ISA serial cards w/ 16-bit header in 8-bit slot \ VOGONS

ISA serial cards w/ 16-bit header in 8-bit slot

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First post, by blakespot

Posted on 2018-12-30, 22:49

blakespot Offline

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I’m looking to add a dual 16550-based ISA serial board to a Tandy with 8-bit ISA slots. What are the odds that these will do dual duty and work fine on a 8-bit slot PC?

https://www.amazon.com/StarTech-com-RS232-Ser … ort+16550&psc=1

There are 4 leads on the 16 bit extender. Will this work for me?

Thanks.

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Reply 1 of 5, by Matth79

Posted on 2018-12-30, 23:44

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Looking at the allocations, I think they are for the high IRQ lines, so it may work with that part hanging or cut off.

Do you need two ports, this single port is way less expensive
https://www.amazon.com/SIIG-1Ser-16550-Speed- … l/dp/B00004Z66M

Reply 2 of 5, by canthearu

Posted on 2018-12-31, 01:08

canthearu Offline

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As long as you are using IRQs 3,4 or 5, I presume it would work fine in an 8 bit slot.

Reply 3 of 5, by dionb

Posted on 2018-12-31, 01:19

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Not sure where you are located, but I have piles of 8b I/O cards I'd happily donate (if you cover shipping from NL) to anyone actually willing to use them. PM me if interested 😉

Reply 4 of 5, by blakespot

Posted on 2018-12-31, 02:48

blakespot Offline

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Matth79 wrote:
Looking at the allocations, I think they are for the high IRQ lines, so it may work with that part hanging or cut off.

Do you need two ports, this single port is way less expensive
https://www.amazon.com/SIIG-1Ser-16550-Speed- … l/dp/B00004Z66M

I do need two lines. Mouse and WiFi modem. I ordered this. Sounds like it will work fine. Thanks.

:: Visit the Byte Cellar, my vintage computer blog (since 2004).
:: See a panorama of my own Byte Cellar (a.k.a. basement computer room)...
:: twitter: @blakespot

Reply 5 of 5, by CODOR

Posted on 2019-01-05, 19:22

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I have the Startech card and can confirm both ports work (using standard IRQs 4&3) in a Tandy 1000SX.

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