VOGONS


Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Topic actions

First post, by matze79

User metadata
Rank l33t
Rank
l33t

Tandy 3 Voice Soundkarte has finished now,

photo_2020-09-25_11-02-11.jpg
Filename
photo_2020-09-25_11-02-11.jpg
File size
100.92 KiB
Views
5129 views
File license
Fair use/fair dealing exception
photo_2020-09-25_10-52-30.jpg
Filename
photo_2020-09-25_10-52-30.jpg
File size
345.84 KiB
Views
5129 views
File license
Fair use/fair dealing exception

http://www.retroianer.de - Project Page

Tandy Sound Patches:
ftp://ftp.oldskool.org/pub/TandySoundPatches/
http://nerdlypleasures.blogspot.com/2015/08/p … sound-card.html
(Note you need to Unpack prince.exe first!)

Old Silencing Utility:
http://www.retroianer.de/SNDOFF.EXE

3Tool:
https://www.retroianer.de/wordpress/index.php … ndy-soundkarte/

VGM Player (SBVGM) :
Re: SBVGM (DOS) VGM Player

Tandy Tracker:
ENG: Re: TNDY Tracker - For Tandy 1000 / Tandy 3 Voice ISA Cards / Tandy / TNDLPT Parallelport Devices

Port Redirection Driver:
https://github.com/JKnipperts/TNDY
(Does use Protect Mode without EMM/QEMM , incompatible with Smartdrv/Memory Managers)

Lo-Tech Driver (pdewacht)
https://github.com/pdewacht/lotech
(Works only with QEMM386, but code from TNDLPT should be ported back to Support EMM386)

OLD Text - Obsolete:
Hi,

i wanted to build a lotech Tandy Soundboard, unfortunaly James is not longer selling any boards on his page.
Does anyone own a Spare Board and can Scan both Sides in High Resolution to allow me to build my own ?
EDIT: I'm a idiot.. james already has pictures in high res on his side.
EDIT: Ok backside is missing... 😒
i have already all components laying around.. just missing the pcbs.

should not a hard task to reengineer the pcb.

Maybe someone can help me out ?
i can also trade i still have lotech isa compactflash pcbs.
and rs232 to ps/2 converter pcbs.

Thanks

Matthias

EDIT:
Hotfixes for LO-Tech Audio Combatible Sound Adapter and R0 and R1 Tandy 3 Voice Boards:

Tandy 3 Voice Sound - SN76489 ISA Soundcard Project

Last edited by matze79 on 2023-05-17, 22:00. Edited 10 times in total.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 1 of 454, by sirlemonhead

User metadata
Rank Member
Rank
Member

Did you contact him? I noticed he's not selling anything at the moment but did he say he's stopped altogether?

Thought he might be receptive to release schematics/files if he's no longer interested in selling PCBs...

Reply 2 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

yes already did contact him, does not answer anymore.

i found a old schematic.

Tandy-Sound-Adapter-r01.png
Filename
Tandy-Sound-Adapter-r01.png
File size
60.24 KiB
Views
9948 views
File license
Fair use/fair dealing exception

but i dont know if its the same version like the pcb from the store.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 3 of 454, by matze79

User metadata
Rank l33t
Rank
l33t
tandy.jpg
Filename
tandy.jpg
File size
154.97 KiB
Views
9857 views
File license
Fair use/fair dealing exception

During my holidays i made some progress..
maybe soon i etch a pcb.

still need to check adress decoder, i'm never have designed one... and have no exact idea how they work.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 4 of 454, by dreamblaster

User metadata
Rank Oldbie
Rank
Oldbie

nice !
if you need some help, just pm me

Visit http://www.serdashop.com for retro sound cards, video converters, ...
DreamBlaster X2, S2, S2P, HDD Clicker, ... many projects !
New X2GS SE & X16GS sound card : https://www.serdashop.com/X2GS-SE ,
Thanks for your support !

Reply 5 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

Thanks 😀

test.jpg
Filename
test.jpg
File size
111.39 KiB
Views
9821 views
File license
Fair use/fair dealing exception

found some spare time.. need a break now 😁

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 6 of 454, by bjt

User metadata
Rank Oldbie
Rank
Oldbie

I have a populated (not working) Lotech Tandy board if it would help you.

Didn't spend too much time troubleshooting it because I have another working board.
You can have it for the price of postage. I suspect it might have a bad via.

