picture showing all of the boards for the Pro kit, the RAM board has all of the bus pins in place. In the picture of the same board here : https://rc2014.co.uk/modules/64k-ram/ the enhanced bus is not populated.

I've also noticed that very few of the pins on the enhanced bus connectors on the daughter boards connect to anything. I'm wondering why they're there. Unless these are 4 layer boards and I can't see the traces?

[Fredrik Axtelius]

Why are the resistors standing up? Didn't they fit flat down on the PCB?

--Fredrik

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[Gareth Bransby]

I thought the holes were too close together for the resistors to lay flat but I just wasn't bending them close enough to the body. I've re-done them and they're flat now.

[Spencer Owen]

On Sat, 27 Feb 2021 at 12:40, Gareth Bransby <gareth...@gmail.com> wrote:

For example, in the picture showing all of the boards for the Pro kit, the RAM board has all of the bus pins in place. In the picture of the same board here : https://rc2014.co.uk/modules/64k-ram/ the enhanced bus is not populated.

I've also noticed that very few of the pins on the enhanced bus connectors on the daughter boards connect to anything. I'm wondering why they're there. Unless these are 4 layer boards and I can't see the traces?

Hi Gareth,

Just to clarify, that yes, for a RC2014 Pro, to run CP/M, double row headers should be fitted, and the right amount of each should have been supplied with the kit.  Thanks Duncan for linking to the guide on that.

You're right that they are 2 layer boards, and not many pins of the Enhanced Bus connector are used.  Most will work fine but possibly with some restrictions with a single row header.  For example;

• The Dual Clock Module and the Dual Serial Module both use the Clock 2 pin, so that a different speed can be set for Port B.  However, if you don't use Port B, or you run it at the same speed as Port A, then you can just use the link on the Dual Serial Module.  (The Port B Tx and Rx signals are also bought out to the end of the bus too)
• The CPU Module has the Buasck, Halt, Busrq, Wait and NMI pins bought out to the header - however, none of these are used in a default build of the RC2014.  There are some other modules that use some of these signals, so they are there for if and when you need them.
• The Pageable ROM and the 64k RAM Module both use the Page pin in order to run CP/M.  This pin is set when the ROM pages itself out and tells the RAM module to page in the lower 32k RAM.  These modules were designed before the Backplane Pro, so originally just had a single jumper wire going between them when used with the Backplane 8.  If they are being used for BASIC or SCM, then the Page pin isn't used at all.

Hope that helps

Spencer