Re: Register settings for various CPUs
Posted on Yesterday, 09:27
Try a different CPU, try a different motherboard model, and try the Evergreen utility.
Re: Register settings for various CPUs
Posted on Yesterday, 08:03
I've not run into this problem. I suggest sharing a screenshot. You also may want to try the Evergreen utility to set the registers and the IBM 5x86 utility. There's also a Free5x86 utility packaged in the original post.
Re: Success: Adding a PS/2 mouse port to the Shuttle HOT433 (using a dedicated keyboard controller chip)
Posted on 2025-04-16, 12:57
Has anyone has tried this mod on the v4 boards yet? The layout for the strapping resistors looks identical to v1-3 boards.
Re: Lets make new M919 Cache sticks?
Posted on 2025-04-16, 12:49
I think I’m going to try different memory chips. Will try these next https://au.mouser.com/ProductDetail/Renesas-Electronics/71V124SA10TYG8?qs=GVScuG1d83gM2mgZp%252Bu1Lg%3D%3D I’m also going to use a heat plate at 260c and solder paste to reduce the time it takes to solder every single leg of the …
Re: Register settings for various CPUs
Posted on 2025-04-16, 10:28
If I'm remembering things correctly, sometimes changing the Fast Gate A20 Enable/Disable option in the BIOS will also clear that himem error.
Re: Register settings for various CPUs
Posted on 2025-04-16, 07:25
-x0,64 may be needed, as suggested by rasz_pl. I think he suggested it for some A20 failures. Remark from me: I also had himem.sys a20 control issue with the ti486. I could resolve it by adding "/machine:13" option. You got your SXLC2-G50 working completely now? How did you land upon /machine:13? …
Re: PcChips M919 - voltage modification the easy way
Posted on 2025-04-11, 20:59
I was also noticing that TSOP's tend to perform the best when overclocking old 486 systems.
Re: PcChips M919 - voltage modification the easy way
Posted on 2025-04-09, 01:12
bertrammatrix, you should have your 64 MD modules now. Would you be willing to upload a photo of the module and identify which IC's are on the PCB? Thanks.
Re: Success: Adding a PS/2 mouse port to the Shuttle HOT433 (using a dedicated keyboard controller chip)
Posted on 2025-04-05, 13:07
I finally got around to modding one of my HOT-433 v1-3 boards for PS/2 mouse support. Everything worked just fine. Thanks to mkarcher for taking the time to figuring this out. I bent out pin 2 per the suggestion. VIA KBC works fine. I also tested the original Shuttle HOT-433 WINBIOS version 433AUS26 …
Re: PcChips M919 - voltage modification the easy way
Posted on 2025-04-03, 06:18
After some back and forth, it appears that this sell does not have the 64 MB, single-sided, 3.3v VRM, EDO modules with K4E640412D-TC50. For Samsung, they only have: KM44V16104BS-6. I will be interested to hear what modules you actually receive.
Re: Necessity of TCK, TDI, TDO, TMS pins on Am5x86 and Cx5x86 CPUs?
Posted on 2025-04-01, 03:11
I have a few bare interposers which are wired for Cx5x86 and Am5x86 already. I found the copper coloured interposer before I found the bare 5x86 interposers. Since the Cyrix 486DX2V80 on the copper interposer wasn't working, I thought I could re-purpose the interposer as there's no other use for it. …
Re: Necessity of TCK, TDI, TDO, TMS pins on Am5x86 and Cx5x86 CPUs?
Posted on 2025-03-31, 20:44
The adaptor originally had a Cyrix 486DX2V (low voltage), which according to the table in the above linked URL, should have required less bodges. While the interposer looks like it was intended for Cyrix 486DX/DX2 5V, maybe it was hoped to also work with the low voltage variant and someone soldered …
Re: Necessity of TCK, TDI, TDO, TMS pins on Am5x86 and Cx5x86 CPUs?
Posted on 2025-03-31, 08:29
Thanks for the caution. Yes, looks like Cx486DX standard pinout. I cross referenced name differences between Am5x86 and Cx486DX and think I've finished my analysis. I think adapting this adaptor for Am5x86 may be a bit involved. Parenthesis () indicate the Am5x86 naming convention. PGA and QFP grid …
Re: ECS Elite UM8810PAIO REV:2.1
Posted on 2025-03-31, 06:02
That's a nice looking PCB. If one of these MB's ever lands in my lap, I'll probably assemble the PCB.
Re: Necessity of TCK, TDI, TDO, TMS pins on Am5x86 and Cx5x86 CPUs?
Posted on 2025-03-31, 04:00
That's an excellent all-in-one PGA168 comparison of pin assignments for various CPUs. I will be sure to look through it in detail before I alter this QFP208-PGA168 interposer. So far, my observations are as follows: PGA R17 (CLKMUL) -----> QFP 96 (N/C) QFP 11 (CLKMUL) -----> No trace PGA B13 (WB/WT' …
Re: PcChips M919 - voltage modification the easy way
Posted on 2025-03-31, 03:50
Your comment concerning the existence of a 64 MB module, with the same IC's sparked me to message the seller as well. I have asked for a photo. I want to ensure that they are the same 50 ns 3.3 V Samsung TSOP chips. It was probably me who pointed out that FPM increases performance speed on many 486 …
Re: Necessity of TCK, TDI, TDO, TMS pins on Am5x86 and Cx5x86 CPUs?
Posted on 2025-03-29, 02:56
I don't know. I didn't emulate the circuit. What circuit? Also, I'm not familiar with the lawsuit details. I just see these 4 pins on, both, Cyrix and AMD's 5x86 datasheets.
Necessity of TCK, TDI, TDO, TMS pins on Am5x86 and Cx5x86 CPUs?
Posted on 2025-03-29, 01:56
Does anyone know if TCK, TDI, TDO, and TMS are required for Cyrix 5x86 or AMD Am5x86? I have a QFP-to-PGA interposer which contained a defective Cyrix DX2-80 and I want to re-purpose the interposer. However, I noticed that TCK, TDI, TDO, and TMS are not wired. I was hoping not to jumper these 4 pins …
Re: PcChips M919 - voltage modification the easy way
Posted on 2025-03-28, 20:58
Interesting, so the 64 MB modules have the exact same 50 ns IC's? Did the seller send a photo?
Re: ECS Elite UM8810PAIO REV:2.1
Posted on 2025-03-28, 09:19
Nice work. Are there gerber's hosted somewhere? I've never seen a clip pressing down on the voltage regulator IC like this. How is the clip attached to the PCB and where did you source it? I assume you are using it to press the PQ30RV21 onto the heatsink for cooling purposes? I think you could also …
Page 1 of 505