Re: Toshiba T5200 mods and upgrades

Posted on 2019-05-07, 00:22

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hamby wrote: I haven't had my T5200 out of its case in months Hi Hamby, I haven't looked at my T5200 for a while either, I've been working on another project: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

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Re: Toshiba T5200 mods and upgrades

Posted on 2019-05-07, 00:20

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

mikeyp wrote: I'd love to get it up and running again with either a period hard drive or CF card. I'd be very grateful if you can. Unfortunately there isn't enough free space in the 64K BIOS section to add a copy of XTIDE.

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Re: Toshiba T5200 mods and upgrades

Posted on 2019-05-02, 12:32

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Dear All, I have a small problem with my "new" T5200/200. I would like to install an 8bit ISA to CF adapter (XT-CF ECO LITE) in it as a secondary drive I updated my BIOS to T5200 BIOS V5.30 (Award) patch 1.2 with LOMEM XTIDE 640K (and also tried the T5200 BIOS V5.30 (Award) patch 1.2 with HIMEM …

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-05, 16:10

by

by IanB

in Marvin \ Video

in Marvin \ Video

I've added variable intensity scanlines from 0 - 15 with 0 = black and 15 = about 94% of full brightness. I also switched around the integer heights so there are 3 pixels of video and 2 pixels of scanline although that evens out if interpolation is switched on. Here is the integer version with level …

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-03, 17:43

by

by IanB

in Marvin \ Video

in Marvin \ Video

what kind of latency is there with this adapter? I just figured out a way to test this exactly: I connected a HDMI to VGA converter lead to the HDMI output and then wrote a program to flash the screen briefly. The VGA converter lead is just a simple D to A converter and doesn't introduce much delay …

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-02, 14:40

by

by IanB

in Marvin \ Video

in Marvin \ Video

One caveat about the integer scaling: It only really works well on 1920x1080, 1920x1200 and 1600x1200 monitors as there have to be enough LCD pixels to fit the integer scaled output. e.g. CGA and EGA lores scale from 640x200 to 1280x1000, EGA hires scales from 640x350 to 1280x1050, MDA scales from …

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-02, 10:46

by

by IanB

in Marvin \ Video

in Marvin \ Video

looking good! I have to ask , what kind of latency is there with this adapter? When the input and output frame rates match and they are genlocked together (e.g. CGA/EGA 60Hz to 1080p60), the phase relationship is arranged so that the source video is written to the Pi's frame buffer approx 1ms …

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-02, 01:09

by

by IanB

in Marvin \ Video

in Marvin \ Video

For comparison, here's a closeup of scanlines with interpolation switched on to even out the 3:2 lines: Filename interpolation.jpg File size 675.85 KiB Views 8000 views (The Pi can't screencap the interpolated output as that's done in hardware by the Pi's GPU)

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-02, 00:37

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by IanB

in Marvin \ Video

in Marvin \ Video

this is all very interesting, how can I build this to test? The PCB design and code are on github This is my fork: https://github.com/IanSB/RGBtoHDMI/tree/dev This is hoglet's original (my changes are usually merged back in) https://github.com/hoglet67/RGBtoHDMI/tree/dev (All the current work is in …

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-01, 21:54

by

by IanB

in Marvin \ Video

in Marvin \ Video

These captures show a couple of the menus: main menu.png geometry.png It's still a work in progress but I don't have any original MDA CGA or EGA cards, just a couple of 'universal' cards that can be switched to all resolutions with DIP switches so maybe someone would like to help out with testing …

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Re: MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-01, 21:54

by

by IanB

in Marvin \ Video

in Marvin \ Video

I've just started working on NTSC artifact colours: Filename cgaartifactmaniac.png File size 18.75 KiB Views 8025 views 640x200 60Hz ega: Filename egamaniac.png File size 16.08 KiB Views 8025 views EGA text 640x350 60Hz: Filename egatext.png File size 21.64 KiB Views 8025 views CGA 640x200 60Hz: …

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MDA/CGA/EGA/VGA to HDMI using Raspberry Pi Zero

Posted on 2019-04-01, 21:53

by

by IanB

in Marvin \ Video

in Marvin \ Video

I recently started contributing to an open source project first developed by hoglet on the stardot forums, to convert the TTL RGB outputs of the Acorn BBC micro and Electron to HDMI / DVI using a Raspberry Pi Zero and a small CPLD on a 'Hat' PCB. My initial contributions were to get deinterlacing …

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Re: Toshiba T5200 mods and upgrades

Posted on 2019-02-26, 22:11

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Have you, by any chance, modded / changed / dabbled in Toshiba T3200 as well? If so, how close are the insides to T3200SX? Enough to reuse, say, power supply or memory banks? Sorry I haven't looked at the T3200. I recently picked up a T3100e though to which I've added extra memory and compact flash …

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Re: Toshiba t5200 screen display stops after a few seconds

Posted on 2018-11-07, 19:05

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by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here are a few things that can stop the plasma display from working: There is a switch that blanks the display when the lid is closed and that might be faulty. (It's by the right hand cluster of LEDs when you remove the case top). Unless depressed, it will also stop the plasma from working when the …

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Re: Toshiba T5200 mods and upgrades

Posted on 2018-10-03, 22:26

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hey, Ian, I found out Amazon has the same Toshiba Lithium batteries that I pulled from my T5200, but I don't think it has the resistor (?) the CMOS battery had. I was thinking of getting one, since it's 3.6v vs the 2032's 3.0v, but don't know what the function of the resistor might be... It's to …

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Re: Toshiba T5200 mods and upgrades

Posted on 2018-10-03, 21:11

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It's great to see there is recent activity on this thread which Ian started ..but I can't help wishing Ian himself visited and commented .. I'd hate to think this thread was just a legacy.. I keep hoping he'll come back, both because I enjoyed his presence but also to get yet more advice lol. I am …

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Re: Toshiba T5200 mods and upgrades

Posted on 2018-04-26, 21:20

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by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This calls for another hardware mod by IanB! I have looked at this and it should be possible in one way or another. There are two microcontrollers used in AT or PS/2 keyboard communications, one in the keyboard to scan the keys and send the data stream and one on the motherboard to received the …

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Re: Toshiba T5200 mods and upgrades

Posted on 2018-04-23, 01:01

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hamby wrote: Mixed news, mostly good: update: just reseated the ethernet cable... didn't get the dhcp message... my win7 desktop finds it, thinks its the dos desktop. Works for me! Looks like you are getting there! Did the indirect fan have any effect on the CPU temperature?

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Re: Toshiba T5200 mods and upgrades

Posted on 2018-04-17, 12:24

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Mixed news, mostly bad. However, whenever I boot it, it gives me the CMOS error, bad battery, etc. F1, set cmos... finish boot... no problem. So I figured the 2032 button battery I got was bad. Is the coin cell installed the right way? (+ side uppermost). But then I noticed that if I turned it off …

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Re: Toshiba T5200 mods and upgrades

Posted on 2018-04-15, 17:51

by

by IanB

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Okay, I ground down the tit on the IDE cable, and in short, it now works. When I booted, my choices in the bios were 100mb drive or no drive. But, after it rebooted, it said the drive was found at 1F-something. Glad to hear you got it working. The setting in the BIOS is ignored, XTIDE always …

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