Re: 4 Sound Card DOS System

Posted on 2020-07-05, 16:55

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

If your CT2760 has DSP version 4.13, that card is quite versatile for your build. While the hanging note bug can be observed with DSP 4.13, there are numerous reports that it does not occur in conjunction with the CT1747 bus interface chip (which is used on the CT2760 card). So this card gives you …

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Re: Help to identify a CGA card

Posted on 2020-07-05, 13:08

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Recently I've acquired a CGA card, but I don't know what model and manufacture is. The card has some jumpers and I would like to know what they are for . Any idea? Have a look at this documentation about the original IBM CGA card: https://www.seasip.info/VintagePC/cga.html . The original IBM card …

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Re: For best performance: Is manufacturers imprinted recommendation a LIE?

Posted on 2020-07-05, 09:25

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is a picture of the board. Contrary to the manufacturer suggestion, the top performance 486-class processor is installed. The PODP-83 is likely faster in most benchmarks, but it misses the 486-class target. The heatsink has been removed for showcasing the processor type. EXP4044-overview.jpg …

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Re: EGA card -> MDA Monitor

Posted on 2020-07-01, 20:57

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes, EGA set to "monochrome" monitor needs a 18kHz/50Hz monitor, ie. MDA/Hercules. Note that with such a setup, you won't be able to use all EGA modes, only 80x25 text and 640x350 3-gray graphics. Exactly. And the 80x25 text mode is video mode 7 (activated in DOS using "MODE MONO"), not modes 2/3 …

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Re: QEMM specify XMS limit for older games?

Posted on 2020-06-30, 05:46

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I'm using QEMM in a new project, but I'm not too familiar with it. I need to limit the XMS for some older games to work, and I only know about EMM386 options. Does anyone know a solution for QEMM? QEMM includes a utility called "XMS" that allows you to allocate and free XMS blocks from the command …

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Re: My new 8088 motherboard

Posted on 2020-06-28, 11:06

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The memory interface on that board is fascinating! You can choose between 424256 chips (which are 256k x 4) or 421000 chips (which are 1M x 1), and also a single 256K x 4 chip. So in no way you can build a byte-wide x8 memory bus from that. Instead, it looks like the memory interface is built around …

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Re: All the truth about FM in ALS100 Plus+ cards (includes facts, tech info and tests)

Posted on 2020-06-28, 10:43

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by mkarcher

in Marvin \ Sound

in Marvin \ Sound

This has what appears to be a Motorola LS245 20 Pin chip on board. Is this an OPL clone? https://i.imgur.com/2OqAqc8l.jpg No, that one is the real 74LS245, an 8-bit buffer chip. You can be sure because 8 pins on one side of that chip are directly connected to the ISA data pins. That does not fit …

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Re: How to upgrade memory on my 386sx

Posted on 2020-06-28, 10:36

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tried messing with the rsel jumpers, rsel0 sees 2048, rsel1 gets me 1743mb, and rsrl2 limits it to 512kb. Any combination my max is still 2048, if rsel0, and 2 are selected it's 512kb and rsel 1 turned in with anything is a black screen. Dunno if that helps at all RSEL2 RSEL1 RSEL0 Bank 0 Bank 1 …

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Re: Famous computer slogans and quotes ?

Posted on 2020-06-27, 23:46

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by mkarcher

in Milliways

in Milliways

Trust: power you can count on After experiencing the awesome quality of this brand a friend and I used to call it: "power bomb with count-down"

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Re: How to upgrade memory on my 386sx

Posted on 2020-06-27, 23:23

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Any idea what the rsel jumpers mean. I wish I could find the board in th99 It's in the VL82C202 data sheet. You just have to find out whether jumper set means "1" or "0", but your previous experiments should be enough to know: RSEL2 RSEL1 RSEL0 Bank 0 Bank 1 0 0 0 reserved setting 0 0 1 512KB empty …

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Re: Newly made ISA CL-GD5434

