Software-only OVERCLOCK for LC475, LC575, Quadra 605

[Oelmuvun]

Interesting - how have you connected into the edge connector? Or is that the problem?

Edit - to get video out is a challenge though. You could potentially find an LCPDS Video card, but that isn't easy. Its easier with the LC 580 board because you can pick up a video adapter that goes in the GIMO port for not too much money, but there isn't a GIMO port on the 575.

Yeah, lack of the chassis harness is the issue, I've been tempted to solder some ribbons to the board but I'd still rather not resort to that. I have harnesses(but no cases) for my LC630 and PM6500 at least, so it's not the highest of priorities.

Anyway, keep up the good work.

 

[Opualuan]

Have LC475, ready for anything to max it out. Got a 40mhz 040, Haven’t ordered the MC88xx replacement chipset yet, but got a lot of practice with hot air rework this weekend, I’m ready! Interested to try the latest SW. control strip is very cool.

 

[phipli]

Have LC475, ready for anything to max it out. Got a 40mhz 040, Haven’t ordered the MC88xx replacement chipset yet, but got a lot of practice with hot air rework this weekend, I’m ready! Interested to try the latest SW. control strip is very cool.

Evening @Opualuan

Do you have a PowerPC upgrade?

The current latest published version is available for download here : http://stuffandnonsense.elephantandchicken.co.uk/?p=2519

I'll try to remember to keep that version up to date.

 

[phipli]

To the thread more generally:

I've still not been able to get significant support with PowerPC elements of the future version. One person got in touch but unfortunately they answer one out of three questions and then go silent for multiple weeks. I've made so little progress I've not actually even sent them the updated version yet (it is well over a month, if not two since they first contacted me - I'm worried they thought "testing" meant just getting a copy of something before other people, unfortunately, since I don't have access to the hardware I actually do really need answers to a few questions to work out what register settings I should be using). I'm thinking that there are so few PowerPCs out there that it would probably be better for me to just disable the PowerPC specific elements. At that point all that we're gaining is a different UI, so perhaps it is best to just stick to the current version 0.5.2 and concentrate on other things.

Truth be told, the Control Strip version is my favorite version and that has none of the fancy features

 

[JDW]

One person got in touch but unfortunately they answer one out of three questions and then go silent for multiple weeks.

Welcome to the club!

Whether it be in this hobby or at my day job, I find that once I ask more than one very specific and pointed question, the other person often gets overwhelmed. Then I need to play the follow-up game, which is a rather precarious game because if you follow-up too much, then the other person feels they are being hassled, further driving them into silence. But in the end, I find that persistence does pay off, even if a few feathers are inevitably ruffled in the process. Okay, well... maybe not in the case of my SE Reloaded Giveaway, where the winner still hasn't started the build yet after multiple follow-ups from me, but "you can't win 'em all."

As we say in Japan: 頑張ってくださいね！

Thank you for having made this overclock possible in the first place. You absolutely DO NOT get enough credit for your work on that control panel and extension and control strip module. But don't lose heart. Some of us really do thing your work is awesome. That's why I started this thread. More people need to know about the great things brilliant folk like yourself in this hobby bring to the table.

 

[phipli]

Whether it be in this hobby or at my day job, I find that once I ask more than one very specific and pointed question, the other person often gets overwhelmed. Then I need to play the follow-up game, which is a rather precarious game because if you follow-up too much, then the other person feels they are being hassled, further driving them into silence. But in the end, I find that persistence does pay off, even if a few feathers are inevitably ruffled in the process. Okay, well... maybe not in the case of my SE Reloaded Giveaway, where the winner still hasn't started the build yet after multiple follow-ups from me, but "you can't win 'em all."

At the end of the day, people in the hobby, I can't really complain. People have free will and no obligations. Work stuff, if it matters, either they need to be reminded why it has to happen and be given a deadline and milestones, otherwise it is getting reallocated to someone else. I've had it happen... I've been very frustrated, I've worked late having to do the stuff I asked someone to help me with... I'm sure we've all been there. Truth be told I've had more issues with managers allocated promised people to other projects between me bidding and winning work. With time you learn who you can trust and who you can't, and you earn emergency help credits by helping others so they are more willing to help you when the excrement hits the impeller.

 

[Byte Knight]

Cool project! I've got a Quadra 605 logic board in my LC III running a 68040 @ 40 MHz. Would this give me any speed boost on top of what I've already got?

 

[phipli]

Cool project! I've got a Quadra 605 logic board in my LC III running a 68040 @ 40 MHz. Would this give me any speed boost on top of what I've already got?

I've been able to run my 475 at up to 52MHz, but if you're already running at 40MHz I assume you have disconnected one of the pins on the 88920 and injected an external clock, or have a modified ROM? I'd need to know what exactly you've done to your machine to be able to answer for your specific case.

 

[Byte Knight]

I've been able to run my 475 at up to 52MHz, but if you're already running at 40MHz I assume you have disconnected one of the pins on the 88920 and injected an external clock, or have a modified ROM? I'd need to know what exactly you've done to your machine to be able to answer for your specific case.

I recall doing a resistor mod, but none of the mods that you're describing. Maybe it's really only running at 33 MHz...

 

[JDW]

Maybe it's really only running at 33 MHz...

Grab Download #4 and give Clockometer a try:

https://macintoshgarden.org/apps/newer-technology-disk

 

[phipli]

I recall doing a resistor mod, but none of the mods that you're describing. Maybe it's really only running at 33 MHz...

Yeah, if you just moved resistors, you wont be running at 40MHz. Electrically the computer has a 40MHz setting on the resistors, but there isn't a ROM entry, so the computer just doesn't boot. It doesn't even chime. I suspect you're running at 33MHz.

Like @JDW says, Clockometer will tell you.

 

[Byte Knight]

Yeah, if you just moved resistors, you wont be running at 40MHz. Electrically the computer has a 40MHz setting on the resistors, but there isn't a ROM entry, so the computer just doesn't boot. It doesn't even chime. I suspect you're running at 33MHz.

Like @JDW says, Clockometer will tell you.

Yeah, I was running at 33 MHz. Just installed the Software Overclock and the most I can get it up to is 37 MHz according to Clockometer, even when setting the control panel up to 50 MHz.

 

[phipli]

Yeah, I was running at 33 MHz. Just installed the Software Overclock and the most I can get it up to is 37 MHz according to Clockometer, even when setting the control panel up to 50 MHz.

Yeah, that sounds like you're hitting your head on the speed limits due to the MC88920. It seems to be the first limit you bump your head on if you're not limited by the CPU.

 

[Opualuan]

No ppc upgrade, keeping it 68k. I’ll give the new version a try. I have a few other logic boards I can test with.