See -> https://www.exxosforum.co.uk/atari/last ... /index.htm

The Atari TT Fastram board is a 4MB one, not upgradeable to 16MB.

Four pieces 1MBx8 Simm ...


Maybe only the 100nF capacitor had a short ?

Atari recommends SIMMs with 424101 chips on them, these are "nibble mode RAMs". Take the fastest possible PC SIMMs (60ns) and tried with burst mode. If it doesn't work the burst mode must be switched off. ... if you don't get the same Simm for exchange you have to replace all four Simm mod...

DFB1 and Blitter do not work.

Use the patched TOS 4 from Badwolf with Fastram Support or EmuTOS ...

Epromtyp

571001/27C1000/531000 - W102= 2 and 3 - W103= 2 and 3 - W104= 2 and 3
27010/571000/27C1001 - W102= 1 and 2 - W103= 2 and 3 - W104= 1 and 2

... may be replace/check Y301 and/or C306/307 ?

My experience is that an FPU on the DFB1 Atari Falcon Speeder does not work properly at all.

HigashiJun wrote: ↑Thu Jun 15, 2023 11:54 am I will contact Bradley and ask him for a quote.

Ask him it's the same 7,8mm height before you buy ...

BEST Gold ...

I once had similar problems with a Mega STE and I was looking for a fault and can not find one ... (habe mir einen Wolf gesucht) With a thin and fine needle I went directly with the multimeter to the contacts on the PLCC 68k chip and not to the contacts of the PLCC socket. All looking good but I fou...