Posted on 2020-06-27, 23:01

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by mkarcher

in Marvin \ Video

in Marvin \ Video

On my 386DX40, the GD5428 1meg card I bought didn't run stable during all windows 3.1 benchmarks unless I disabled 0 wait state operation. Because the card did not come with a jumper to toggle this, I actually used a bit of plastic in the slot to forcibly disconnect pin B7 (which it uses to operate …

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Re: CGA/EGA capture with 6€ logic analyser

Posted on 2020-06-25, 15:39

by

by mkarcher

in Marvin \ Video

in Marvin \ Video

no it doesn't more lines = higher pixel clock since they all conform to 60Hz vertical Exactly. As long as we don't go super EGA, we have to deal with two dot clocks: 200-line modes run CGA compatible at 14.318 MHz 350-line modes run at 16.257 MHz (same pixel clock as MDA) As EGA has only 640 and …

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Re: Bought these (retro) hardware today

Posted on 2020-06-24, 05:58

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Concord-Eracom also made hardware cryptographic modules for financial institutions (banks). The first card with the obscured module on the left and the component "do not head above 212F during assembly" actually seems to be a cryptographic module. The key is kept inside that opaque module in static …

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Re: Does this look like an attempted repair?

Posted on 2020-06-24, 05:46

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This doesn't look like an attempted repair, but to scratching damage. I had something similar happen to my Adaptec 1542B, when I put it into the same antistatic bag as a more modern graphics card. I placed those cards solder-side to solder-side, which usually turns out well, but in this case, the …

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Re: Error: Invalid \ No keyboard code received ?

Posted on 2020-06-23, 01:18

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes you need a XT keyboard or one of the rare XT/AT (Like IBM model M, Hewitt Rand SK-2000R, Nan Tan 6252EA, etc) that either auto switch AT and XT or have a switch to select XT or AT. I know of no cheap ones and do not know how the adapters would work since the KB signals and KB controller for XT …

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Re: 486DX2-66 project update

Posted on 2020-06-23, 01:09

by

by mkarcher

in Marvin \ System Specs

in Marvin \ System Specs

Thank you for the ideas! I know that serial mice will work on this system, but from what I've seen, PS/2 mice connected to a serial adapter will not work. The simple small PS/2-to-serial plug adapters do not convert any PS/2 mouse into a serial mouse. For these adapters to work, you need a special …

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Re: Are there any soundfonts (sf2, GM) for some old soundchips?

Posted on 2020-06-23, 01:00

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

I am not sure I understand your question. If it is about getting a Creative Labs sound card with a driver including sound fonts, you could get a Soundblaster Audigy 2 NX. The driver (at least the package for old versions of windows) comes with the standard sound fonts that were also supplied with …

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Re: 486DX2-66 project update

Posted on 2020-06-22, 23:43

by

by mkarcher

in Marvin \ System Specs

in Marvin \ System Specs

Yeah, this is what i meant, i apologize. I think a lot of older serial-mouse only boards might be confused by applying ground on one of the RS232 lines if the board doesn't have the necessary filtering, because I wonder if the occasional crashes are coming from the PC reading noise on the line as …

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Re: Pentium MMX 450MHz

Posted on 2020-06-22, 23:27

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Just for the record, screen shots of K6-2 and K6-3 running on the same mainboard with the same settings. write performance in MB/s K6-2 K6-3 Tillamook L1 MMX 2425.74 2489.26 169.60 L2 MMX 245.39 1248.84 168.95 L3 MMX 245.34 Mem MMX 110.00 144.89 169.21 BTW why write performance is such BS on many …

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Re: Are there any soundfonts (sf2, GM) for some old soundchips?

Posted on 2020-06-22, 22:55

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Well, the music synthesizer on the SB!Live is nothing but a hardware-accellerated SF2 playback engine. You can get the same music synthesis one gets from the SB!Live (save for the reverb/chorus, which is not Soundfont-based, but added by a separate effects section) by using the SoundFonts shipped …

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