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Tandy 1400LT XT-CF-Lite-LAN Opensource.

T

Theoryboy

Member
Joined
Sep 13, 2020
Messages
42
Location
Ireland
Hi all,

Heavily inspired by the lo-tech.co.uk TANDY 1400 card, I made another TANDY 1400 card, tested on my 1400LT.

It adds HD storage through the XT-CF-Lite , and integrated Realtek 8019AS ne2000 LAN. I really wanted to add audio but with the 200mA limit I stopped with the LAN and XTIDE.
My Tandy 1400LT has a Phoenix ROM BIOS version 2.51.70 , both floppies work and soft boot also works with the card. I think this is to do with improvements to XUB rather than anything I did.

All KiCAD file and gerbers :
https://github.com/retrotheory/tandy-XT-CF-Lite-LAN

It can be seen working here
https://youtu.be/shpWmdpa19w?t=177
 

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Theoryboy said:
Hi all,

Heavily inspired by the lo-tech.co.uk TANDY 1400 card, I made another TANDY 1400 card, tested on my 1400LT.

It adds HD storage through the XT-CF-Lite , and integrated Realtek 8019AS ne2000 LAN. I really wanted to add audio but with the 200mA limit I stopped with the LAN and XTIDE.
My Tandy 1400LT has a Phoenix ROM BIOS version 2.51.70 , both floppies work and soft boot also works with the card. I think this is to do with improvements to XUB rather than anything I did.

All KiCAD file and gerbers :
https://github.com/retrotheory/tandy-XT-CF-Lite-LAN

It can be seen working here
Click to expand...
Hello,

I'm working on building you card. Can I ask a question? What are the values of C9-C14? The schematics, silkscreen, and BOM don't specify the capacitance. Also, what are the voltages for the other caps? Only C21 shows a voltage.

Thanks!
 
elite4god said:
Hello,

I'm working on building you card. Can I ask a question? What are the values of C9-C14? The schematics, silkscreen, and BOM don't specify the capacitance. Also, what are the voltages for the other caps? Only C21 shows a voltage.

Thanks!
Click to expand...
Apologies,

C11,C12 20pF 50V

C9,C10, C13,C14 1nF 50V
 
modem7 said:
I suspect that elite4god does not understand "200R", and wants to hear something like "200 ohms".
Click to expand...
modem7 is correct. Though I've done some reading and it seems 200R = 200 ohms. I've also found some reference designs for this RTL chip and the resistor in these is 200 ohms.

Thanks for all the help.
 
elite4god said:
modem7 is correct. Though I've done some reading and it seems 200R = 200 ohms. I've also found some reference designs for this RTL chip and the resistor in these is 200 ohms.

Thanks for all the help.
Click to expand...
Great , sorry for confusion.
 
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