Recent content by Kris92

I'm working this way (a bit). I added direct support for both Apple ROMs and 27c010 EPROMS. RC filters can be originals ones or SMD version on the PCB. And I added the frequency divider for better 16F88 support (ADB).

Does someone know why A19, A20, A21, A22 routing from the CPU to the PDS slot and the BBU use so a long path ? Is it to avoid a timing issue ? Here is an example of A22. As you can see, the path do a full loop before being routed to the BBU...

Just fixed my problem with a new BBU. BUT : New chip is 344S0603-B and previous was 344S0603-A. So was my 344S0603-A just partially broken (can't access more than 2M) ? Or not compatible with a reloaded board or SE board with jumper ? I noticed JDW used a 344S0603-A for its YouTube build. But I...

No of course. I tested all the ICs on another board and got the same problem. I tested with different SIMMs. Curiously, a set of 4x256k SIMMs was recognized (1MB total). I'm waiting for another BBU next week.

Thank you ! I will dig a bit deeper.

Can someone confirm that the finder report 4Mb with maceffects board 1.6b ? Mine only report 2Mb. And I found different routings with 74F257 chip within the PCB, boman and retraced schematics. It may be the origin of my problem. Or a defective BBU. Before someone ask, J16 jumper is not set.

Did you look at cpld source at https://github.com/garrettsworkshop/WarpSE-firmware ? I did a quick scan of the code and it seems to be matching the latest PCB.

I haven't a serial cable to test my fix on the serial port. But here is the mod : For the SCSI port, I found the simplest solution. Just remove the pin from the SCSI connector. SCSI is still working after this mod.

I will post a picture as soon as my board will be assembled (1 or 2 weeks maybe). But only one issue can be fix. The other one can't be fixed and is not critical...if you don't reverse the internal SCSI cable...

Hello, A long time passed since the last PCB revision. I found 2 errors : • pin12 from 26L32 (C3) is not connected to GND. It may cause some instability on serial ports. • pin 25 on internal SCSI connector (J5) is connected to GND. Normally, it should not be connected to GND to prevent a drama...