Amiga PC Bridgeboards...

  • Thread starter Thread starter furan-
  • Start date Start date
  • Replies Replies 73
  • Views Views 9512
I used the connector on the bottom of the viper-jet (not soldered but press-fit) press-fit on the same footprint with some leads, so I can float a cpu and attach it to a CPLD (well really an FPGA) and make it speak to a 486 (just to get better fpu).

YI1xPjs.png
 
I have a Vortex with a Cx486slc-20 and I would like to upgrade it to a 486slc2-50 do you know if the [FONT=&quot]TI486SXLC2[/FONT][FONT=Helvetica neue, Helvetica, Verdana, sans-serif]-G50-PQ or [/FONT][FONT=Helvetica neue, Helvetica, Verdana, sans-serif]the C[/FONT]x486slc2-50MP [FONT=Helvetica neue, Helvetica, Verdana, sans-serif]chip is a direct replacement to where I do not have to change any thing else or make any modifaction to where it is a replace and put the card back in and go. Any help on this..[/FONT]
 
The TI486SXLC-G50-PQ is a drop in replacement for the GoldenGate’s Cyrix CX486SLC. If you read back in this thread you can see that I successfully had my GG upgraded with this cpu

https://rover.ebay.com/rover/0/0/0?mpre=https://www.ebay.co.uk/ulk/itm/273391727285

the extra cache makes it a lot faster than the clock doubled Cyrix 486SLC2

The cache and clock doubling for the TI cpu is enabled by software in config.sys - I can send those to you if you do the upgrade.
 
Thank you, and yes if you can send me the need software to unlock it that would be great.. Will this chip also work on the A2386 board as well?
 
Hi,
Things have been pretty busy on my side, but I've got a bit of a more professional build now for the upgrade. It uses some rare parts so I'm not sure how easy it will be to reproduce.
 
@furan I’m still very keen to see how your project progresses!
 
Last edited:
Great Work!
For info, I looked back at my Speedstar64 and seems I have Rom v2.02
FullSizeRender 2.jpg
 
Last edited:
That should be ok, that is what I have used on my goldengate for several years now without issue. Use good cooling.

this quote from vogons:

TI486SXLC2-050 : This should be purely 5V part. The 40MHz version is readily available. I haven't seen too many 50MHz parts though.

TI486SXLC2-G50 : This seems to be the most common version available. In the manual it is listed as a hybrid 3.3V/5V part. It is described as being 5V tolerant (I take that to mean 5V I/O with 3.3V core). However, the manual doesn't make it clear either way.
I saw photos from a guy online who sliced off the 386SX chip in his Sega PC, and soldered a G50 in place. I believe it worked, but who knows how long it will last if the core is really 3.3V.

TI486SXLC2-V50: This should be a purely 3.3V part. I think I've only really seen these on paper. I believe they use 3.3V I/O, which makes them pretty weird. Maybe they were used in laptops.

2B948F7A-7D5A-4180-91F9-642ACEFE0E22.png

https://www.vogons.org/viewtopic.php?t=34488&start=20
 

Attachments

  • 2B948F7A-7D5A-4180-91F9-642ACEFE0E22.png
    2B948F7A-7D5A-4180-91F9-642ACEFE0E22.png
    51.6 KB · Views: 18
Back
Top Bottom