Mega Midget Racer: Am I missing something here?

[joekster]

Yeah, the speed of the MMR w/o 32bit ram is aweful!!! You are actually lucky with Tom's 8mb board. It uses SRAM which is about 5% faster than dram (no refresh cycles/delay). You can put 512kb of SRAM on the MMR and it will be really fast! - should put your sysinfo rating about 10% higher than a stock a3000... I just happen to an extra set of those chips, send me a PM if you are interested.

[number6]

@thread

I have one of these with dip socketed ASSY21303A.
A500 not hooked up atm.
Are you looking for SYSinfo results from the mainboard/daughterboard populated?

#6

[AmmoJammo]

I know the kinda benchmark score it'll do with the extra memory, google seems to find that

I'd also seen results that were low, like mine, but the pages weren't in English, I can only assume they were lacking ram :p

http://szergitata.blog.hu/2012/06/24/amiga_500_turbokartyak_7_befejezes_mega-midget_racer

[AAACHIPSET]

So, ah, i guess ill never find a ram module for this.

i agree  about the  32 bit ram  ..i never found a module  for  mine  ..but  although i cant  quote  figures  ..when i had mine  in my a500  it did seem faster than a standard
a500 ..more  like a 1200 ..i was running  kickstart 3.1  ..would  that make a difference ?? super fat agnes  so 2 meg  chip as well ..

[psxphill]

i agree about the 32 bit ram ..i never found a module for mine ..but although i cant quote figures ..when i had mine in my a500 it did seem faster than a standard
a500 ..more like a 1200 ..i was running kickstart 3.1 ..would that make a difference ?? super fat agnes so 2 meg chip as well ..

There is 512k of ram on the board, which can be used as ram or for speeding up kickstart. So it might be possible to get close to an a1200. Depending on how the software you run fits into the 68030 cache.

[AmmoJammo]

just been playing with my A500 again...

it seems I can plug the 8 meg tomthul ram between the motherboard and MMR, OR, I can plug it into the MMR 68000 socket, and workbench can still add and access it...

question is, can I plug it into the MMR and overclock the ram to the same speed as the MMR, rather than running it at the same speed as the system bus?
keeping in mind that it just crashes when I attempt to run in 68000 fall back mode anyway... so I'm all for cutting tracks to the 68000 socket on the MMR and running wires! :p

[Megamig]

Kinda off the topic here.. I own a Mega Midget Racer with RAM board and original box. Out of service atm because I broke a few of the pins that stick into the 68000 socket. When it did work I could not get the Racer RAM to appear. Do you have to run a program (patch) in the startup sequence similar to the CSA Derringer 030 to get the RAM to appear? Secondly, does such a program work under newer versions of Kickstart such as 2x or 3x?

[number6]

Kinda off the topic here.. I own a Mega Midget Racer with RAM board and original box. Out of service atm because I broke a few of the pins that stick into the 68000 socket. When it did work I could not get the Racer RAM to appear. Do you have to run a program (patch) in the startup sequence similar to the CSA Derringer 030 to get the RAM to appear? Secondly, does such a program work under newer versions of Kickstart such as 2x or 3x?

Yes. First line of startup-sequence:
[path] CSA-MMR >NIL: SRAM DRAM

Yes, it works with Kickstart 2.x.

You can get the manual from links offered earlier in this thread.

#6

[Crumb]

Perhaps some electronic guy could take a look at the bus to discover if a 3rd party board could be produced. Someone with one MegaMidgetRacer and the expansion ram could tell us if the ram appears as a different board or as the same board. Perhaps it's just a "normal" autoconfig board with 32bit access to the ram and NedoPC's design can be modified to work with 32bits and that bus.

But I guess that wouldn't be possible without a lot of experience and knowledge about electronics

[AmmoJammo]

TomThul 8meg, 512k inbuilt, 512k trapdoor configured as chip, and 512k on the Mega Midget Racer...



Thats more like it! :hammer:

[AmmoJammo]

33Mhz crystal? I changed the scale, but you get the idea :p

[AmmoJammo]

I still have the issue that the MMR won't run in 68000 mode?
whether hardware switching, or software?

do you think the accelerator card may just be faulty?

I get the software error screen, with the flashing red box around the red text?

Another time I just got a blank red screen? "An error was found in the ROM."?
and a flashing power light.

I've tried two different CPUs, 68000 and 68010?

thanks!