Re: Quake won't do 640x480
Posted on 2020-09-17, 04:21
on some old cards I had to run univbe.exe for svga modes to work in duke
Re: Street rod 2 adlib works only with disabled cache
Posted on 2020-09-12, 04:42
I tried 2 utilities icd/ice and atslow Unfortunately both programs just hang after saying disabling cache/slowing down system was worth a try, guess disabling in bios still does the job
Re: Repairing VIC-20 Motherboard Traces
Posted on 2020-09-11, 09:49
When I scraped the paint and corrosion off the top I was really surprised how much copper was left ! I had assumed that the trace was completely gone, but it looks like there's enough of it left that it might work. There are still some dark spots left (I think it's just a stain on the copper) that …
Re: Street rod 2 adlib works only with disabled cache
Posted on 2020-09-07, 22:39
Grzyb wrote on 2020-09-07, 14:31: There's some software to disable/enable CPU cache, eg. ICD.EXE/ICE.EXE So you can simply make a .BAT file... Thanks this will be really useful, ill look it up
Street rod 2 adlib works only with disabled cache
Posted on 2020-09-07, 11:06
on my 5x86 when I launch street rod 2 I get prompted for graphics, chose vga then it goes directly to the game with pc speaker. For those that know the game after the gfx menu there is a second menu for adlib/pc speaker. I found the info somwhere that in faster hw turning off turbo or cache fixes …
Re: x1.5 multiplier on 486 boards?
Posted on 2020-06-28, 01:40
I got a overdrive dx266 running at 80mhz 2x40fsb Ran ok but got really really hot after 15 mins of intensive gaming but those overdrive come with a tiny heatsink no fan
Re: which 486 cpu pin is connected/talks to the cmos
Posted on 2020-06-16, 05:20
I was looking at the theory how the signal gets to cmos. So it goes cpu - > north bridge - > south bridge - > cmos/bios (possibly through some invertors and buffers) I started looking very closely at both chipsets (north and south bridges) I noticed some green corrosion which camouflaged with the …
Re: Intel 486 DX4ODPR100 runs very hot
Posted on 2020-06-15, 05:00
looks good! good job
Re: which 486 cpu pin is connected/talks to the cmos
Posted on 2020-06-15, 04:47
I removed the keyboard connector, everything has right continuity and resistance under it. Checked voltages on the cmos chip, vcc pins have 5v. Also checked vcc on the chipset also has 5v vcc pins I need to inspect really good under the ram slots and keyboard controller again incase I missed some …
Re: Intel 486 DX4ODPR100 runs very hot
Posted on 2020-06-15, 04:30
yeah those overdrive cpus get very hot from my own experience, the heatsink is pretty small. Maybe for word-processing it is ok but I find that playing a highly demanding game like duke3d those over drives get too hot to touch. I would attach a fan, I never kept one in my system long term so didn't …
Re: cmos shutdown register read/write error
Posted on 2020-06-13, 09:46
yeah I was thiking to myself to take off the keyboard connector again, im testing it without the keyboard anyway since it doesn't even post anything on the screen, think I was a bit quick to reattach it after fixing the damage. I thing I did check the voltages on vcc or at least checked the vcc pins …
Re: which 486 cpu pin is connected/talks to the cmos
Posted on 2020-06-13, 03:40
Yes I see the source code you provided, I think its very relevant because irs accessing the cmos ram doesn't matter what its doing inside the ram. So under the assumption cmos read/write register error is a problem accessing the cmos ram its the same function - IO ports 0x70 and 0x71 Now I need to …
Re: which 486 cpu pin is connected/talks to the cmos
Posted on 2020-06-13, 03:04
For Ami bios this is what I can find for 10 beeps 10 Short Beeps Ten short beeps means that there has been a CMOS shutdown register read/write error In my case the 82C206 has cmos ram integrated. I get 10 beeps, no video, no other activity - cpu gets warm. There is not much information on google …
Re: which 486 cpu pin is connected/talks to the cmos
Posted on 2020-06-12, 23:25
As soon as I power on I get 1o beeps which is the cmos register read/write shutdown errror. The cmos is integrated into the opti f82c206q chip on this board https://i.ibb.co/fQwQqzX/IMG-20200410-153046.jpg Since I have a working copy of this motherboard this is what I have done first: 1. Verified …
Re: which 486 cpu pin is connected/talks to the cmos
Posted on 2020-06-12, 14:08
So would the cpu talk directly to the south/north chipsets? I am mainly getting the cmos register error but I have also experienced other random bios beep errors so I believed this link you describe through the system bus is broken somewhere yeah I have been troubleshooting quiet a bit already, I …
which 486 cpu pin is connected/talks to the cmos
Posted on 2020-06-12, 13:41
I am trying to find which pin on the 486 cpu socket is responsible to talking to the cmos and bios From my understanding as soon as power goes to the cpu the cpu interfaces with cmos register addresses. I am interested in finding the exact line this communication is done on. On the 486 pinouts on …
Re: Fast 486 vs entry Pentium
Posted on 2020-06-08, 10:37
I wanted to keep overclocking out. However, AMD actually produced a rare 5x86 - 150 P75+ version. So perhaps I could include that for completeness and simulate it by overclocking the 133 version as I don't have the chip. The best I could achieve at 150 Mhz was ~16.4 in Quake. It is even slightly …
Re: Fast 486 vs entry Pentium
Posted on 2020-06-08, 09:20
should do the 5x86 amd clocked to 160 that is rated equivalent to p90, I got 17~ fps in quake on 5x86 @ 160 but with all tight ram timings etc
Re: When something on a board goes 'pop!'...
Posted on 2020-06-08, 09:17
once I had a half burned tantalum cap that looked fine form the top, but could see a small charr mark from the side. Inspect all your tantalums from all angles, you never know
Re: Creating a bootable CompactFlash card. How to do it?
Posted on 2020-05-26, 08:57
I found you need to delete all partitions on the cf card through disk management, create new partition and format it to fat16 with disk management. Then boot dos 6.22 floppy with a vmware, mount the cf as the hard drive, fdisk it and format again through the vmware. Formatting it through my computer …
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