Re: Lowest profile ISA IDE card?
Posted on 2023-12-13, 19:45
Yeah, my original measurement is about right.
Re: Lowest profile ISA IDE card?
Posted on 2023-12-13, 17:47
I have a similar/identical ISA riser and from the mainboard up to the top of the second isa slot (cutting off the top three isa slots) I measure about 45mm. I think all of the soundcards would fit ( aside from the pci one since you only have isa slots ). I may be remembering the available space NOT …
Re: Lowest profile ISA IDE card?
Posted on 2023-12-13, 17:13
The tandy nano seems to be a little less than 30mm high, not including the isa connector. the other isa card on the archive seems to be about the size of a D15 game port connector which is... a little less than 40mm, not including the audio jacks. the pci card seems to be around the 30mm as well. …
Re: Lowest profile ISA IDE card?
Posted on 2023-12-13, 16:54
Thanks. Those are pretty low, but not low enough for this case unfortunately. PCI had some impressively low cards I've found but nothing quite like those in ISA that I've come across, although I just found the Tandy Nano . I might have to do some measuring to see if it could fit. https://i.ytimg.com …
Re: Lowest profile ISA IDE card?
Posted on 2023-12-13, 16:05
Have you seen this thread? https://www.vogons.org/viewtopic.php?f=46&t=82499 No, I hadn't but that looks to be about a perfect option for getting XTIDE if I needed to. It even looks like things could be pushed together a bit more vertically to take even less height. The shortest ISA VGA card that …
Re: Lowest profile ISA IDE card?
Posted on 2023-12-12, 22:29
Booting from them needs either modification to Primary Master or using something like XTIDE Universal BIOS. It can boot from all IDE ports, as far as I know. Edit: Here's an old photo of my Tower AT w/ the IDE host adapter and a DOM. XTIDE is in the EPROM that's installed on the NIC next to it. …
Re: Lowest profile ISA IDE card?
Posted on 2023-12-11, 23:02
This is an outgrowth of a project where I am writing a Gameboy emulator that uses a bunch of tricks and should be able to run full speed on a fast 286. (I've previously mentioned the project here .) Putting the test computer for this emulator in a Nintendo case is thematic and because of the goals a …
Re: Lowest profile ISA IDE card?
Posted on 2023-12-11, 22:22
The motherboard is an unknown model of 286, but it is very small for a 286. It has six 16-bit ISA slots and one 8-bit slot. The case, well you might recognize it: https://i.imgur.com/yrpja29.jpg NOTE that the riser card is just a random aftermarket one--it didn't come with the motherboard, but it …
Re: Lowest profile ISA IDE card?
Posted on 2023-12-11, 18:53
The issue with that is I've got limited horizontal space available too. I plan to use right angle risers for (low profile) video and sound cards which leaves me just a tiny amount of space for the last card I need for the project, IDE. But overall the 3 cards are interchangeable and if I could find …
Lowest profile ISA IDE card?
Posted on 2023-12-11, 18:03
I have a project that's got very little vertical clearance over a motherboard. I'm looking for the lowest height ISA IDE card I can find. Something like this would be perfect: https://computer-retro.de/Bilder/Multi-IO/Microflex-UTC-3001I-ATF20V8B-ISA-IDE-Controller.jpg ...except I need to be able to …
Re: Legit Harris 25MHz?
Posted on 2023-12-04, 14:57
I bought three of these supposed 25mhz harris cpus from the same ebay seller (the one using the blue cloth as a background on the picture). Two of the three had bent pins when they arrived and (after straightening the contacts and testing) all three were DOA. EDIT: and FWIW, after contacting the …
Re: Powering old motherboards with 5V only?
Posted on 2023-11-20, 15:32
Thanks for the replies. I'll give it a shot and will be sure to hook up power good. If possible you might wanna stick a 10 kilohm to ground on the 12V to avoid anything that reads it or references it going into "undefined" state, i.e. putting spurious bits on a bus somewhere. Floaty pins are best …
Powering old motherboards with 5V only?
Posted on 2023-11-17, 20:27
Looking at the major chips on a 286 motherboard I have beside me, I haven't found anything that looks like it needs voltages other than 5V. With a careful selection of surrounding components, do you think it possible to boot and use such a system with 5V only? Can anyone think of any way there would …
Re: PC CHIPS/FOXCON M396F ver. 2.6
Posted on 2023-11-08, 22:01
OK, thank you. For future people who might visit this thread, I have a sneaking suspicion that all of the chipsets mentioned by the OP and me above might just be Headland HT21 chips, for which datasheets are readily available. Some of the reason for believing this is the same revision of the …
Re: PC CHIPS/FOXCON M396F ver. 2.6
Posted on 2023-11-08, 17:39
Do any of you have the datasheet for the SARC chipset? Or any closely related one (such as the SARC RC2016A8 / Toshiba TC6154AF / PCCHIPS Chip 2 / CDCOM, all of which appear to be the same)? I've been looking for it, but can't find one.
Re: Custom made, 50ns, FPM, Simm 30, memory modules with parity.
Posted on 2023-11-07, 22:40
Does anybody know if these are still available? I was hoping to order this as well as some other products from @galanopu from their website but am not sure if he/she is still active and selling products. Their (super interesting!) YouTube channel hasn't had an update for a bit so I'm a bit nervous …
Re: Volo's Gamepad to PS/2 Adapter. Device discussion (official thread) SOLD OUT (06.02.2023)
Posted on 2023-10-21, 16:39
Volo, just letting you know that I would definitely be interested in buying a couple of these when you are able to make more. Stay safe! And if other members here bought one and don't use it anymore, please PM me. I'll buy it from you for above your original cost.
Re: The myth of the vertical retrace interrupt on EGA/VGA
Posted on 2023-09-29, 14:32
Necroing this thread, but if you're still interested in some PS/2 testing, I have an MCGA Model 25 and a VGA Model 25 that I could dig out and test on. I'd expect the VGA to have a similar result to the Model 30 VGA mentioned above, but I guess it couldn't hurt to get confirmation on the behavior... …
Re: VGA custom character mode for Gameboy emulation
Posted on 2023-09-18, 14:31
That's perfectly possible. The text mode hardware of the EGA/VGA card works by having all character codes in plane 0 and all attribute codes in plane 1. (detailed response snipped) Controlling 4 pixels of 4 colors would be ideal for the 4-color (grayscale) gameboy! Can you point me to more …
Re: VGA custom character mode for Gameboy emulation
Posted on 2023-09-17, 15:13
For the 4-color issue, all I can think of are custom 8x8 textmode chars for 33%/66% dithered/filled in all possible 2x2 combinations per char for every 2x2 pixels of a GB buffer all on an extended text mode That might work, but I am hoping to avoid dithering to have a more authentic look. It would …
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