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Glad to hear you tested on the stock IIc monitor initially and found that no text or anything else appeared. That first test wouldn't have shorted anything. Of course, it could be a problem with that monitor, unless you tried feeding video to it, such as with the RCA video out of an old VHS or...

The 15-pin connector on the IIc is not monitor compatible. Something will short if connected directly to a monitor, which would explain the reaction by your IIc. The 15-pin plug was made for an RF Modulator (for an old TV) primarily, or adapters like the one that shipped with the old Apple LCD...

Thank you for confirming that the "moving, colorful artifacts" display last for 30 seconds and ONLY occurs when both the keyboard and drive are disconnected. So it seems you could put in a floppy and boot from it, but you simply get a black screen and don't know if it boots or not (other than...

@RickM I don't have hours to spend reviewing every design choice, but I did do a quick overview with the schematic you provided and the datasheet. I didn't spot anything obviously bad, but again, I've not pondered all the design choices made. I did take note of this table in the datasheet...

When you power on and wait, you only see what you show in your previous photo? Do the artifacts move, or is that image static? When you power on, do you hear the floppy drive heads move (it's loud, so you should)? Obviously, you must connect the drive to know.

I did not grow up using Apple II computers and therefore cannot tell you from personal experience what variations of the screen garbage there are. The test for that is super easy though -- just make time to connect your keyboard. If the artifacts vanish, then your previous photo will provide...

@eric In layman's terms, when would the cited "small number of users" of BlueSCSIv2 user experience the aforementioned "SDIO timeouts"? When using WIFI only? When performing specific tasks?

Not sure if there is an “exact pattern” but you can see at 4:55 a display pattern that the 8-bit Guy gets without a keyboard attached…

You could try to tap the Composite output pins on the 15-pin connector to see if that works… https://devonhubner.org/AppleIIc_Video_Port_Breakout/ More talk about it here: https://www.applefritter.com/content/apple-iic-video-output-15-pin-connector

Congrats, @pff000 !

I assume you are trying to use the Composite RCA video output jack on the back. My IIc is the same. No Video out via that port. People have told me I need to apply solder to that connector as a potential fix, but because I have Plamen's (A2Heaven) IIc-to-VGA adapter, I've not set out to do...

@phipli I only brought my SE/30 motherboard home with me for the weekend, but below are the test results using recommended RAMometer app. (And yes, I chose to Shut Down all background apps to ensure the best results.) I ran it 85 times only because I stepped away for about 15 minutes to...

@YMK PerformerSE & Apple Personal Diagnostics v1.1.3 Very odd because when I first launch the app and run ONLY the CPU Speed > Memory test, it shows 1.61x faster... But then if I click "Run All Checks" it drops that Memory score to 1.09x faster... That huge change doesn't instill...

Thanks for the tip. Seems to be "Memory" under "CPU Speed" within the "Benchmark Checks" button... No time this evening so I'll run that tomorrow and post back then.

NOTE: All tests below were done with 33MHz Crystal (FPU only) installed in MacEffects Performer-SE. GemStart 3.0 Control Panel Info JDW's Speedometer 3.23 Results with GemStart 3.0 (System 7.1) Ron's Speedometer 3.23 Results with MM Performer 2.2.1 (System 6.0.8) JDW's Speedometer 3.23...

There is no XTAL socket. I soldered the XTAL's 4 pins directly to the PCB pads. Separately from that, I see a README file... It says... Interestingly, your recommended Macintosh Garden download contains v.2.1 (within "gemstart.sit"), not the recommended (above) v.2.2: The MacEffects...

I have very limited time today, time that will be used only to test your recommended control panel. Tomorrow will be very busy for me as well, but if I can check the frequency tomorrow, I will try. Otherwise, that must wait for Monday. Even so, what you are suggesting is that the...

More specifically, you seem to be referring to DL#14... And it seems I need to expand the file named "gemstart3.sit": Very interesting... It uses the same icon as the v2.2.1 Control Panel I am using now... I must assume that means we must use the file named "gemstart.sit" with System 6?

Yes, as per the instructions. Similar photo showing solder blob appears on @Bolle 's Github page. On that same Github page, the following text appears (I added clarity in brackets): All PCB files and renders at shown at Bolle's Github. I simply dropped the files into the Gerber viewer at...

@phipli I installed the official Control Panel and Extension shown on the MacEffects Performer page. I will give your recommended drivers a try later today and report back with Speedometer 3.23 benchmark results at that time. @YMK There is indeed a huge memory bandwidth difference, and I...