Re: 30 pin SIMM parity/non-parity ?

Posted on 2018-05-05, 20:05

by

by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thge parity bit is written by the RAM controller, as the XOR of the other bits, and is read back expecting the same, so if the RAM module had a circuit to generate it on read, it could spoof parity. Was it always calculated the same way ? I mean, was it in some specification ? (I can't seem to find …

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Re: 30 pin SIMM parity/non-parity ?

Posted on 2018-05-04, 10:18

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Matth79 wrote: The other way might be, with fast enough logic, a fake parity circuit Isnt the problem that the parity is made from, and build by, the RAM-controller, not the RAM itself ? By calculating it, there would be parity errors on all systems with "another parity model" so to speak.

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Re: 30 pin SIMM parity/non-parity ?

Posted on 2018-05-02, 08:41

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

This depends on your soldering ability and if you kill an IC/chip with the heat... i've been soldering for years and still I can make mistakes. They are fine, this isn't my first soldering job :) Generally all PC systems use parity, it is other systems like Apple which does not. In any case, why do …

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30 pin SIMM parity/non-parity ?

Posted on 2018-05-01, 21:09

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Im looking into a small side-project making a few 30 pin simms. IM not an electrical engineer, but its a simple board, with very little that can go wrong. I have been looking through the 30 pin SIMM specs, and I noticed the three parity lines. I then got out all my 30 pin simms, and I couldn't find …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2018-04-25, 18:32

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by rocksolid_1997

in Marvin \ Sound

in Marvin \ Sound

"Peasants" has nothing to do with it, you're simply late. Ah right - however the link provided prior does mention that there might be an anti-scammer part of it, that was what i was referring to entirely :) No pun intended in any wording, its all kindly meant :) Its an awesome board - awesome …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2018-04-22, 22:32

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by rocksolid_1997

in Marvin \ Sound

in Marvin \ Sound

640K!enough wrote: To summarise: no, not at the moment. A more detailed reply can be found here. Thanks for the reply - I completely understand, and I agree completely with the decision btw. I will keep my fingers crossed, that somehow us peasants can get our hands on one , at some point 😀

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Re: Boot Manager + LS120 ?

Posted on 2018-04-22, 19:45

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by rocksolid_1997

in Marvin \ Software

in Marvin \ Software

yearh, sorry, i should have mentioned; its not a fancy LS120, just a "regular" IDE drive one, for desktops. I do know about "the others", or atleast the USB/Parallel ones, but I never used them. I am in -love- with that eject mechanism :) Alas my motherboard has no support for it, so I am looking …

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Re: Boot Manager + LS120 ?

Posted on 2018-04-22, 18:15

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by rocksolid_1997

in Marvin \ Software

in Marvin \ Software

It has been a long time since I used either LS120 or System Commander but I did use them a lot back in the day. As I recall for LS120 drives of the type that use the 34-p floppy interface (instead of 40-p IDE) the system treats them like Drive-A floppies. In other words "Boot on Floppy" will boot …

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Re: Newly made Gravis Ultrasound compatible cards ... what's the degree of interest?

Posted on 2018-04-22, 16:05

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by rocksolid_1997

in Marvin \ Sound

in Marvin \ Sound

I am really late to this party; are there any way to get in on this still ? (buy pcb + components?) Edit: almost forgot; FREAKING AWESOME THREAD!

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Boot Manager + LS120 ?

Posted on 2018-04-22, 15:41

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by rocksolid_1997

in Marvin \ Software

in Marvin \ Software

As the topic suggests; I am looking for a BootManager that has support for (also) booting on LS120. Currently I have tested Plop Boot Manager, but it seems that it doesn't support booting off an LS120. Or that it, it might support it, but I would apparently need to know the partition configuration …

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Re: 1.44 floppy problem in DOS 6.22

Posted on 2018-04-16, 17:24

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Gona wrote: I'm usually hack the Dallas RTC to use a CR2032 coin battery or if it has award bios in eprom chip, I modbin it to change the 1.2MB floppy drive to 1.44MB drive. I was thinking of performing this hack, but im still looking for a good resource describing the process. Know any?

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-12, 11:33

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I stand corrected. How funny is this? My own socket 7 board has the BIOS suport to boot from LS120/ZIP Drives!.. :lol: I just came home from work and checked my Pentium MMX rig, and see that (in contrast to official manual) it has "boot from LS120/ZIP" option. Appearently the BIOS I have is a more …

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-12, 07:35

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Thanks for all the input, it has given me food for thought 😀 First order of business must be to find a proper ATX motherboard with as many of the needed features; then after that I will look into the ethernet-solution you proposed 😀

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-10, 14:31

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Not much (limited to loading packet drivers and playing Doom/DoomII), but I know it's certainly doable (not just IPX/SPX but TCP/IP, too). There was a sofware called "MS Network Client for DOS" and I know there are plenty of resources about how to set it up. Also unloading? Bc I seem to recall it …

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-10, 13:31

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

You found it: its called a KVM Switch :lol: Haha no not that kind of switching :D Physical actual, switching between two workstations with my body :) ... but if you can find me a cheap KVM switch which i can control inside a program on my main windows (Takes VGA in, PS2/USB out - transfer it via …

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-10, 13:07

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@PCBonez: For the task at hand its not a necessity to have LS120, for me its purely "a nice to have". its one of the things that for me, gives the machine value. I have LS120 in several of my machines. I have that, because its nostalgic for me; i was really proud to finally get "something special" …

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-10, 12:51

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Oh that Asus TXP4-X looks nice.. I could go for 4 PCI and only 2 or 3 ISA however, but the txp4 is really nice. yearh, with the Usb i actually did mean actual drives, but just as I posted it I thought it was a brainfart; it would, as you say, take up the memory that I specially do not want to take …

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-10, 11:53

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

It doesn't have to be AT - can be ATX :-) im not picky ! Do you know if DOS legacy USB support can handle removable drives ? Ive never done it - it wasn't relevant when i had the hardware, and then well.. windows came along. I loved (and love) my LS120 :-) Booting on LS120 means it can boot floppy …

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Re: Help me prioritize Socket 7 Motherboards

Posted on 2018-04-09, 22:27

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Yes the a,c,cdrom issue can be fixed with a bootmanager.

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Help me prioritize Socket 7 Motherboards

Posted on 2018-04-09, 21:48

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by rocksolid_1997

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Hi Vogonians ! I am building a Socket 7 machine - for a P133. Now, the purpose of this machine is mainly to be a development machine, for maybe, if possible democompos. Assembly 2017 set (some) of the standards for PC's - and Im trying to make a replica machine to do some testing of my old code. So, …

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