Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-25, 14:01
appiah4 wrote: Really look forward to seeing root42 assemble and review this. 😎 Looking forward to it as well
Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-24, 19:34
Vaudane wrote: Can I add blasterboard to "bought this retro hardware today" now? xD Yes please!
Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-24, 10:08
You need either 5 or 10 messages (I don't know exactly) posted on the board before you can send PM's. This is done to combat spam. Find some topics where you can add some value and you should be up and running in no time :) Thank you - that's really helpful info that I couldn't find elsewhere for …
Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-24, 10:00
OP––i have just received your PM, but for some reason Vogons will not let me reply. please message me your email address and i will contact you. thanks. I'm in the same position. I'm going to try and contact an admin somehow to sort this out but if zoinknoise's idea above works for you in the …
Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-22, 13:40
Started to combine the kits. First bunch will be shipped next week. Filename IMG_0729.JPG File size 623.72 KiB Views 2213 views
Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-21, 19:32
Awesome work! Considering how much time it took to drill and fit a bracket to the SnarkBarker, this is surely gonna be a heaven to put together! :) Indeed! The guy who drilled them made an awesome work. And these holders are dead-strong. I was sceptical at first and thought they will give the …
Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-21, 19:06
Finally the brackets are ready and I'm very pleased with the result. Filename IMG_0711.JPG File size 472.16 KiB Views 1281 views Filename IMG_0712.JPG File size 326.23 KiB Views 1281 views
Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card
Posted on 2019-06-19, 19:58
Hello boys and girls! :-D Today I received a first batch of PCBs for the kits in ENIG finish! The hardest part was (of cause) making the metal brackets. It took about a month to find a proper solution, because the factory I was hoping for at first, made a sample which was unacceptable. They cut the …
Re: PC Speaker with Soundcards that Don't Have Headers
Posted on 2019-04-28, 02:42
The lower the resistor, the more current is produced (and chance of destruction increases too) and with that higher voltages are possible. 1kohm and higher will exclude possibility of magic smoke aswell. One PC speaker wire is +5V on most motherboards, you want to be careful with that lol. That is …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-28, 02:24
I did not decide on the ports yet, but the idea was to use 500h-50Eh This is gonna produce a problem with cards doing 10 bit address decode, 500...50F range will conflict with gameport due to mirroring from 10 bit decode of some other card. Something to be aware of. Ah, ok. Which region is safe to …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-27, 19:10
Heh, there is one saying.. :lol: I did not decide on the ports yet, but the idea was to use 500h-50Eh, with bits 2 and 3 selectable with a dip switch to select 500h/504h/508h or 50Ch, using 688 comparator and a 138 to decode 10 MSB of the address. A0 and A1 will select OPN2 (01b & 10b) or a PSG (11b …
Re: PC Speaker with Soundcards that Don't Have Headers
Posted on 2019-04-27, 18:36
The circuit in the second link in Scali's post will work fine, but the 100ohm resistor should be 1k or perhaps more to get a level that's not gonna be super loud. Why? As I understand this resistor does not affect sound attenuation, but only pulls up the signal to vcc, which can make the sound a …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-24, 14:17
Ok, here is the plan: to make a prototype asap (say, order 5 pcbs on JLCPCB) with YM2612 and a TI PSG for software development on a working card, h/w tests etc. I'll take one of them and send out other 4 to anyone who is interested and wants to contribute in hardware or software parts. After that I …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-24, 00:22
Thanks for such thorough explanation. Sega’s variant should go in the card for sure, but in which form. 2x PLCC84s do not seem so scary with time) Are they 5v tolerant? And what do you think about that opamp influence on sound Jo22 was talking about?
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-23, 21:16
There's no EPM7256SLC84 so no, two chips are needed, all the 256MC chips are in very large packages like SQP208. There's too much storage needed to put into single chip along with the logic. Most/all of the glue logic should fit into the CPLDs in addition to PSG though. But what are these …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-23, 15:13
2 chips just for PSG, one chip generates the squarewaves and noise, other applies volume and converts it to i2s stream for a standard DAC. GameGear stereo support is also a design goal. 2x 84-pin PLCCs for a PSG? But can it be optimized to at least 1.. 68pin? :happy: Speaking of the Genesis/ …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-22, 19:45
Aliexpress and utsource returned some results on 315-5246 (SMS2 VDP), kinda expensive though. MD VDP and its clones are plentiful (315-5313, SE-95, TA-06 etc.) from various sources but these are QFP128 rather than some through hole part. I'm also making a small CPLD clone but it needs two …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-22, 13:28
SMS VDP should definitely go there, even if the video part remains unused. TI PSG has differences that will be audible in many SMS games and some MD games and some of it cannot be corrected in software. But are these available anywhere? A quick search for 315-series gave no results. You could …
Re: GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-21, 20:35
We probably need to add an MC68k and have the whole thing on ISA slot... ahh, what the heck, who needs that ISA slot?? 😁
GENIE: A Sega MD sound card -- any interest?
Posted on 2019-04-21, 10:57
genie_.jpg I have this experimental project slowly developing for quite a while now - an ISA card with OPN and PSG onboard which, as you all know, replicates Sega MD sound hardware. There are dedicated OPN hardware players like this one , but my idea was that having an ISA card is more fun by means …
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