Re: XT/CGA laptop dissection

Posted on 2015-08-17, 12:08

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

I've already got the DRAM chips but I prefer identifying extension connector before I burn my laptop Here is what I've found so far EXT_BUS.jpg And here is the J1 connector for the HDD daughterboard 8 IRQ5 3 4 32 36 37 40 GND 5 6 35 36 +5V 21 DRQ3 23 /DACK3 34 +12V For your dead HDD, there is …

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Re: XT/CGA laptop dissection

Posted on 2015-08-16, 18:09

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

@matze79 Thanks for the idea, this screen is really dim I usually hold the laptop with the screen almost horizontal I've just opened the lcd and I found it's an Optrex DMF651

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Re: NE2000 cards and internet access

Posted on 2015-08-14, 21:40

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by StickByDos

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have you tried mTCP ? Maybe it will be more up to date for your router

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Re: XT/CGA laptop dissection

Posted on 2015-08-14, 11:43

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

I think there is a way to upgrade this laptop to 2.5MB (640kB + 1920kB EMS) Here is what I found after reading 82C100 data sheets Still untested Set JP1A and JP2A to 1-2 (the 2 jumpers between memory banks) Put 4 514400 in the DIP20 sockets U8-11 with pin 4 and 5 lifted out Connect JP1A 3 to U8 and …

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Re: XT/CGA laptop dissection

Posted on 2015-08-13, 21:25

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

1 Pin 7 in unused on CGA but on MDA/Hercules, it is monochrome output. 2 For a real CGA to VGA, you need a frame doubler, IIRC, CGA modes on VGA card are displayed with each lines repeated twice to accommodate VGA monitor sync rate (CGA 200 lines are turned into VGA 400 lines) CGA composite relies …

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Re: XT/CGA laptop dissection

Posted on 2015-08-12, 17:49

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

The NTSC/PAL encoder is missing from the schematic, it is just the input stage. But the brown color fix is present.

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Re: Wrong colors with CGA composite, how to fix/check it?

Posted on 2015-08-12, 17:33

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by StickByDos

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Search if your TV has a Tint (also called Hue) control in the image settings menu.

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Re: XT/CGA laptop dissection

Posted on 2015-08-11, 11:51

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

According to to there, green intensity is reduced when color 6 is detected. It can be implemented with logical gates circuitry, 4 inputs, 5 outputs, corresponding to CGA RGBI and an alternate green output with an extra resistor, that is used when color 6 is detected.

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Re: Decent retro gaming laptops

Posted on 2015-05-09, 23:23

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by StickByDos

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

T2150CDT I had one, I used to play Duke Nukem 1.3D on it at 640x480 but you have to get a docking station to connect a joystick or a ps/2 mouse, its ps/2 ports on the only support keyboard/numpads Dell Latitude CPx J650 Pentium III-M 650 Ati Rage Mobility M1 8MB Its sound chip works in real mode …

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Re: Making Audigy 2 work in DOS

Posted on 2015-04-26, 09:42

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by StickByDos

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your autoexec.bat and config.sys don't use the same IRQ SET BLASTER= A220 I 7 D1 H5 P330 SBESET -A220 -I 5 -D1 -H5 -P330 -j0 -d1 -w0 -c Don't reserve IRQ for ISA, it's a PCI sound card (emulating an ISA card...) Check the advanced properties in control panel if you can assign resources manually for …

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Re: Best OS for a 286?

Posted on 2015-04-12, 03:33

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by StickByDos

in Milliways

in Milliways

NEAT can't handle 4MB SIMM but can handle 8 SIMMs and when you have 8, you can enable a 4 way memory interleave mode In 12.5MHz vs 16MHz 286, with NEAT you can can choose ISA bus clock as CPUCLOCK, CPUCLOCK/2 or ATCLOCK and the processor running at CPUCLOCK or ISA clock With 12.5MHz, you can make …

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Re: Best OS for a 286?

Posted on 2015-04-11, 18:58

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by StickByDos

in Milliways

in Milliways

I couldn't test this image, my 1440k disk are so worn. So I made a 720k with ke2041_86f32.zip and com082pl3-bin8086.zip It booted correctly with XT-IDE BIOS With VSPAWN.COM, I could only get 546k with 75k eaten by COMMAND.COM

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Re: The next mTCP update is coming soon ... last call for bug fixes and ideas!

Posted on 2015-04-11, 17:37

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by StickByDos

in Release Announcements

in Release Announcements

Hi Mike, A feature I would like is accented characters handling on IRC When you're use using ASCII when everyone IRC is using utf8, you see and send some garbage Both text must be identical on screen

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Re: Best OS for a 286?

Posted on 2015-04-11, 00:03

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by StickByDos

in Milliways

in Milliways

I've just tested the freedos boot floppy on a real 286 It has a bug with XT-IDE bios It booted without detecting hard disk, I had to set a dummy hd in pc bios. Freedos complained during boot but it was normally accessible as C: Fdisk destected it as 2nd hd with dummy hd as 1st. I've not yet tested …

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Re: Best OS for a 286?

Posted on 2015-04-08, 00:13

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by StickByDos

in Milliways

in Milliways

Me too I have a 8MB 286, this one is a 12.5MHz SBC based on NEAT chipset, from 1989. POST lasts 30s due to unskippable memory test BIOS reports itself as an IBM 7531 Industrial AT I bought a bunch of EPROM off eBay, I need to upgrade the BIOS. Original one is so buggy. the most obvious is that it …

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Re: XT/CGA laptop dissection

Posted on 2015-04-07, 23:26

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

I didn't know this, thanks. I've just tried and I discovered with C&T MIPS 1.20 CTRL-ALT-F7 4.77MHz (MIPS 0.22) CTRL-ALT-F8 10MHz (MIPS 0.43) CTRL-ALT-F9 Invert LCD CTRL-ALT-F10 Switch off LCD

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Re: XT/CGA laptop dissection

Posted on 2015-04-05, 10:46

by

by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

Here are the files but hard disk has also files for others Victor laptops On mine, battery still hold charge for 1 hour. I wish someone could make a special version of XT-IDE for larger hard disk, hd controller is on a daughterboard that could be replaced and hd bios is on a socket on the …

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Re: XT/CGA laptop dissection

Posted on 2015-04-05, 02:20

by

by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

Hello, I've just seen your topic, I too have a V86P Its hard disk is still working and it was still carrying the program to generate the reinstallation disks for Victor MS-DOS 4.01a french It has EMS driver and an utility to switch grayscale dithering mode between 9 modes

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Re: My 98se laptop

Posted on 2014-12-07, 20:17

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by StickByDos

in Marvin \ System Specs

in Marvin \ System Specs

Hello, (just passing here) I had a Dell Inspiron 8000 years ago, now it is dead For the onboard NIC, behind the connector, there is just a cable that go to the MiniPCI compartment accessible by a door on the underside. You just have to replace the card Actually, I got it with just a MiniPCI 56k …

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Re: 386 vs. DVD-ROM drive

Posted on 2011-06-29, 23:03

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by StickByDos

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello, I use this driver for DVD with DOS I managed to read files on DVD but you need SHSUCDX instead of MSCDEX MSCDEX has bug with lowercase filenames on DVD

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