16 replies to this topic

[KubaCZ]

I've got some free time so I've decided to build covox using schematics on Lotharek's website:

Problem is that I can't find 74LS574, only 74HC(T)574... they look like they're same but maybe not? Also, can I just connect L + R output to stereo Pokey output or it needs to be seperated from it?

[BillC]

KubaCZ, on Mon Feb 6, 2012 12:51 PM, said:

I've got some free time so I've decided to build covox using schematics on Lotharek's website:

Problem is that I can't find 74LS574, only 74HC(T)574... they look like they're same but maybe not? Also, can I just connect L + R output to stereo Pokey output or it needs to be seperated from it?

Futurelec lists the 74LS574 for $1.25, I don't have any personal experience with them.

[candle]

you can simply use hct

[ivop]

HCT will probably even sound better as the signal transitions will be faster and synchronous. Think going from 127 to 128 where seven bits go from 1 to 0 and one bit goes vice versa. In CMOS technology, both transitions are equally fast. In NMOS technology, going from 1 to 0 is faster than the other way around, hence there will be a short value of zero in between 127 and 128.

As for mixing with pokey signals, a simple passive mixer will do, for example, route them through a 4k7 resistor and tie them together. If you use a 10k pot and use the wiper as output, you can adjust the balance as you see fit.

[KubaCZ]

Ok, thanks... tommorow I'll post results

[KubaCZ]

It works!

I didn't use 2k4 resistors but instead I used 820r, 1k6 ,3k3, 6k2, 12k, 24k, 47k and 91k. It sounds good in Inertia, but in Neotracker it's total mess.. adress is $D280, right?

[KubaCZ]

Oh, it's not on $D280 but on $D600... so now work both of them

It's funny how it sounds better than LPT dac's on 386-P1 computers.

[Mathy]

Hello KubaCZ

$D280 would be better. All PBI devices use $D600. Luckily with VBXE we have a choice between $D600 and $D700.

Mathy

[KubaCZ]

Mathy, on Tue Feb 7, 2012 4:11 PM, said:

Hello KubaCZ

$D280 would be better. All PBI devices use $D600. Luckily with VBXE we have a choice between $D600 and $D700.

Mathy

Hi Mathy

problem is that Inertia has D600 hardcoded I think and I want to have it working too... I'm using IDE+2 which is PBI and doesn't have any problem with it... only it makes noise when loading data but that's not big problem

[Mathy]

Hello KubaCZ

"Hardcoded" doesn't mean that much anymore. There should be more them enough people here that can change $D600 into $D280.

Mathy

[Fox-1 / mnx]

Inertia Player 4.0 can be set manually to $D5, $D6 and $D7

[Stephen]

Fox-1 / mnx, on Tue Feb 7, 2012 8:31 PM, said:

Inertia Player 4.0 can be set manually to $D5, $D6 and $D7

Is there a way to get Inertia ( I think I have 4.5) to work with a Covox wired to $D280?

[Fox-1 / mnx]

Stephen, on Tue Feb 7, 2012 8:46 PM, said:

Is there a way to get Inertia ( I think I have 4.5) to work with a Covox wired to $D280?

Possibly. May be as easy as altering the code with a sector editor (changing 80D2 to 00d6) but never looked into the code.

[Stephen]

Fox-1 / mnx, on Tue Feb 7, 2012 8:58 PM, said:

Stephen, on Tue Feb 7, 2012 8:46 PM, said:

Is there a way to get Inertia ( I think I have 4.5) to work with a Covox wired to $D280?

Possibly. May be as easy as altering the code with a sector editor (changing 80D2 to 00d6) but never looked into the code.

K - I'll try that.

[Fox-1 / mnx]

It's actually reversed. You need search for 00D6 ($D600) and change it to 80D2 ($D280) but I guess you'll get the point :-)

[Mathy]

Hello guys

IIRC there were/are two versions of Inertia. Where the version with the lower version number was actually the latest version, or the version with more options.

Mathy

[CharlieChaplin]

Well,

there were half a dozen or more versions of Inertia, alas, I have only three of them (versions 2.x, 3.x and 4.5). Attached them here, as well as some other Covox software, like Pro-Tracker and Neo-Tracker (v1.6 on ATR, v1.7 and v1.8 as XEX)

-Andreas Koch.

Attached Files

•  covox.zip   210.39K   18 downloads