Sorry if this is a silly question - I have Exxos' 1.44MB drive and TOS upgrades to install, and I'm not sure which side of the machine pin headers should face the ST motherboard versus the PCB. If you look at the attached image, there's a flattened side and one with a 'bump' on each pin - I'm reasonably sure the flattened side should face the motherboard, but I also think I've seen them both ways. Can anyone help?
Machined pin header orientation
Re: Machined pin header orientation
I would use the thiner pins (bumpy, conical side) on the motherboard, because they would slide more easily for installing/desinstalling.
The bolder pins (flatened, cylindrical side) would slide less easily (e.g. 0.6 is the default diameter for via in kicad IIRC), so would have a better grip on the extension PCB.
EDIT : that said, I have never used them yet, let's wait for the answers of experienced peoples
The bolder pins (flatened, cylindrical side) would slide less easily (e.g. 0.6 is the default diameter for via in kicad IIRC), so would have a better grip on the extension PCB.
EDIT : that said, I have never used them yet, let's wait for the answers of experienced peoples
- rubber_jonnie
- Site Admin
- Posts: 10473
- Joined: Thu Aug 17, 2017 7:40 pm
- Location: Essex
- Contact:
Re: Machined pin header orientation
On my own TOS switcher I placed the flat side to the switcher PCB and the conical side to the mainboard, much as @sporniket described.
If you ever need to use machined pin sockets, there is a conical depression in the socket side so the pins go as far in as possible and the conical faces mate.
If you ever need to use machined pin sockets, there is a conical depression in the socket side so the pins go as far in as possible and the conical faces mate.
Collector of many retro things!
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
800XL and 65XE both with Ultimate1MB,VBXL/XE & PokeyMax, SIDE3, SDrive Max, 2x 1010 cassette, 2x 1050 one with Happy mod, 3x 2600 Jr, 7800 and Lynx II
Approx 20 STs, including a 520 STM, 520 STFMs, 3x Mega ST, MSTE & 2x 32 Mhz boosted STEs
Plus the rest, totalling around 50 machines including a QL, 3x BBC Model B, Electron, Spectrums, ZX81 etc...
Re: Machined pin header orientation
Thicker / shorter pins go in the PCB. Thinner / longer ends in the motherboard.
Because firstly the thinner ends will fit inside socket headers better (If they actually get used that is). While the thicker pins "do" fit in the header sockets, they actually widen the holes and they will no longer fit in the thinner pins.
Also should you need to remove the board, the thinner pins will come out of the motherboard a lot easier than the thicker side of pins.
Because firstly the thinner ends will fit inside socket headers better (If they actually get used that is). While the thicker pins "do" fit in the header sockets, they actually widen the holes and they will no longer fit in the thinner pins.
Also should you need to remove the board, the thinner pins will come out of the motherboard a lot easier than the thicker side of pins.
https://www.exxosforum.co.uk/atari/ All my hardware guides - mods - games - STOS
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.
https://www.exxosforum.co.uk/atari/store2/ - All my hardware mods for sale - Please help support by making a purchase.
viewtopic.php?f=17&t=1585 Have you done the Mandatory Fixes ?
Just because a lot of people agree on something, doesn't make it a fact. ~exxos ~
People should find solutions to problems, not find problems with solutions.