Reply 7 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

Thanks i send you a PM, that would really help me 😀

i'm testing some stuff with the Soundchip and a AVR currently (muting noise)
The MCU is only 50 Cent, also why not use one.
Programming is also no problem at all. Just adding a ISP Header.
And a ISP Adapter is today 1-2$ delivered from HK/CN.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 8 of 454, by bjwil1991

User metadata
Rank l33t
Rank
l33t
bjt wrote:

I have a populated (not working) Lotech Tandy board if it would help you.

Didn't spend too much time troubleshooting it because I have another working board.
You can have it for the price of postage. I suspect it might have a bad via.

I purchased one last year on eBay, and it sounds amazing. Guessing you got one on eBay yourself?

Discord: https://discord.gg/U5dJw7x
Systems from the Compaq Portable 1 to Ryzen 9 5950X
Twitch: https://twitch.tv/retropcuser

Reply 9 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

the Schematic above is really outdated, and CE never does anything with that Decoder at C0h.

I redraw something from the Pictures, James seems to use Top Plane as VCC.
As Capacitor on the Image has + connected in the top layer.

tandy_decoder.png
Filename
tandy_decoder.png
File size
28.52 KiB
Views
9710 views
File license
Fair use/fair dealing exception

i used the images from lotech cards i found on the net and draw this..
Maybe some one with a Card can confirm it.

My Clock Divider is working fine and also my Tandy Chip is connected right.
The Picture of the ISA Card (Perfboard) is wrong rewired it.

So the only remaining thing is the decoder 😀

And here my LanCable WireMess:

messcard.jpg
Filename
messcard.jpg
File size
115.1 KiB
Views
9709 views
File license
Fair use/fair dealing exception

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 10 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

Adress Decoder is working now, Card is playing Sounds 😀

Thanks to everyone helped.

Now i have 2 working Boards.

Now its time to get the Noise on Power up fixed 😁

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 11 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

Here a Picture of the working Card:

DSC_0099 (Large).JPG
Filename
DSC_0099 (Large).JPG
File size
476.42 KiB
Views
9586 views
File license
Fair use/fair dealing exception

i working now on getting the Sound IC muted on Boot Up 😀

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 12 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

breadboard test for muting 76489 successful.

Added 74HC244 to the perfboard build, allowing me to cut the 76489 from isa bus to send commands with mcu.
Had some issues, but turning down Busspeed to 4.77Mhz fixed them 😀

test1.jpg
Filename
test1.jpg
File size
145.14 KiB
Views
9564 views
File license
Fair use/fair dealing exception

Tomorrow is MCU Time 😁

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 14 of 454, by matze79

User metadata
Rank l33t
Rank
l33t
mcu_tech.jpg
Filename
mcu_tech.jpg
File size
152.91 KiB
Views
9510 views
File license
Fair use/fair dealing exception

MCU is wired up.

Now its time to get a Idea howto get it work..

Need still to cut off some signals (CE/IOW/etc)

Pass them Trough MCU ? hmm

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 15 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

With MCU passthrough i get timing issues, even if i do use asm hmm.
And another Amp or Transistors to switch off would raise the part count up..

EDIT:
Stupid Idea, content removed.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 16 of 454, by matze79

User metadata
Rank l33t
Rank
l33t
muting_Ready.jpg
Filename
muting_Ready.jpg
File size
106.6 KiB
Views
9408 views
File license
Fair use/fair dealing exception
photo_2018-03-03_14-26-05.jpg
Filename
photo_2018-03-03_14-26-05.jpg
File size
133.39 KiB
Views
9408 views
File license
Fair use/fair dealing exception

Got it!

Muting now works.
The Card is now silent on Bootup.

A RS Flip FLop did not work well for me.
Some BIOS seem to access second DMA Controller, so running the Card on AT (0C0h) can cause the Flip Flop to Trigger on Boot..

I'm using a ATTiny13 now.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board

Reply 18 of 454, by dreamblaster

User metadata
Rank Oldbie
Rank
Oldbie

Super news !

Visit http://www.serdashop.com for retro sound cards, video converters, ...
DreamBlaster X2, S2, S2P, HDD Clicker, ... many projects !
New X2GS SE & X16GS sound card : https://www.serdashop.com/X2GS-SE ,
Thanks for your support !

Reply 19 of 454, by matze79

User metadata
Rank l33t
Rank
l33t

Current Progress:

tandy_check.jpg
Filename
tandy_check.jpg
File size
123.37 KiB
Views
9287 views
File license
Fair use/fair dealing exception

Now i'm Searching a way to reset attiny on System Reset.

https://www.retrokits.de - blog, retro projects, hdd clicker, diy soundcards etc
https://www.retroianer.de - german retro computer board