theangel540
n00b
- Joined
- Jul 14, 2020
- Posts
- 9
Hello.
Have troubles with my 4 slots.
green garbage/tiles on screen. Probably, content of the NEO SFIX ROM.
J2/Watch dog jumped with iron for stoping reseting.
I have traced some signals with my scope.
My BIOS/SP1 want to boot a fraction of seconds (activity on A0, A1, D0, D1...).
I insist of "fraction" of second.
Strange thing: OE is alway LOW (+vcc > inverted input). OE MUST pulse like AO, A1 etc ...
On the MVF4FS, OE is routed in NEO-E0 (output pin 59).
there is an AND gate inside (?) pin 60 + pin 61. these are HIGH (+vcc). OE (pin 59) is HIGH (+vcc) so LOW (inverted) for the eprom.
PIN 60 and 61 are routed to NEO-C1.
PIN 12 and PIN 96 on NEO-C1. All these output HIGH (+vcc) at startup!
NEO-C1 dead ?
Thank for your time.
PS: 68K is new one with support, x4 SRAMs news , work ram pulse.
Have troubles with my 4 slots.
green garbage/tiles on screen. Probably, content of the NEO SFIX ROM.
J2/Watch dog jumped with iron for stoping reseting.
I have traced some signals with my scope.
My BIOS/SP1 want to boot a fraction of seconds (activity on A0, A1, D0, D1...).
I insist of "fraction" of second.
Strange thing: OE is alway LOW (+vcc > inverted input). OE MUST pulse like AO, A1 etc ...
On the MVF4FS, OE is routed in NEO-E0 (output pin 59).
there is an AND gate inside (?) pin 60 + pin 61. these are HIGH (+vcc). OE (pin 59) is HIGH (+vcc) so LOW (inverted) for the eprom.
PIN 60 and 61 are routed to NEO-C1.
PIN 12 and PIN 96 on NEO-C1. All these output HIGH (+vcc) at startup!
NEO-C1 dead ?
Thank for your time.
PS: 68K is new one with support, x4 SRAMs news , work ram pulse.
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