Re: 486SocketBlaster

Posted on 2023-05-01, 21:54

by

by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I decided that I want to order a few of my own fork and I was just updating it a little bit. Improved the silkscreen a bit and changed the caps on the outside side to hopefully keep ripple down. I ran through the numbers and formulas on the dc-dc converters datasheet and the numbers are so small I …

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Re: 486SocketBlaster

Posted on 2023-05-01, 19:21

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thought I should just update this for the sake of completeness Here is video 3: https://youtu.be/CLPSJ0jOQsU

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Re: USB to Serial Mouse using the Pi Pico!

Posted on 2023-04-30, 02:36

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So here we have 4800 baud @ 7n2 (important because that's slower than 7n1) where we're getting 160hz and your average usb mouse caps out at 125hz. The adapter can take higher speed mouse, the image above was done with a logitech 502 hero set to 500hz. My adapter is running debug firmware with all …

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Re: USB to Serial Mouse using the Pi Pico!

Posted on 2023-04-29, 21:48

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

reupload of the intellipoint drivers since the zip didn't open for someone. Also, found another variant of the vmouse.vxd driver for win98se which is included in some updates that are not in the iso's But I can confirm that the modded drivers work for win98se, just winme left to confirm. IMG_ …

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Re: USB to Serial Mouse using the Pi Pico!

Posted on 2023-04-29, 01:51

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Here we go. Version one of the modded drivers. I haven't tested win98se and winme yet but they should work. The 19200 speed drivers should work with matze's ps/2 to serial adapter in high speed mode but I haven't tested that yet. Plan to though. Really not much point in going higher than 2400 baud …

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Re: USB to Serial Mouse using the Pi Pico!

Posted on 2023-04-27, 19:19

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hey everyone A fellow Vogons member named Darmok has contacted me with information on how to modify mouse drivers so win3.1 and 9X can support higher baud rates. I've been missing around with that information trying things out but thanks to several hardware issues there were delays. But using what …

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Re: USB to Serial Mouse using the Pi Pico!

Posted on 2023-04-27, 19:03

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello! Didn't realise there were so many projects for USB HID! The combo AT-serial is what I'm looking for. I'm using prebuild modules from aliexpres, all tuck together in a internal card. zzz.png So, I began with user 'No0ne' project, that uses a bi-directional level shifter for the AT/PS2. It …

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Re: How to troubleshoot floppy disk change problem

Posted on 2023-02-20, 20:59

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

which CF card are you using?

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Re: How to troubleshoot floppy disk change problem

Posted on 2023-02-19, 18:43

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

EDIT: pulling the disk change line to ground doesn't change the state of the register per debug. Curious. Now I would wonder if you force a pullup on pin34 to see if there is a change. For a pullup you would want to connect pin 34 through a 10k resistor and maybe a diode to 5v. It might seem a bit …

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Re: How to troubleshoot floppy disk change problem

Posted on 2023-02-18, 04:23

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I don't know much, I was just tinkering with a very similar topic recently. But as far as I know dos talks to the drive based on the bios settings, which is how some recovery/backup software lets you set the type of floppy disk yourself and ignore what the bios says. You could use CRTL+C to force …

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Auto Floppy Switch Board

Posted on 2023-02-06, 04:52

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hello there. This is a fork of Tech Tangents Floppy Switch Board, video about that here! Basically his board is a passive board to switch between two floppy drives and makes it work with some software magic. It made me wonder just what it would take to make the switching automatic in the sense then …

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Re: 486SocketBlaster

Posted on 2023-02-05, 19:03

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Very nice! :p It’s worth noting that there were a few different pins used for multipliers on the 486 socket platform. So your switch won’t apply to all cpus. I think you already know that though. You should note on the silk which pin that jumper is using. That’s one of the reasons my unit has so …

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Re: 486SocketBlaster

Posted on 2023-02-05, 02:33

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I took a go at adding the pot to the PCB. The layout of the PCB changed a bit based on feedback from the Retro Web. Github: https://github.com/LimeProgramming/486SocketBlaster/tree/4-layer-onboard-regulator/4-layer-kicad Rigo (previously known as cats) provided a lot of feedback and made their own …

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Re: 486SocketBlaster

Posted on 2023-01-19, 10:29

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Your schematics shows R2 as 40.2 ohm, not k. Confused me a little until I read the table below :) Ah, oops. Yeah it's 40.2k i always go into LCSc and look for common sizes so stock should be available. 40k worked math wise but far less stock of 40k so 40.2k it was. Still I'm pretty sure that should …

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Re: 486SocketBlaster

Posted on 2023-01-18, 13:22

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I took a go at making a circuit with limited range on the voltage. This is what I came up with and the over all resistance is still inline with the datasheet. There is some wiggle room for a slight over volt and under volt and you should need to turn the pit a good bit for a change in voltage so …

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Re: 486SocketBlaster

Posted on 2023-01-17, 23:51

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Well, you basically make a voltage divider on some regulators and it gives a reference voltage the trim pot would let you adjust that. Range would probably ideally be like 3.3 to 5-point something so that overclocking of 5v cpus can be accomplished. But this isn’t possible using onboard without …

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Re: 486SocketBlaster

Posted on 2023-01-17, 23:31

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was thinking there today An overclockers edition of this PCB that has a little pot to tune the voltage between a pretty narrow range so that the pot drifting a little shouldn't impact anything. I wonder if that can be done. IE: the pot is in parallel with another resistor and the two together set …

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Re: 486SocketBlaster

Posted on 2023-01-14, 19:27

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Add tweaks! :p Honestly since this is largely someone else's project I think it would be for them to set the feature set of this. I just felt like taking a stab at building in an onboard regulator to see how it goes. Going 4 layer made this PCB much easier to make and implement the tweaks as you …

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Re: 486SocketBlaster

Posted on 2023-01-14, 18:34

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I've updated my own PCB to a 4 layer design. It's pretty much the same just with vin and vout on their own layers and the top and bottom layers have the traces between pins mirrored, it should keep the people who are concerned about interference happy. I just felt like a trying a 4 layer PCB and …

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Re: Dummy PS/2 Keyboard Project

Posted on 2023-01-10, 22:42

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by CalamityLime

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I thought about making something like this before, but I really like your implementation. Well done

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