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Re: Audician/Labway YMF71x hardware differences

Posted on 2021-08-14, 16:08

Great! I can take L1 from the other card and place it on L3 to the other. Both cards get better and no extra components needed. I'll order different capacitors for the lowpass mod just in case then. So the connector near mic input contains two mono inputs? I suppose it is not possible to configure …

Audician/Labway YMF71x hardware differences

Posted on 2021-08-13, 14:18

I have two different revisions of the Audician / LWHA151A00 A151-A00 cards. Here are some pictures . Older revision has YMF718-S and the later YMF719E-S but I'm not talking about those. The YMF719 revision doesn't have L1 and L3 but the earlier revision does. Also the YMF719 revision doesn't have …

Re: Copam U-series 486

Posted on 2021-08-09, 07:43

And now we have verify speed on speedsys. It was a bug in XTIDE Universal BIOS verify functions after all. All I did was a quick dirty fix without proper error handling. I'll need to make it a better one before I commit code to repository. https://drive.google.com/uc?export=download&id= …

Re: Copam U-series 486

Posted on 2021-08-07, 18:52

There is third issue as well. Notice in the pictures above that the Toshiba in DX4 system has a bit larger capacity. It is what it is supposed to be, 117 210 240 sectors, as defined in Toshiba datasheet. Why the two are less than that? All the drives were new (sealed bag) but none were empty. They …

Re: Copam U-series 486

Posted on 2021-08-07, 18:26

One thing I did notice is that the HDD seems to automatically enter some sleep mode. It is not unexpected that it has such feature. XTIDE Universal BIOS has power management support but it is for enabling it. I'll need to check if it is actually left at drive default when it is set to disabled from …

Re: WP32 McCake : MT32 compatible waveblaster board

Posted on 2021-08-06, 08:55

MT-32 mode seems to have left and right channels reversed but fluidsynth mode does not. It is easy to test with Wing Commander. In the room where water drops to bucket the drop sounds are on left channel but the bucket is on right side of the screen. When switching to fluidsynth mode the water drops …

Re: Copam U-series 486

Posted on 2021-07-29, 09:29

Here are the results from Copam. No surprises there. I tested the Toshiba 1,8" HDD and Hitachi microdrive. Both have the same transfer rates because ISA limits the speed to 3,1 MB/s (actually that is a very good for ISA). Seek and access times are about the same as seen on a DX4 system previously.

Re: Copam U-series 486

Posted on 2021-07-28, 20:23

Anyone interested how fast the 60 GB 1,8" Toshiba hard drive is? I must admit that I'm positively surprised. It easily outperforms any period correct drive from socket 7 era and perhaps from super socket 7 era as well. I installed last of my HDD-CF-drives to my 486DX4 system (I had to disassemble it …

Re: Gravis Ultrasound Max with HardMPU Issues

Posted on 2021-07-26, 04:21

I haven't had GUS MAX for a long time so I can't test this anymore but GUS MAX has codec that requires ports of its own. I remember having some configuring problems as well. If I remember correctly setting the GUS MAX to 2x0h requires 3x0h to be available as well so if you have GUS MAX port set to …

Re: Copam U-series 486

Posted on 2021-07-24, 09:25

Just a few minor things I've observed: No buffer overflows with old type rev 1.07 MT-32 so 486 @ 33 MHz is really nice for that also. Another thing I could have tested with DX2 is when the overflows start to happen. I suspect the CPU cannot be much, if any, faster. I mentioned earlier about having …

Re: Copam U-series 486

Posted on 2021-07-19, 06:25

Headland datasheet did not help. I tried a few things with DOS debug but nothing helped. So I think hardware is ready for now. I'll try another RAMDAC if I find one. But for now I think this computer is finally ready. But one more thing about the RAMDAC issue. I should have tested again with the DX2 …

Re: Copam U-series 486

Posted on 2021-07-16, 17:19

I got the port trapping somewhat fixed. Meaning colors are better like when no trapping at all, so colors are not quite correct on the problematic games. I think the problem was that there is some time frame to output all red, green an blue values and that was not met when trapping ports and …

Re: Copam U-series 486

Posted on 2021-07-14, 16:25

I'm actually trying to code such TSR but no luck so far... I can trap the ports and non-problematic games continue to work fine. But the problematic games now have even more wrong colors even when internal cache is disabled! Results are the same even when I don't do anything in the EMM386 handler …

Re: Copam U-series 486

Posted on 2021-07-14, 04:56

I did a little more testing last night. Color problems are gone when CPU is set to 16 MHz but they appear again at 20 MHz. I could modify the switch at the back of the computer to 16 / 33 MHz (change of two jumpers is needed instead of one). 16 MHz is faster than 33 MHz with internal cache disabled. …

Re: Copam U-series 486

Posted on 2021-07-13, 16:37

New RAMDAC arrived, or actually 16-bit Tandy VGA card with WD90C30-LR controller. It is no wonder similar card performs so well on my 286 because it is fast, just as fast as CL-GD5426. I didn't expect it to be that fast. I updated results to the spreadsheet. WD controller is older, maybe one year or …

Re: WP32 McCake : MT32 compatible waveblaster board

Posted on 2021-07-13, 10:32

not sure if there are any differences in the recording itself, but for my ears the DB50XG sound is in a completely different, better, league. I too think that DB50XG is the best of them but the Phoenix soundfont is a good alternative for real Yamaha. I tested the Phoenix soundfont more with some GM …

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