My A500 "project" pics, details, build log?

[AmmoJammo]

I'm beginning to think there might be an issue with the 512k of ram on the Mega Midget Racer... :/

[AmmoJammo]

It only sometimes fails, Ive removed it from the startup sequence, still crashes.

[AmmoJammo]

Worked without the MMR... copied about 100 megs...

put the MMR back in... failz... :/

[AmmoJammo]

thought I might have been putting too much load on the powersupply, but the 5volt rail is at a pretty solid 4.9volts, 12volts is spot on 12...

[AmmoJammo]

tried clocking the MMR at 36Mhz, 33Mhz, and the stock 25Mhz... same issue...

doesn't work...

I think I might just pack the whole setup in a box and leave it alone :/

took a few photos:







I also had an "Orange screen of recoverability" :p
workbench said it was a recoverable error, then proceeded to reboot anyway...

[AmmoJammo]

got the tomthul 8meg.

when I tried it without the MMR, I still had the tomthul ram, and had no issues...

WB3.1 won't run overly well with only 1 meg, so can't exactly try it without.

[AmmoJammo]

only 512k on the MMR.. makes no difference if its installed, removed, setup, or not setup... it still crashes... so its not the 512k on the MMR that's the issue, it's probably the MMR not working properly with the A590 scsi controller...

the MMR won't work in 68000 fall back mode at all with the A590, to boot from the HDD, with the 68000, I had to completely remove the MMR.

[AmmoJammo]

Pulled the fpu, still crash.

Now Ive removed the fpu and tom thul, reenabled the 1meg in the a590 and we shall see what happens.

[AmmoJammo]

And the update:

TomThul 8meg + Mega Midget Racer + A590 SCSI controller = no

-TomThul = yes....

it appears to work flawlessly without the tomthul 8meg.... most FRUSTRATING PIECE OF HARDWARE EVER!

[AmmoJammo]

There's nothing wrong with the MMR...

I've decided the best place to install the TomThul 8 meg, is here:


It's totally unreliable, and apparently not compatible with much more than a stock A500...

I guess that's what happens when you try to mix old with new :/

With the 512k inbuilt, 512k trapdoor, 512k on the MMR, and 1meg in the A590, it seems perfectly stable.

[AmmoJammo]

and only just NOW you decide to tell me this? lol

[AmmoJammo]

and now WHDLoad doesn't work...

games just flash to a black screen every few seconds, sometimes at the same time as the power light flashes...

*sigh*

CD Rom works well though!

[AmmoJammo]

Apparently the flashing is due to insufficient ram.
Well, ah, yeah, makes sense, dont have a solution though!

[AmmoJammo]

When I get my auto config 8mb board ill bring it over if you like to see if that works?

might be worth a try... how far away is it? :p

I found the tomthul to not work at all between the accelerator and motherboard, but worked to some extent plugged into the accelerator..

Not sure how well Klippers would fit on the accelerator... Really want/need more 32bit ram anyway

[AmmoJammo]

As is, I have 1meg chip, 1.5meg "fast" ram....

because 1meg of the fast ram is in the A590, workbench uses that first, and lives me with almost a whole meg of chip ram free...

I can add another 1 meg to the A590 scsi controller, if I can find some suitable... which may be all I need to get things working right

[AmmoJammo]

got fastmemfirst in your startup sequence?