Got a photo of the resultant product?

Have you seen this video ?
https://youtu.be/LI1_RlVLhu8

feipoa wrote on 2021-08-09, 05:55:

Got a photo of the resultant product?

My one assembled prototype is inside my system, so here's a picture of the raw PCB. It mounts to a standard keystone brand slot bracket

Do you have a photo of the interface cable that goes from this PCB to the DIP socket on the motherboard?

No, it's just a 24 pin ribbon cable with DIP24 IDC connectors on either end. Imagine a 8088 to 286 accelerator card's CPU cable

I can already envision what it looks like, however my purpose for the question was the hope that you would provide a photo of the finished product and interface cable to inspire others who might want to follow suit. I do not have this motherboard, so it wouldn't be for me, but for those who stumble upon this post who want to do something similar.

maxtherabbit wrote on 2021-08-09, 03:04:

Zerthimon - how's your desoldering chops?

Pretty good, why ? Is it about removing the via keyboard controller and replacing it with your board ?

Zerthimon wrote on 2021-08-10, 10:27:

maxtherabbit wrote on 2021-08-09, 03:04:

Zerthimon - how's your desoldering chops?

Pretty good, why ? Is it about removing the via keyboard controller and replacing it with your board ?

Yes - the procedure is to desolder the DIP-24 Via KBC and replace it with a DIP-24 socket

Then you make a length of 24c ribbon cable with the DIP-24 IDC connectors on both ends, plug one end into your fresh socket and the other into the mod board. You also need to grab IRQ 12 from somewhere on the board, there is a via nearby.

I can share the gerber files with you if you're interested in assembling your own mod board, or I could make you one and sell it- I have exactly enough components (DIP-40 KBC notwithstanding) to make one more

Ah, thanks for the offer! I can make one myself having the gerber files, but first I wanna be sure I really wanna do it (as a matter of fact that it requires extensive modification of the original mobo). I let you know if I'm interested.

I wouldn't exactly call socketing one single IC extensive modification, but it's up to you! You can always put the original KBC back in the socket if you decide to revert. I'm attaching the gerbers to this post

Thanks!

Hello.

First of all, apologies for reviving this dead post.

I just wanted to thank our fellow member, genial, for all the instructions provided.

Thanks to him, I have taken the liberty of making some minor adjustments, as my goal was never quite so extreme.

I have managed to enable the 512KB cache pins on my motherboard—a variation of the standard Lucky Star LS-486E (mine is a Lucky Star 4S-1A Funworld Barry)—and added the new chips to their sockets.

Now I have the PC I wish I’d had back when these machines were mainstream!

486lover wrote on 2026-02-17, 23:59:

Hello. […]
Show full quote

Hello.

First of all, apologies for reviving this dead post.

I just wanted to thank our fellow member, genial, for all the instructions provided.

Thanks to him, I have taken the liberty of making some minor adjustments, as my goal was never quite so extreme.

I have managed to enable the 512KB cache pins on my motherboard—a variation of the standard Lucky Star LS-486E (mine is a Lucky Star 4S-1A Funworld Barry)—and added the new chips to their sockets.

Now I have the PC I wish I’d had back when these machines were mainstream!

This means you can now install 128MB RAM and it will be fully cacheable?
You have my respect!

Back in 1994 I had a Gateway2000 PC bought as a gift from my parents
1. i486 DX2/66,
2. mainboard with isa and pci slots, whose name I don't remember,
3. Cirrus Logic 1MB PCI graphics card,
4. 540 MB HDD Western Digital,
5. no CDROM, as they were expensive,
6. 3.5" Floppy drive,
7. no Sound Card, as I had no pocket money to buy it
8. 15" CRT Sony Trinitron (this was the woow component of the entire PC)
9. AT Big Tower
10. Mouse and Keyboard
11. MSDOS 6.22, WfW 3.11, MS Office 4.3 professional

eliot_new wrote on 2026-03-03, 20:04:

This means you can now install 128MB RAM and it will be fully cacheable? You have my respect! […]
Show full quote

486lover wrote on 2026-02-17, 23:59:

Hello. […]
Show full quote

Hello.

First of all, apologies for reviving this dead post.

I just wanted to thank our fellow member, genial, for all the instructions provided.

Thanks to him, I have taken the liberty of making some minor adjustments, as my goal was never quite so extreme.

I have managed to enable the 512KB cache pins on my motherboard—a variation of the standard Lucky Star LS-486E (mine is a Lucky Star 4S-1A Funworld Barry)—and added the new chips to their sockets.

Now I have the PC I wish I’d had back when these machines were mainstream!

This means you can now install 128MB RAM and it will be fully cacheable?
You have my respect!

Back in 1994 I had a Gateway2000 PC bought as a gift from my parents
1. i486 DX2/66,
2. mainboard with isa and pci slots, whose name I don't remember,
3. Cirrus Logic 1MB PCI graphics card,
4. 540 MB HDD Western Digital,
5. no CDROM, as they were expensive,
6. 3.5" Floppy drive,
7. no Sound Card, as I had no pocket money to buy it
8. 15" CRT Sony Trinitron (this was the woow component of the entire PC)
9. AT Big Tower
10. Mouse and Keyboard
11. MSDOS 6.22, WfW 3.11, MS Office 4.3 professional

Indeed, although the current maximum I have installed is 64 MB, which is lightning fast for Windows 95.

Thanks for your interest 😍

Back in the day, I had a DX2/66 like yours with a Sound Blaster Vibra 16, a Trident graphics card via ISA port, a CD-ROM, and I seem to recall it having 16 MB of FPM RAM with Windows 95.

Well, saying I "had" it doesn't quite do the truth justice. It actually belonged to my aunt, but she ended up giving it to me later on.

My current idea was to build the Intel 486 in an identical case, but in what would be its enthusiast or top-of-the-line version.

So now I have a DX4-100 MHz (write back), 64 MB of EDO RAM, an 8 GB HDD (SD to IDE adapter), a Sound Blaster 16, and a Cirrus Logic CL GD-5446 graphics card with 2 MB of VRAM running Windows 95 OSR 2.5.

OT: why are the prices for 486 mainboards that high? I mean it is cheapter to buy an ALi5 Super Socket 7 mainboard with AMD K6-3 and throttle it to 486 speed, than buying a 486 board with (let say) AMD 5x86 P75. What is so special about the 486 boards?

eliot_new wrote on 2026-03-09, 12:48:

OT: why are the prices for 486 mainboards that high? I mean it is cheapter to buy an ALi5 Super Socket 7 mainboard with AMD K6-3 and throttle it to 486 speed, than buying a 486 board with (let say) AMD 5x86 P75. What is so special about the 486 boards?

Nostalgia + demand

I bought three with broken tracks and restored them.