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Tandy Nano - 3 Voice Soundcard ISA - Lowprofile

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Reply 80 of 90, by ElBrunzy

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while we are at it, here is a cable I did yesterday to chain my second tndy nano to an ews64xl for my basement setup :

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Now I need to put the sticker on that computer case

Reply 81 of 90, by ElBrunzy

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matze79 wrote on 2020-11-28, 12:42:
Here is my Card installed in my 486: […]
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Here is my Card installed in my 486:

photo_2020-11-28_13-40-20.jpgphoto_2020-11-28_13-40-33.jpg

A Speaker + a 3 Pol Switch.

The Switch is used to Switch from 2C0h to 0c0h when i play Tandy Games.
And back to 2c0h for conflict free Operation afterwards.

I never realized the line-out amplifier of your tndy nano was so powerful it could drive that kind of speaker....

Reply 82 of 90, by matze79

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Don`t connect it to a Line In, only PCSPK in.

Its same Amplifer like Tandy uses, LM386.

https://dosreloaded.de - The German Retro DOS PC Community
https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 83 of 90, by ElBrunzy

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matze79 wrote on 2020-12-06, 10:08:

Don`t connect it to a Line In, only PCSPK in.

Its same Amplifer like Tandy uses, LM386.

Wow, good advice ! Great thing I read that before I tested my setup. Although I'm pretty sure speaker-out is safe for line-in. My first tndy nano was connected to an awe32 spk-in. But this second one I intend to plug on ews64xl line-in. I'm not sure it support spk-in. Maybe I should lower the adjustable volume level potentiometer ? I left it at mid level.

EDIT : On secound thought... when you say "speaker-out" I assume you mean "pc-speaker-out" ? Maybe I can bypass that LM386 and feed the EWS64XL the LM386 input signal directly to the line-in of the EWS64XL ?

Reply 84 of 90, by matze79

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yes but if you bypass LM386 muting does no longer work, as LM386 ByPass Pin is pulled to GND to stop amplifer from working until ChipEnable is issued.
The MCU is also needed to survive bios scanning of lower port range without unlocking the Amplifier, as it introduces a delay of a few ms to allow SYSTEM POST accessing Devices.
This is specially useful on AT+ System as BIOS will access DMA Controller and unlock a Card on 0C0h making the muting Circuit useless.

I would connect it to PC-Speaker Input of the Soundcard or add a Second PC-Speaker to the Case.

I still hope we get that Serdashop Thing running, but due to current circumstances (corona shit and other delays) the slot cover still is not ready.

https://dosreloaded.de - The German Retro DOS PC Community
https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 85 of 90, by ElBrunzy

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your card worked perfectly on ews64l on any position. I left the SMD variable transistor in the middle. I could not keep it though as it was too noisy. I doubt the 1.1 is any less. I plugged the SN76489 with two SAA1099 on a switched EQ so I can have both.

Reply 86 of 90, by theoryboy

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Thanks for making this card, I made a little 2 slot ISA riser for my IBM PS1 2011 and it works fine. A few issues when not initialised , and the TSR wont run on the the IBM but games that support the Tandy sound work .

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Reply 87 of 90, by matze79

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Nice you like it,

https://github.com/matze79/Tandy-Nano

Now OpenSource.

https://dosreloaded.de - The German Retro DOS PC Community
https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer