Re: Corrupt characters with ELSA Winner 1000 EISA / ISA Graphics Card

Posted on 2024-04-19, 20:20

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Today the chips arrived - not the PCI version luckily. (Usually you can read that -P is the PCI version, but the -P version without "PCI" printing can be found on ISA, VLB and EISA cards.) The "PCI" just indicates that the chip support the PCI bus if it is strapped for PCI support . The datasheet …

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Re: Corrupt characters with ELSA Winner 1000 EISA / ISA Graphics Card

Posted on 2024-04-19, 18:56

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

There seem to be certain rules at work, like when I type numbers: 0->0, 1->0, 2->0, 3->3, 4->4, 5->4, 6->4, 7->7, 8->8, 9->8..... Check for a short between video memory data bit 0 and 1. All the replacement patterns you quote have these two bits at the same level. As the '928 is a VRAM-based system …

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Re: Pentium PRO?

Posted on 2024-04-19, 06:50

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Agree with all the answers. There is something special about a P.Pro even though it is not optimized for 16bit OS it is superb in full 32bit OS compared to Pentium. Exactly. Intel never intended DOS / Win95 as target audience when they designed the Pentium Pro. The Pentium Pro was meant as "serious …

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Re: How to calculate Pixel Clock

Posted on 2024-04-19, 06:37

by

by mkarcher

in Marvin \ Video

in Marvin \ Video

According to these specs, this is an attempt to calculate lower level details of the maximum the monitor can handle : *Maximum Pixels per line = Pixel Clock / Line Rate = 8000000 / 60000 = 1333.3333... *Maximum lines per frame = Line Rate / Frame Rate = 60000 / 75 = 800 These calculatons are …

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Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card

Posted on 2024-04-18, 20:49

by

by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Jackal1983 wrote on 2024-04-18, 20:42: I was planning to buy F series chips, the should be ok from that angle. Yes, confirmed.

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Re: An EIZO branded extended 8514/A compatible CAD/GUI accelerator: The AA41

Posted on 2024-04-18, 20:27

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by mkarcher

in Marvin \ Video

in Marvin \ Video

Chapter one, containing a short hardware description is attached as a ZIP file. The pages about the configuration utility GACONFIG for DOS and OS/2 are Filename GACONFIG_DOS.jpg File size 737.67 KiB Views 390 views Filename GACONFIG_OS2.jpg File size 250.44 KiB Views 390 views The 4 pages about the …

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Re: An EIZO branded extended 8514/A compatible CAD/GUI accelerator: The AA41

Posted on 2024-04-18, 20:08

by

by mkarcher

in Marvin \ Video

in Marvin \ Video

These are the contents of the three floppy disks. Due to mechanical surface damage (a dent in it), I was unable to read one of the sectors of Disk 1 (Utilities and Drivers) with a correct CRC. The bad sector is part of AI.EXE, the standard 8514/A compatible software interface driver (the "Adapter …

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An EIZO branded extended 8514/A compatible CAD/GUI accelerator: The AA41

Posted on 2024-04-18, 20:02

by

by mkarcher

in Marvin \ Video

in Marvin \ Video

I recently got my hands on an EIZO branded graphics card. While this company is best know for their monitors, they also sold graphics cards. For example, EIZO had the AA40, which is displayed as one of the C&T 82C480 based 8514/A clones . That card seems to be a straight-forward implementation of …

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Re: BLASTERBOARD : A new SB 2.0-compatible ISA sound card

Posted on 2024-04-18, 18:07

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by mkarcher

in Marvin \ Sound

in Marvin \ Sound

Thanks, just trying to save some cash, F series seems to be a bit more available than the HC or HCT series chips Just for information, in case you are not aware of it: Do avoid HC chips for interfacing with TTL logic system (like the ISA bus). A TTL system expects a receiving chip to treat 2.1V as …

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Re: Are any new Baby-AT boards being made that support 500MHz or faster CPUs and will fit in an IBM 5160 chassis?

Posted on 2024-04-16, 05:41

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I took the board to a friend who does that service, he said he couldn't source any of the proper capacitance. Now that I'm looking for myself, I'm seeing several options for them online. Is Amazon a good source? I strongly recommend buying low-ESR caps from an established reputable brand like …

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Re: Additional ram recognized but not usable

Posted on 2024-04-13, 22:50

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here is the correct photo of the 16 chip DIMM-- Samsung K6S280832a-TC1L - 4 bank PAGE BURST - 16Mx8bit I'm surprised that it worked on the EX board and the BX board. Now, it is no surprise that this module works. You are no longer dealing with single-rank modules. This is a dual-rank module, each …

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Re: Additional ram recognized but not usable

Posted on 2024-04-13, 07:50

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I tested three 8 chip DIMMs and they all tested out at the correct capacities, 64MB, 128MB, and surprisingly 256MB on both the EX & BX chipsets. HYB39S64800CT-8 - 4 banks × 2 MBit × 8 HY57V28820HCT-H - 4 banks × 4 MBit × 8 HYB25D25600BT-6 - 4 banks × 8 MBit × 8 The 256MB one is really strange. …

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Re: Floppy disk problem

Posted on 2024-04-09, 20:48

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You might try a different IDE Interface Card as well. Maybe another one will not respond to 3F7 at all.

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Re: Floppy disk problem

Posted on 2024-04-09, 18:37

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Tried a few new drives and cables same problem, added normal drive back problem was gone note sure if the cf card is the problem but without it . Works like it should The CF card might indeed be the problem. This is one of the very strange designs in the IBM AT: The ISA I/O port 3F7h is shared …

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Re: Asus VL/I-486SV2GX4 with 60MHz bus?

Posted on 2024-04-09, 18:26

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

One thing I find odd is that no chipset manufacturer in the VLB era ever considered implementing the IDE controller inside the chipset for higher performance. That would have made the VLB solely a dedicated graphic port, as it happened with AGP a few years later. Some late 486 chipsets have an …

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Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-09, 17:45

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by mkarcher

in Marvin \ Video

in Marvin \ Video

DOS text mode output (80x25) can be done with just 230kB/sec Not really. On the PC, there is no "line cache", so each text line needs to be retrieved for each scan line of the character. For example, on CGA, in high-res text mode, a character takes 8 pixels at 14.318MHz pixel clock, which is 1.8 …

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Re: It is possible to safely repair a DRAM module with a bad pin?

Posted on 2024-04-09, 07:36

by

by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

If the gap is to large to bridge with solder many, myself included like to use the leg from a cap or resister. In the case of the fine traces of an SDRAM modules, a capacitor or resistor leg may be too bulky. In that case, I use single strands from stranded wire. You don't have to cut the tiny …

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Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-09, 07:27

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by mkarcher

in Marvin \ Video

in Marvin \ Video

While you had one wait state on expansion cards for 16-bit cycles on the AT (just as the AT also used for RAM), RAM cards (and other cards that claim areas of 128KB contigous memory address space) can remove that wait state for memory cycles by activating the /0WS signal, and thus operate at …

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Re: Can a faster ISA Graphics card be built?

Posted on 2024-04-09, 06:52

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by mkarcher

in Marvin \ Video

in Marvin \ Video

Shagittarius wrote on 2024-04-08, 22:35: I'd rather see an ISA card with a HDMI or DP out that does internal upscaling to 4k. Actually I'd like that for a PCI card too. Without upscaling, there is the CRT Terminator: CRT Terminator Digital VGA Feature Card ISA DV1000 .

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Re: Multimeter recommendation

Posted on 2024-04-08, 20:17

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by mkarcher

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

boby wrote on 2024-04-08, 20:09: Which brings me to one more feature I would like it to have, and that is that it has automatic value change. The usual name of that feature is "autorange" or "automatic range selection".

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