VOGONS


Reply 160 of 390, by Tiido

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Or you could clock another 74 by write (or two) to the PSG that then ungates the clock, no need for an extra MCU. Reset of that 74 would be controlled by ISA reset or a simple RC time constant.

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 161 of 390, by matze79

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Yeah but DTK Floppy BIOS and other Option Rom`s seem to access the Port Adress of PSG and activate it.
Also EPSON IM BIOS trys to access 0C0.
So i needed a more flexible solution.
I tried with a flip flop before which worked fine on 2c0 but never on 0c0.

And ISA Reset is only active on hard reset, but not within a soft reset (STRG+ALT+DEL)
I already use it to retrigger the MCU.

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Co2 - for a endless Summer

Reply 162 of 390, by Tiido

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Aha ok, so MCU will be only foolproof solution.

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 163 of 390, by matze79

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Found a new issue, when i cut the clock off from sn76489 - floppy bios hangs until the clock is attached back to sn76489
then it continues to boot.
This is only a issue on AT Computers. As 0C0 is unsupported because Second DMA Controller is using this Address.
Using 1E0 or 2C0h this is no issue at all.

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Co2 - for a endless Summer

Reply 164 of 390, by Tiido

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You have to gate the Ready signal too then, it is controlled by the clock and will cause infinite bus cycle if there's no clock.

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 165 of 390, by matze79

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it must be something else, if i bend the ready pin up, it also occurs.
no time anymore 🙁 for further investigations.
Tomorrow work.. so i have to wait until sunday.

EDIT:
deleted.

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Co2 - for a endless Summer

Reply 166 of 390, by matze79

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Thanks again 😀
that did the Job, the SN76489 was defective i replaced it and now it works by gating clock and ready.

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https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 167 of 390, by Tiido

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That's good news ~

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 168 of 390, by matze79

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only gating the two brings problems 😒
i need to fully cut the sn76489 from bus then.

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

Co2 - for a endless Summer

Reply 169 of 390, by Tiido

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That makes no sense, there's no read function on the chip that I know of, the inputs are all actual inputs according to silicon shots...

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 170 of 390, by matze79

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yeah i know that, also does make no sense to me. i need to hookup my oscilloscope to see whats happening here..
everything is wired correctly, i triple checked it.

EDIT:
simple things may prevent from success..
just add the damn capacitor 😉

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Co2 - for a endless Summer

Reply 171 of 390, by matze79

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So finally i got it working, was bit challenging,
a pull up is required on SN76489.

i also did not add a capacitor which caused various symptoms,
i thought for a short test it will suffice.
Also breadboard has loose contacts, i throw it away..

i had a real huge series of mistake.
so i throw all away and started over again.

Damn it works ! 😀

Not bad for a Bakermen 😉

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https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 172 of 390, by dreamblaster

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matze79 wrote:
So finally i got it working, was bit challenging, a pull up is required on SN76489. […]
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So finally i got it working, was bit challenging,
a pull up is required on SN76489.

i also did not add a capacitor which caused various symptoms,
i thought for a short test it will suffice.
Also breadboard has loose contacts, i throw it away..

i had a real huge series of mistake.
so i throw all away and started over again.

Damn it works ! 😀

Not bad for a Bakermen 😉

Great news, congratulations ! 😀

Visit http://www.serdashop.com for retro sound cards, video converters, ...
OPL2LPT, OPL3LPT, X2, S2, S2P, MCE2VGA, ... many projects !
Special vogons LPT bundle : https://www.serdashop.com/Parallel-port-retro-sound-bundle
Thanks for your support !

Reply 173 of 390, by root42

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matze79 wrote:

Not bad for a Bakermen 😉

Hmmm…

https://youtu.be/ymdssZOAx3Q

YouTube and Bonus
80386DX@25 MHz, 8 MiB RAM, Tseng ET4000 1 MiB, SnarkBarker & BlasterBoard, PC MIDI Card + SC55 + MT32, XT CF Lite, OSSC

Reply 174 of 390, by matze79

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all is tested, i rerouted changes and order pcb 😀

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Co2 - for a endless Summer

Reply 175 of 390, by Tiido

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Oho, a proper prototype ! Very nice ~

T-04YBSC, a new YMF71x based sound card & Official VOGONS thread about it
Newly made 4MB 60ns 30pin SIMMs ~
mida sa loed ? nagunii aru ei saa 😜

Reply 176 of 390, by matze79

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Yeah its better to verify every change to ensure it will work as i wanted 😀

Current progress:

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silkscreens needs some clean up.
LM386 needs to be turned to match other ICs.

i`m testing Decoder for 0x205 now.
for IBM PS/1 3 Voice Support.

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https://www.retroianer.de - under constructing since ever

Co2 - for a endless Summer

Reply 177 of 390, by matze79

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Good news, got next boards, now i verify all changes 😀

Then we go one Stop further.
Bracklets!

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Co2 - for a endless Summer

Reply 178 of 390, by matze79

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New Driver for Port Redirection without need of QEMM386 or EMM386 is in development.

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https://dosreloaded.de - The German Retro DOS PC Community
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Co2 - for a endless Summer

Reply 179 of 390, by dreamblaster

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matze79 wrote:

New Driver for Port Redirection without need of QEMM386 or EMM386 is in development.

Nice !

Visit http://www.serdashop.com for retro sound cards, video converters, ...
OPL2LPT, OPL3LPT, X2, S2, S2P, MCE2VGA, ... many projects !
Special vogons LPT bundle : https://www.serdashop.com/Parallel-port-retro-sound-bundle
Thanks for your support !