Search found 732 matches

by HardWareMan
Thu Jun 29, 2017 11:41 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

I forgot control channel. Here is power up: http://savepic.ru/14634000m.png Little bit closer at reset: http://savepic.ru/14614544.png http://savepic.ru/14634003m.png http://savepic.ru/14662674m.png Shortest nIRQ period is 6.334 ms. http://savepic.ru/14674965m.png The rest periods seems to be multip...
by HardWareMan
Thu Jun 29, 2017 10:34 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

Same here (no audio disk -> audio disk load -> audio disc play): http://savepic.ru/14651418m.png A little bit closer while playing: http://savepic.ru/14623744m.png SCOR period: 1/75 sec. SCOR pulse is right one WFCK clock period. EXCK/SBSO active only when WFCK is low and they push only 8 bits at on...
by HardWareMan
Thu Jun 29, 2017 10:11 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

First approach: http://savepic.ru/14642189.png BCLK = 16MHz / 8. Yes, audio bit clock is 2.1168MHz (16.9344 / 8). 2 116 800 Hz / 48 = 44 100 Hz. Audio CD loading and then playback it: http://savepic.ru/14635020m.png Note that some data is break thru to the DAC, but Mute not allow them to output. I t...
by HardWareMan
Thu Jun 29, 2017 9:19 am
Forum: Controls
Topic: controller auto reset
Replies: 18
Views: 4401

Re: controller auto reset

I think it doesn't matter which level of TL/TH you will keep after periph access routine. Most important is switch it to default right before new periph access. Some doubts I have with 6-button joypat. It is have timeout to fall back to LRUD from XYZM. But I don't know, will it work with TL/TH = 0 o...
by HardWareMan
Thu Jun 29, 2017 9:09 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

I'm on my way to connect my logic analyzer to CD drive connector: http://savepic.ru/14632184.png 1 - CDCK (D-->H) CD mechanism control communication clock 2 - D/M (D-->H) Mute, output '0' for playback and '1' for mute 3 - nIRQ (D-->H) Interrupt request 4 - nRES (D<--H) Reset the CD hardware 5 - HOCK...
by HardWareMan
Wed Jun 28, 2017 6:33 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

The drive ribbon wire has these signals:
Image
Did it enough for you?

I must make some handy remote pins because MD1 sits above MCD1 and all PCBs are located under MD1 and MD1 apply some force to EXT connector without detent on the opposite end.
by HardWareMan
Wed Jun 28, 2017 5:43 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

I have MD1 and I can make some records for you.
by HardWareMan
Sat Jun 24, 2017 3:59 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

Every frame of 98 contains not only subchannel data but left and rigth channel samples. I don't remember how much but I guess 6 of each. 44100 / 75 / 98 = 6. 6 * 2 * 2 = 24 bytes.
by HardWareMan
Wed Jun 21, 2017 2:41 pm
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

KanedaFr wrote:Sorry but your first post was a mistery, like..."yes 12...and so ?" ;)
Quite round integer after division, isn't it? I just was want to show this fact. The rest you should have guessed yourself. In fact, there tons of frequencies that pretty multiples to each other. With integer multiplier.
by HardWareMan
Wed Jun 21, 2017 11:22 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: HDD (or flash) instead of a CD, questions...

Again: 384 / 2 / 16 = 12. Because 2 channels with 16bit in each. 12x oversampling for one bit Delta-Sigma DAC.
by HardWareMan
Wed Jun 21, 2017 3:35 am
Forum: Hardware
Topic: HDD (or flash) instead of a CD, questions...
Replies: 140
Views: 47591

Re: Re:

KanedaFr wrote:
TmEE co.(TM) wrote:the 16MHz is 16.934400MHz, which is CDDA bitclock.
I don't understand where this value come from....
16 934 400 / 44 100 / 2 / 16 = 12.
by HardWareMan
Tue May 02, 2017 4:16 am
Forum: UMDK
Topic: MD hangs after playing any PCM file
Replies: 69
Views: 17323

Re: MD hangs after playing any PCM file

The bus buffers I'm also using another part because I don't trust those 5<->3.3V bidirectional converters. I'm stepping down the 5V signals to 3.3V, but not the other way around. You totally right. There was another project with FC stuff and bidirectional automatic shifters created a big headache. ...
by HardWareMan
Tue Apr 25, 2017 4:25 am
Forum: Sound
Topic: too many YM2612 infos ?
Replies: 14
Views: 3904

Re: too many YM2612 infos ?

It is a one of possible variant.
by HardWareMan
Wed Apr 19, 2017 3:25 am
Forum: Hardware
Topic: DS 16
Replies: 2
Views: 1758

Re: DS 16

Also it has no VD12-VD15. But it provide higher addresses and CE0. Also, it provides MRES and M3. So, basic signals it takes from EXT port, higher addresses and CE0 via this cartrige (that's why 244s need for) and able to MRES (more powerfull than VRES!) and M3. Simple and clever I think.
by HardWareMan
Tue Apr 18, 2017 2:36 pm
Forum: Sound
Topic: too many YM2612 infos ?
Replies: 14
Views: 3904

Re: too many YM2612 infos ?

As I said before, leave discussion and create separate topic for pure checked info only.