Re: Can my Sound Blaster Pro 2 be saved?
Posted on 2020-08-03, 08:44
Recap and/or replace YAC512 DAC IC, assuming there is no other obvious damage. One of the 3403 op-amps (not sure which one) might be faulty as well. In any case it can be saved.
Re: Voodoo Banshee JP1 Jumper Block - What does it do?
Posted on 2020-08-01, 07:04
VMI_DATA4 - VGA OR MULTIMEDIA PCI DEVICE CLASS 1 = PCI MULTIMEDIA DEVICE 0 = PCI VGA DEVICE TYPE Note: R25, R26 & JP1 are only intended for 3DFX engineering use. Production designs should only stuff R2, VGA configuration. That's (both this text and jumper block) direct copy-paste from reference …
SB 2.0 CT1350 capacitors
Posted on 2020-07-25, 06:54
Greetings. I'm trying to assemble one of these cards from scratch, and I need some help with capacitors, especially electrolytic ones, since their values cannot be seen on photos. Only capacitance (in uF for bigger ones or code, like 104 or 331 for small ones) is needed.
Re: Newly made ISA CL-GD5434
Posted on 2020-07-08, 05:48
Finally my ICs were shipped, now I need to order PCBs and search for STB Nitro64 BIOS. Uploaded to github, if you see errors - please PM me. https://github.com/Leshak-pcb/Pine-CL-GD5434
Re: Newly made ISA CL-GD5434
Posted on 2020-07-01, 07:19
I know a 4MB version has been written off (and perhaps not all that useful), but wouldn't it still be nice to leave a few solder pads to allow the end user to add 4MB if they want? It's not written off, just not in the first revision. If you can solder SOJ IC-s you'll be able to double-stack them. …
Re: Newly made ISA CL-GD5434
Posted on 2020-06-30, 19:36
Ok, looks like I've routed everything. Now it's time to correct silkscreen, optimize and double-check everything else. And I've probably have lots of time for this - Utsource still can't send me IC's I've ordered. Few notes: 1) It's 2mb only for now. 1mb won't work due to schematic modifications …
Re: Newly made ISA CL-GD5434
Posted on 2020-06-02, 08:21
Tiny update: I'm still working with basic PCB layout, progress is slow - I've got lot's of other work. If you want to help & have some knowledge in electronics I can send schematics so you can check it for obvious errors. Meanwhile I've discovered that VGA filter capacitors on my Matrox Millennium …
Re: Newly made ISA CL-GD5434
Posted on 2020-05-18, 07:50
I am waiting for this to happen - 4mb is certainly not worth it , maybe keep it 2mb and sockets to upgrade to 4? higher resolutions and depth don't like iSA much but maybe some ISA 486DX2 could use them For 486DX2 any VLB VGA will be much better choice. SOJ40 sockets cost more than appropriate RAM, …
Re: Newly made ISA CL-GD5434
Posted on 2020-05-16, 11:58
Perhaps you should use 4mb of memory with a gd543-4. Someone told that their ISA GD5424 was too slow to be of help to their 486. What type of machine would an ISA GD5434 actually accelerate? My target CPU is 386 or 486DLC. 4mb - probably as an option, but imo that's overkill - it's only needed for …
Re: Newly made ISA CL-GD5434
Posted on 2020-05-14, 10:43
There is an example of a Trio64V graphics adapter for PCMCIA (NOT Cardbus), which is more or less ISA for laptops. It probably has a bridge chip to do this. A good GUI accelerator? Would a card like this work with a 286? Are there 286 compatible Windows drivers with support for the GD5434? Could …
Re: Newly made ISA CL-GD5434
Posted on 2020-04-03, 08:38
CL-GD5434 stocks are high and prices are low (7$), so there is no need to salvage it from PCI cards. Most expensive parts at this moment are PCB (since it's gonna be 4-layer) and 2mb of FPM DRAM (might be cheaper if it'll work with EDO). As for Trio64-based ISA card - I'm pretty sure that's …
Newly made ISA CL-GD5434
Posted on 2020-04-02, 15:11
Is there anyone interested in newly made ISA CL-GD5434 card (similar to STB Nitro 64 or Diamond Speedstar 64)? Performance-wise it won't be faster than Tseng ET4000, Trident 8900D or AVGA2, since they are all bottlenecked by ISA bus, but still it will be a high-end ISA VGA with GUI acceleration. …
Re: Orpheus Soundcard: a new DOS soundcard with SPDIF/OPL3/MPU support
Posted on 2020-02-11, 20:41
I'd vote only for one additional feature - S/PDIF TTL header (like on creative cards) or an optical out instead of RCA jack. And a DIY kit - complete or board with main components only.
Re: Tandy 3 Voice Sound - SN76489 ISA Soundcard Project
Posted on 2019-10-21, 06:09
Is there any reference in datasheets or other tech docs for the capacitor on SN76489 pin 7 to 9? SN76946 datasheet only recommends 10R & 0.1uF RC from output to ground.
Re: Tube Time: Announcing The Snark Barker, a 100% Compatible SB 1.0 Replica!
Posted on 2019-08-09, 18:33
Finally I've completed my Snark Barker, with "line" out wired before the volume pot. It sounds better with less noise, and the volume level is ok. Looks bit messy though. The SAA1099 chips are pretty hot - is this normal?
Re: AWE64 Gold CT4390 Firmware
Posted on 2019-07-06, 08:35
Edit: to answer Jager's question, the config EEPROM contents in the Dell utility starts at offset 6436 and ends at offset 6599. If the utility (somehow) can be properly expanded to fit the entire 512 bytes, then the CT3670 and CT3990 config data can fit there at least. I have necessary eeprom …
Re: AWE64 Gold CT4390 Firmware
Posted on 2019-07-05, 20:09
Looking at the exe I've attached I think that the actual firmware is right at the beginning of the file. Maybe it can be altered? Also it is also possible to program 93c46/66 eeprom via LPT port, but you need soldering skills. (in russian http://www.sblive.narod.ru/UpToRealLive/UpToRealLive.htm) So …
Re: AWE64 Gold CT4390 Firmware
Posted on 2019-07-05, 15:16
That's the only software I'm aware of. It's from DELL website, extracted from AWEFlsh.exe, and it updates on-board eeprom, making any AWE card into, presumably, CT4502. Edit: There is also sb2awe, capable of writing anything into boards eeprom, but it's pretty hard to find.
Re: All-in-one: the wrong way. Need advices.
Posted on 2019-07-02, 15:22
From board manual: "DIM1 and DIM2 only support 3.3V (unbuffered) EDO and SDRAM modules." Not sure how this supposed to work, since there is no voltage converter near RAM slots and I measured 5V over empty slot. Probably SDRAM should be 5V-tolerant, I've read about such modules, but mine are 3.3V- …
Re: Tube Time: Announcing The Snark Barker, a 100% Compatible SB 1.0 Replica!
Posted on 2019-07-01, 08:55
Just a thought - tapping to the volume pot bypassing the TEA2025 should give a less noisy line-level output, am I wrong?
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