Parallel Port Cards (on the cheap!)

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28 Dec 2023 02:45 #289217 by tommylight
Replied by tommylight on topic Parallel Port Cards (on the cheap!)
Last link from aliexpress should work, it has the big MOS chip and has no serial chips ( i did have the same with serials and it is still in use daily, for over 7 years or more).
Again, no guaranties, but it should just work, no drivers needed.

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28 Dec 2023 02:46 #289218 by cornholio
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Which cards are they ?

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28 Dec 2023 02:50 #289220 by tommylight
Replied by tommylight on topic Parallel Port Cards (on the cheap!)
Asking me or ???
I still have some in the shop, can take pictures and post them here, must be 2 or more...

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28 Dec 2023 03:24 #289224 by cornholio
Replied by cornholio on topic Parallel Port Cards (on the cheap!)
Sorry Tommy, was inquiring if rod has any examples of parallel port cards that are emulated serial cards.
Which seems a bit odd that you'd write an 8 bit value to port , the chip converts it to serial sends it through the chip and then converts it back again to parallel at a IO port.

I know a lot of cards netmos included that use the parport_serial driver, but that seems to probe & setup the card for the parallel port to become available.

I have a few of those and haven't seen any issue with them.
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28 Dec 2023 03:46 #289225 by tommylight
Replied by tommylight on topic Parallel Port Cards (on the cheap!)
PCI-E is serial comms, so ....
Never used PCI-E to parallel cards, so no idea, but i would think those have issues as it is serial to parallel and need drivers to convert stuff, but some have been reported here to work and some did not work at all, even with supplied drivers.
In general, software emulated cards do not work at all, like usb to parallel, some PCI and PCI-E with a very small chip (usually come with a small CD).
LinuxCNC needs full hardware access to parallel port to work.

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28 Dec 2023 04:24 #289227 by cornholio
Replied by cornholio on topic Parallel Port Cards (on the cheap!)
Yeah ok granted PCIe is serial comms, little bit higher frequency than your standard serial port.

PCIe parallel port cards are fine. Tested a few of them no issues, sometimes getting the base address is a gamble....and if you move them to a different physical slot they can end up with a different base address.

Motherboard based ports are still the least pain free.......they still exist just need a keen eye and willing to search or go for a dell\hp\or lenovo cos sometimes you'll get lucky.......but then they throw a birck in the work and need the "magic cable" to plug into the MB header, some trickery with the gpio on the "super chip".
In theory if the LPC bus is exposed via a TPM module you could connect a LPC super chip but you would need some process to make it ALIVE. This has been done to get an ISA connector for old sound cards on modern systems, mainly for DOS games.
www.vogons.org/viewtopic.php?t=93291
Same thing on another site that will not be named hackaday.com/2023/03/23/isa-over-tpm-to-your-pc/
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28 Dec 2023 19:36 #289276 by tommylight
Replied by tommylight on topic Parallel Port Cards (on the cheap!)

Tested a few of them no issues, sometimes getting the base address is a gamble....and if you move them to a different physical slot they can end up with a different base address.

Same goes for PCI if the BIOS is set to assign resources automatically, it would change port address, but rarely happened in normal use.

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01 Jan 2024 19:06 #289497 by steveinjava
Replied by steveinjava on topic Parallel Port Cards (on the cheap!)
rodw, thanks for all your opinions. If I should avoid a card with serial and parallel on the same card- what should I be looking for? I understand I need a parallel port...
Anyway, I have now ordered the following (The other moschip one disappeared!)
www.aliexpress.com/item/1005005573599372.html
I will take my chance at under a tenner :)

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01 Jan 2024 19:13 #289498 by steveinjava
Replied by steveinjava on topic Parallel Port Cards (on the cheap!)
I should say the chip inside is the moschip AX99100 which seems to be up to the job. It has SPI and most features I understand but do not know if linuxcnc uses...
Thanks again and I will no doubt be back to bother you all when it arrives and I can't get any joy! Happy new year to all.

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08 Jan 2024 07:18 #290187 by itsemast
Replied by itsemast on topic Parallel Port Cards (on the cheap!)
AX99100 in SPI mode sounds interesting if used together with Remora or RIO. I think there was a port of the component from bcm2835 specific library to a more generic spidev, which is implemented in this driver: github.com/daveriesz/ax99100

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