Terrible Fire Accelerators

[8 Bit Dreams]

Originally Posted by alenppc

Max I can do is 10 cm. Anything beyond goes from unreliable to no connection at all.

Alen, do You have microscope or magnyfuing glass? Check Your resistor networks, i am starting to suspect one of these has a bad solder point. I had similar issue with one of my cards, where it was unstable at higher frequencies, also i had lower (7.5Mip) speed. I was thinking, it's because i have used 15ns chips. After Steve told me, it has nothing to do with chip speed i started to investigate, and found out that one resistor in the resistor network (nearest to the RAM) wasn't soldered, fixing that maked this card rock solid, no fails, excellent working @51.8Mhz

also try to install pullups on motherboard and test with other power supply. Kickstart EProm should be 120ns max. 105ns's costs double the price, but have also small fail rate, where 150ns chips are quite often defective

[alenppc]

I am stable at 50 MHz now with the old firmware, no issues. But those resistor networks can be troublesome on occasion, you are right about that.

My EPROM is also 120ns and I will see about adding the resistor packs to the motherboard, although I guess if I can go without, it's better, since that helps me troubleshoot for other people who also don't have the resistor pack installed.

[8 Bit Dreams]

Originally Posted by alenppc

I am stable at 50 MHz now with the old firmware, no issues. But those resistor networks can be troublesome on occasion, you are right about that.

My EPROM is also 120ns and I will see about adding the resistor packs to the motherboard, although I guess if I can go without, it's better, since that helps me troubleshoot for other people who also don't have the resistor pack installed.

ok, let's try that way:
please program this firmware i use, and report, maybe we are talking about different firmwares

[alenppc]

That's the same firmware I am using

[8 Bit Dreams]

Originally Posted by alenppc

That's the same firmware I am using

oh..ok..but it's more stable than the latest, in my opinion

[alenppc]

Originally Posted by 8 Bit Dreams

oh..ok..but it's more stable that the latest, in my opinion

Yes, that's what I am saying too. The latest firmware (the rewritten one) doesn't even boot on my system. Just yellow-screens. The one you linked works fine.

[8 Bit Dreams]

Originally Posted by alenppc

Yes, that's what I am saying too. The latest firmware (the rewritten one) doesn't even boot on my system. Just yellow-screens. The one you linked works fine.

yellow screen without FPU installed is caused by too high resistence thru R3. In Your case R3 is 47k, this resistor drops VCC voltage too much, CPUSENSE signal goes low, and the system thinks there is an FPU present, and fails to boot. So if i understand correctly, there should be something in the range between 4k7 and 10k, i haven't tried these values yet, so it's not quaranteed to work

[Black68]

Originally Posted by alenppc

OK, I had some time tonight so I was able to get the rev2 to run at 50 mhz at last! It only works with the beta 50m firmware though (the one that requires the FPU), the new firmware just yellow-screens to hell and back. Still, pretty neat... The IDE now does 6.6 mb/sec :P

How you get that high IDE data rate? I only get about 1mb/sec

[8 Bit Dreams]

Same here, i have 1.5Mb/sec, it's depending from CF Cart i think, another way to speed it up - is to copy kickstart into RAM

[hooverphonique]

Originally Posted by 8 Bit Dreams

Same here, i have 1.5Mb/sec, it's depending from CF Cart i think, another way to speed it up - is to copy kickstart into RAM

Yes, it is highly dependent on if kickstart is in local ram or not.

[8 Bit Dreams]

Originally Posted by hooverphonique

Yes, it is highly dependent on if kickstart is in local ram or not.

it's not an option for me with 2Mb of fastRAM

[alenppc]

Yes, use CPU FASTROM. I built PeteAU's trapdoor expansion which gives me 1 MB Chip ram and 1.5 SLOW ram, so I can afford to lose 512K. The trade-off is worth it.

[AJCopland]

Where did people get the re-locator for the 68000 socket in A500?

EDIT: Specifically I mean like in this image http://www.amibay.com/attachment.php...8&d=1504447785

[scrappysphinx]

Hi all, i have one of the blank Rev 3 TF530 pcb's. I was planning to build it for my CDTV but i've not found any information on whether it will A fit or B work so thought i'd pop a question up and ask if anyone knows if i can use it with the CDTV?

Also, i have an 8mb ram expansion on the diagnostic port of my cdtv, if i get the TF530 working will the ram on it work alongside the 8mb or will i need to remove that?

Thanks

[plasmab]

Unlikely to work/fit in the CDTV. The RAM will definitely not work.


Sent from my iPhone using Tapatalk

[scrappysphinx]

Thanks for the reply. Not to worry, will look for an alternative solution

[alenppc]

Originally Posted by AJCopland

Where did people get the re-locator for the 68000 socket in A500?

EDIT: Specifically I mean like in this image http://www.amibay.com/attachment.php...8&d=1504447785

The gerbers are available on github and I had the one you see there built by DirtyPCBs.

[alenppc]

Originally Posted by plasmab

Unlikely to work/fit in the CDTV. The RAM will definitely not work.

Is ROM the issue on CDTV?

[AJCopland]

Great, thanks alenppc

[8 Bit Dreams]

Originally Posted by alenppc

Is ROM the issue on CDTV?

if you have scsi.device in rom - all fine, othervise You'll unable to boot from IDE
About 8Mb RAM:
it will not work, cause 2Mb onBoard ram on TF is configured as Zorro II, it will conflict with Your 8Mb..