Recent content by billbucks

That's a good advice, I will check on the various site incl ebay bit I doubt I'll find any... I finally managed to solder the SWIM chip pins as discussed (see photo) but that didn't fix the issue. I'm still getting the horizontal lines. I used my digital multimeter to test the capacitors on the...

Thank you for your feedback. I'm aware of the risks and this is an attempt to revive a faulty motherboard I'll use standard resistors and see how it goes

For the resistors, would you recommend using SMD components and normal ones ? If I use SMD, I wonder if it'll work soldering it both on the motherboard and a wire to connect to the 5V pin (22)

Thank you for the link, it is very interesting. I looked at pins linked with the CPU that would be worth connecting to the GND (pin 1) or 5V (pin 22 Vcc): 43 (/DEV = Device select) --> 5V 25 (/RESET) --> 5V 37/40/41/42 (A0-A3 : address lines) --> GND Do I need to add a resistor before the 5V...

Thank you for your feedback. I indeed need to check that. The initial fix was suggested by ChatGPT... (I don't always trust it but it can sometimes be relevant) - It considered that Pins 20 (WR) and 21 (RD) and read and write signals - It seuggested pulling D0-D7 data bus lines to +5 or GND - It...

Hi, I'm going to make an attempt to fix the board without floppy drive support. Attached is an updated view of UJ11 connector's pins positions based on your reply. I'm planning to connect pins 20, 21 and 38 to 5V, each via a 10K resistor. Does it make sense ? Where should I find a suitable 5V...

Hi, I just found a similar project: Apple2Card

I'd like to try the SmartPort SD to use as an, HD emulator for a 2GS since I have a floppy drive. What firmware do I need for the 2GS and is it now stable ? I looked at Github and I'm not sure which file(s) to send to a maker (e.g. PCBWay) from the Gerbers folder. Any help would be appreciated...

Thanks for your feedback. The suggestion I got won't work so I'll look for a SWIM replacement unless I figure out how to wire some UJ11 pins to remove the error (these schematics can be useful). Attached is my understanding of the SWIM pinout ; is it correct ?

My intent is to remove the error screen and not use the floppy drive on the Mac SE30. If I use the IWM, could it solve this issue i.e. will the Mac SE30 be ok ? I saw @Kay K.M.Mods project which is useful to identify the matching pins between both chips. Shouldn't it be feasible with a DIP28...

Someone suggested I could reuse the IWM chip from a Mac SE board (see photo) which I have. Could it work ? The corresponding pins could be determined from each board's schematics I guess.

Thanks for your input. Attached is a photo of the UJ11 location where the blown chip has been removed. 3 of the connectors have been damaged (see photo) so I'm concerned I might not be able to solder a replacement chip should I find a dead Mac SE30 board ... Can it be fixed ? Whilst I found the...

Update: I managed to test the 2 GS with a friend"s EU PSU, it worked well. The cheapest PSU option I found is from the PicoPSU adaptor from tindie. I also purchased the RAM2GS to have 8GB of RAM. Will post an update once the setup is complete.

Here's an update: I managed to remove the UJ11 chip. The Mac SE30 now starts without any sound/bip and with horizontal lines as on the photo. I'm not sure if this related with a capacitor (replaced 2 years ago) or if another component got damaged. It looks like the Simasinac as on...

Was is the same Astec model ? Is it the one here : https://www.apple2faq.com/apple2faq/convert-us-power-supply-220v/? I opened my Astec 699-0126 PSU and it's not the same model (see photos). I checked the fuse and it's still ok. I wonder what probably burnt having plugged the 110V PSU to 220V...