Re: CVX-2 : covox adapter
Posted on 2017-12-01, 22:35
CVX4 got mentioned on Adafruit! https://blog.adafruit.com/2017/12/01/cvx4-par … ch-thing-clone/
Re: Maximum amount of memory on a 486
Posted on 2017-12-01, 14:50
I'll have to check my Compaq Deskpro XL466. It's a very late 486, with PCI and 72-pin DIMMs and all. It's also very high-end (workstation-class), with onboard LAN and SCSI. I wonder how much memory that one could take. Here's a Russian page on it with good pictures: http://ru.pc-history.com/compaq- …
Re: Some 8088 Portable Love
Posted on 2017-12-01, 11:16
Strange that it reports an 8Mhz V20, yet the benchmark shows it being the same as a 4.77Mhz 8088. Well, I don't know about V20s, but perhaps it is possible to detect the speed rating of them in some way. So it might detect that the CPU is rated for 8 MHz, even though it is running at 4.77 MHz ( …
Re: Fastest "Turbo XT"
Posted on 2017-12-01, 11:12
As far as I know, officially there are no 8088 or V20 CPUs that are rated higher than 10 MHz. There are HL variants of V20 and V30 rated up to 16MHz. It seems you are right, here is the datasheet (I had only looked at the regular V20 before): http://html.alldatasheet.com/html-pdf/162440/NEC/ …
Re: CVX-2 : covox adapter
Posted on 2017-11-30, 22:25
Mouser does seem to have these, sold separately: https://eu.mouser.com/ProductDetail/Bou ... ent=Bourns
Re: Fastest "Turbo XT"
Posted on 2017-11-30, 20:26
As far as I know, officially there are no 8088 or V20 CPUs that are rated higher than 10 MHz. The fastest 'common' variation of turbo XTs is 9.54 MHz (double that of the original PC). I do vaguely recall however that there were some 'factory-overclocked' XT clones of 12 or 12.5 MHz. But I can't name …
Re: EGA DOS benchmarks?
Posted on 2017-11-30, 12:49
Strictly speaking, there is no such thing as a CGA monitor. The 5153 is a color monitor with digital RGBI input. Restrictions of CGA don't apply, as those come from the video memory limitations of the CGA card, not from the monitor. EGA works, since it is using digital RGBI as well. Only modes with …
Re: Some 8088 Portable Love
Posted on 2017-11-29, 22:48
Obvious question is of course: But will it run 8088 MPH? 😀
Re: Would an FPGA-based "universal" sound card be technically feasible?
Posted on 2017-11-29, 21:41
I think part of the 'charm' of the SID, especially the 6581 models, is a direct result of the manufacturing technology. Since the chip is largely analog, the circuit directly affects how the chip sounds. Poor consistency in manufacturing meant that individual 6581s can vary quite a bit in sound. The …
Re: CVX-2 : covox adapter
Posted on 2017-11-29, 21:32
I think that would be good, except the minimum order is ten thousand because most suppliers don't have these in stock and they have to place order to a factory. I think Jameco was able to sell some R2R-104 devices in multiples of five. I couldn't find any on Jameco, but some googling found me this: …
Re: CVX-2 : covox adapter
Posted on 2017-11-29, 20:58
dreamblaster wrote: R2R ladder if you find suitable and affordable. We could make a solder kit. Would it be one of these? https://nl.mouser.com/ProductDetail/Bou ... X0%2fPY%3d
Re: CVX-2 : covox adapter
Posted on 2017-11-29, 11:51
Wow Scali, that's great to read, thanks ! I will post the link on my serdashop cvx page. You're welcome! Do you see anything that needs to be changed ? You mean to the CVX4? Well no, as a Covox clone, it is everything I hoped for, and more. I can only repeat some ideas I had earlier: 1) Having some …
Re: July 1994 BestBuy flyer on imgur...
Posted on 2017-11-29, 11:37
Oh man, times really have changed. That Acer with inflation calculated would have been 3.5K in today's currency. It was powerful enough to run Doom perfectly at least, and looks like an incredibly useful machine for its time. Yea, seems about right. I got my first 486 system at around 1994 as well. …
Re: Unlocking & downclocking a Pentium II?
Posted on 2017-11-29, 11:31
Doesn't the P2B have jumpers to change the FSB? At least that's what Google tells me. Of course that may depend on the revision... In that case you could change the FSB from 100MHz to 66MHz. Yea, it's still 'oldskool', my P2B-LS (basically the same board, but with the optional LAN and SCSI …
Re: OPL2LPT
Posted on 2017-11-29, 11:30
Generally, serial ports are not compatible with MIDI baud rate, so standard MIDI devices can't work even if physical signal is converted from RS232 voltage levels to MIDI current loop. However, some MIDI modules can be connected to RS232 serial ports with standard PC baud rates. But what if you …
Re: July 1994 BestBuy flyer on imgur...
Posted on 2017-11-28, 19:54
The ppro 150 was the new insane high end by then. The PPro is an interesting point in history. The name already implies that it is only for the server/workstation market. And indeed, it never reached the mainstream. Instead, after the Pentium Pro, Intel split up their range for the first time. …
Re: July 1994 BestBuy flyer on imgur...
Posted on 2017-11-28, 19:35
Of course they were expensive.. the dx4 100 was released in 1994 for $650 alone.. Pentium systems from gateway 2000 were $3000 for base models in late 1993, but they were on the shelves for consumers since 93 for 60 and 66. Well, my point is that people these days tend to google the launch date for …
Re: OPL2LPT
Posted on 2017-11-28, 19:16
There's slight distortion on the sound. I'm guessing that's normal for the adlib era? or do I have a crappy solder joint some place? An AdLib can distort a bit in some cases, but that is done 'deliberately' by the composer then. Normally AdLib music sounds very 'clean'. I suggest you compare it to …
Re: July 1994 BestBuy flyer on imgur...
Posted on 2017-11-28, 18:33
Clear proof that even 486es were still very expensive back in 1994. They didn't even list a Pentium, might not have sold those to consumers yet.
Re: CVX-2 : covox adapter
Posted on 2017-11-28, 16:12
And here is my blog on the Covox/CVX-4: https://scalibq.wordpress.com/2017/11/28/the-covox-years/
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