Re: WD1003-WAH compatibility with 12.5mhz systems?
Posted on 2022-11-29, 04:49
I think the MFM card just can't keep up and your motherboard is perfectly fine
Re: XTIDE ROM - 3COM 3C509B-C
Posted on 2022-11-29, 04:42
Ok I stand corrected, the hardware is capable. However, the configuration utility does not expose this bank switching option to the user Right, but the point was the 3C509B drives the upper address lines rather than just tying them high and it only exposes a fixed 16K window regardless of the …
Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!
Posted on 2022-11-28, 15:32
I'll reply with photos later. In short, the issue with 200 mV ripple at low freq. (700-800 MHz) does not occur with the commercial product (Improve It 5V PGA168 to 5V PGA132 adaptor + another Gainbery voltage interposer) on the same testbed. There is also a measurable high freq. ripple at the FSB …
Re: Recommendations for reliable and noisy spinning HD?
Posted on 2022-11-28, 15:30
The Serpent Rider wrote on 2022-11-28, 15:10: HDD reliability after 20+ years is a pipe dream. The ~20 of them which I still have in active duty, error free, would disagree with you here
Re: XTIDE ROM - 3COM 3C509B-C
Posted on 2022-11-28, 15:27
The 3c509 does not allow you to pick which half (/quarter) of the ROM you use. If you choose a window smaller than the physical size of the chip you will always get the upper part of the data. The 3C509B (specified in thread title) does let you select the window. https://www.janwagemakers.be/ …
Re: WD1003-WAH compatibility with 12.5mhz systems?
Posted on 2022-11-28, 15:25
Jo22 wrote on 2022-11-28, 07:09: ISA was defined as a 8,33 MHz bus, that's completely right. The "Gang of Nine" did this is in 1988 or so, when EISA saw light of day. not really, IBM did that when they released the 8MHz AT, the 1988 spec was simply a formalization of an already well established …
Re: Recommendations for reliable and noisy spinning HD?
Posted on 2022-11-28, 04:24
Error 0x7CF wrote on 2022-11-28, 03:31: I remember Maxtor drives being remarkably noisy for how modern/large they were. Yeah I've a 2GB diamondmax with a pretty satisfying seek sound
Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!
Posted on 2022-11-27, 23:11
feipoa wrote on 2022-11-27, 22:26: The unit is functional, but I'm trying to get more MHz out of it I knew it LMAO Keeping poor sphere in the dark all along
Re: XTIDE ROM - 3COM 3C509B-C
Posted on 2022-11-27, 23:09
Oh, well IIRC you can configure the card to provide a 32kB window which would eliminate all this BS Depending on the card and the config program used you can pick which 16KB window of the ROM to use - obviously requires the card to control the high ROM address pins rather than just wiring them …
Re: XTIDE ROM - 3COM 3C509B-C
Posted on 2022-11-27, 20:05
What jmarsh is trying to say: It is possible that the 3com card doesn't show you the first half of the ROM chip, but the second half of the ROM chip. That's why you made the copy: To make sure the second half of the ROM chip also contains the correct data. The second half of the ROM chip starts at …
Re: XTIDE ROM - 3COM 3C509B-C
Posted on 2022-11-27, 19:56
I feel i selected the entire block of data selected file copy and the paste at 3fff0 i think it was. I program view it and yes there is a second code set further down. Regardless both methods yield the same result (filling with zeros) The first few bytes aren't there but present on the rom. What …
Re: Custom interposer module for TI486SXL2-66 PGA168 to PGA132 - HELP!
Posted on 2022-11-27, 19:54
that's pretty low frequency ripple, you should be good with some regular old 10uf bulk decoupling
Re: Troubleshooting faulty integrated floppy controller on AT clone motherboard
Posted on 2022-11-26, 13:49
How's your desoldering chops? You might want to socket and replace the 765
Re: Modified BIOSes for ASUS P3B-F, P3V4X, P3V133, CUBX and CUBX-E/L
Posted on 2022-11-25, 15:54
I may give modifying the BIOS myself a shot in the future. I have a few replacement BIOS chips on the way - will be doing some experiments with hot swaps, boot blocks, and replace this EPA Energy Star logo... I'll definitely bookmark this thread for its useful information! Have fun! In the meantime …
Re: New find, two ST412/ST506 mfm drives.
Posted on 2022-11-24, 22:54
I'll be happy to send the ebay link to the connectors via DM, but site rules prevent me from posting it openly. Search for "5 Pcs 20 Pin Card Edge Female IDC Connector for Flat Ribbon Cable" on ebay to see the ones I purchased to make my own MFM data cables two years ago.
Re: DOS C interface to asm function?
Posted on 2022-11-24, 22:51
Just write the function in C, then disassemble it, and you will be able to figure out which parameters go where from it. If not, then I question your ability to write the entire function in assembler in the first place. What? I know full well how to write x86 assembly but basically zero experience …
Re: New find, two ST412/ST506 mfm drives.
Posted on 2022-11-24, 15:00
Both the card edge and pin header connectors are IDC - Insulation Displacement Connector - that describes how they attach to the ribbon cable
Re: New find, two ST412/ST506 mfm drives.
Posted on 2022-11-22, 14:49
Yes the twist will be a problem. You can take the back of the card slot IDC connector off and untwist the cable easily enough. As for the data cable, I just bought 20 pin IDC connectors from ebay and made my own
Re: 512MB cacheable area on Intel 430HX mainboard with AMI BIOS?
Posted on 2022-11-19, 21:03
You can probably issue a command in DOS DEBUG to enter the SCSISelect and enable the ctrl-a prompt. That's how you do it on normal adaptec cards once you've disabled it
Re: 3 (+3 more) retro battle stations
Posted on 2022-11-19, 18:38
pshipkov wrote on 2022-11-19, 16:00: So, Max, are you able to run your 3x50 LS C1 system at tightest L2 cache timings now ? I already was, this purchase was for a different system
Page 35 of 169