Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-11, 04:53

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The thing is, with the Pentium pro and processors after it, the l2 cache was on the cpu die. so they put the proper size tag ram on there and the whole issue became moot. Computers are SO easy to "build" today, just about any swinging dick can get one together and have it work. makes me sad …

---

Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-11, 04:23

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

on a side note, look at connector J11 on board #2. its right next to the bios. $5 says that's a external battery connection.

---

Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-11, 04:15

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

the thing with cache is that there is a 2nd set of memory called the TAG ram. This ram told the cpu what data was in the cache without acutally looking at the cache. This chip needs to be upgraded with the rest of the cache. a more detailed explanation can be found here: http://www.pcguide.com/ref/ …

---

Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-11, 00:19

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

most boards will charge it. I'd put 3 rechargable aaa's in a holder and forget about it. There is a way to prevent charging and all it takes is a diode and a bit of soldering, but imho its not worth it.

---

Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-11, 00:08

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

its 4.5v because non-rechargeable cells are 1.5V each. 3 1.5's = 4.5 RECHARGEABLE cells are typically 1.2V each. and total 3.6v. I wouldn't worry so much about the missing capacitor. it is likely just a filter cap for the voltage input. Having a quality power supply makes the caps on the motherboard …

---

Re: Sale at LittleWing Pinball

Posted on 2011-09-10, 15:01

by

by luckybob

in Milliways

in Milliways

oh sweet jesus... I played loony labyrinth to DEATH back on my father's 68030 mac... I'm shocked and happy that the company still exists!!!

---

Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-10, 05:40

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

For the 286-486 era board the bus speed is the same as the cpu speed. EXCEPT for the 2nd wave of 486 processors. 25,33,40,50 were the stock speeds. most people had a 33 or 25. 50's were EXPENSIVE as the board had to run at 50mhz and few could do this reliably. starting with the 486/66 they started …

---

Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-10, 05:13

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

neither board really light the world on fire for me. But if I was in your position I would use board #2. if board #1 has 32mb of ram you can put that into board #2 and have that and whatever is in the simm slots. From the picture, it looks like board #2 has a 33mhz processor, so its likely the …

---

Re: 486 restoration project : need some advices and opinions!

Posted on 2011-09-10, 04:32

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

imho that evergreen upgrade is worth more than anything else in that case. If it still works, post the autoexec.bat and config.sys files from the root of the hard drive. If there are any special utilities, that will tell us where/what they are. as for the corrosion, I'd personally take the board …

---

Re: Bought these (retro) hardware today

Posted on 2011-09-09, 17:22

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

thats a v30! wow! thats probably the FASTEST 8086/8088 compatible chip made. the NEC chips were cool because they had could emulate an 8080 so the "older" software could be ran as well. I don't know what you paid for it, but you have a real gem there!

---

Re: external cache woes

Posted on 2011-09-07, 06:40

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

say no to zombies! thanks shodan486... 🙁

---

Re: external cache woes

Posted on 2011-09-07, 00:43

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

UM61512AK-15 is a standard chip. 4 give you 256kb of cache and 8 give you 512. hence the 512 in the part number. as for the jumper settings, the first 256k option is for EIGHT chips TOTALING 256k. the 2nd is for 4x 512 chips for 256k. #3 would be EIGHT chips for a total of 512k and #4 would most …

---

Re: 486 motherboard

Posted on 2011-09-06, 05:58

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

in my personal experience, I would never pay any significant sum for a 486 board with hard-soldered cache. or bios chip.

---

Re: Bought these (retro) hardware today

Posted on 2011-09-02, 19:55

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

@robin4 thats REALLY cool AT board you have there! (XT had 5 slots) If you need more help there is a website that caters to the 8 bit systems: http://www.vintage-computer.com They are "serious" about their collecting. Hell, even mentioning 486's is considered taboo and Pentiums are right out. That …

---

Re: Dubble DIN keyboard connection???

Posted on 2011-09-01, 03:00

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I also want to know. Why does old motherboards has 2 biosses ( and mostly there are empty sockets near them) What are those empty sockets for? flash memory only had so much capacity. usually there were little windows that you can see inside the chip. These required a "blacklight" of sorts to erase …

---

Re: Dubble DIN keyboard connection???

Posted on 2011-08-31, 02:34

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

Clue #2 is the slots. there is only FIVE and they are spaced wider than "normal". Only the original XT has slots like that. But yea, floppies killed the cassette for data storage. On a side note, people have made a VHS data interface card, and it would backup your hard drive to a VHS. I've never …

---

Re: Bought these (retro) hardware today

Posted on 2011-08-25, 22:30

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

The LX has the exact same memory limitations as the BX btw ;) http://en.wikipedia.org/wiki/List_of_Intel_chipsets#Pentium_Pro.2FII.2FIII_chipsets actually no. 512mb of sd ram MAX. 1gb if you use EDO. :P I'm going to "try" to get around to testing this board but I have another project on the main …

---

Re: Anyone play Terraria?

Posted on 2011-08-25, 04:44

by

by luckybob

in Milliways

in Milliways

looks nice, but you should do it in minecraft.

---

Re: Bought these (retro) hardware today

Posted on 2011-08-24, 00:31

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

I was going to post that there was a complete eONE system on ebay for $25 ad $9 shipping, but it was only the keyboard. Misleading pictures make me want to kick my dog.

---

Re: Bought these (retro) hardware today

Posted on 2011-08-23, 07:43

by

by luckybob

in Marvin \ General Old Hardware

in Marvin \ General Old Hardware

So I was at the thrift store again this weekend, and I saw from the front of the store a blue Imac, on the shelf in the back. YAY! I thought to myself. However, it was NOT an Imac. Hell, it wasnt even an mac. I found for $12 a Imac CLONE, made by Emachines. The eOne. I got to play with it tonight, …

---