Recent content by pezter22

Would something like this Overeasy 25pin to 50pin SCSI adapter work for a internal drive? I know I would still need power, but just seeking suggestions for a internal drive for the Mac 512k. Is it just the BlueSCSI that will not work? Is a ZuluSCSI a better option? Sorry for all the...

Thanks for the info. I will check voltages later today on both original and recreation boards. Are the resistor packs on the MacSnap OG and RE boards required when using a BlueSCSI or any external SCSI? When I bought this Mac512k it had the MacSnap RAM expansion board and the SCSI board. The...

I finally got power to the BlueSCSI 50 pin. I rechecked my connection from the Pico power supply and did not have the connector in all the way. On reboot I did get a power LED on the BlueSCSI, however the activity LED came on for only 5 seconds then shut off. I rebooted with my FloppyEMU...

Builder68 thanks so much for all your help. I was able to get 2mb of RAM installed with the MacSnap RAM expansion board. This is great. I also installed the MacSnap SCSI adapter. I added a 50 pin connector to it. I made sure to match up pin 1 with the card and the connector. However I am not...

Thanks for the additional information. Those piggyback sockets are unobtainable. I was going to solder some machine headers to the LS04, but it's definitely difficult to line them up correctly. I think it would work better for me to run a jumper from the motherboard to the expansion board. I...

Thanks for the much needed info. That would explain why when I opened up the Mac 512k, I saw that a previous owner had clipped off the resistor packs. I added them back on, but will remove them as I get closer to getting it back together. Right now I just have the original RAM expansion board...

I just finished building two of Demik's MacSnap SCSI boards today. I'm hoping to install them in my Mac 512k's with that have the MacSnap RAM expansion boards. I think I saw why one of my boards was not providing the 1.5mb. I just saw that I did not place a resistor at R53 near the 74F253 IC...

I have a MacSnap SCSI card that I broke two pins on the ROM headers. I used a portion of a through hole capacitor leg for my repair. The leg was the same diameter of the header pins. You can solder it onto the header. I've done the same with broken CPU pins. Best to have a small solder tip...

This is great information. I have a couple of MacSnap RAM expansion boards that were installed in two Mac 512k's. One had just the bottom portion of the board filled (512k RAM) and the other was fully populated with a MacSnap SCSI board. I populated the board with similar RAM chips and I was...

I just built my third Bolle MicroMac Performer card. I combined it with another project that I am building - a CatMac SE. I find that it is better to place the GAL chips on first to make sure the pins are soldered on correctly then place the remainder of the components on.

This is great. I just finished printing my testbench version for a Mac IICX I am working on. I have a Mac IICI next. Thanks ZigZagJoe for the design. It snaps together perfectly.

This is a great project. I recently purchased a Mac 512k and was surprised to find a MacSnap RAM expansion card installed. I found your SCSI recreation board and ordered some PCB's. I was planning on using a BlueSCSI v2, but was concerned about power. I have several old external 20mb SCSI...

I did try the ST M27C512 with the Plus flashed into them, but had a similar result. I'm going to have to wait until the WinBond W27C512 ROM chips arrive. Turns out the ST M27C512 ROM chips have data on them and I don't have a strong enough UV light to erase them. I just read the chips and...

I did not expect success with my first try. First image is with stock Mac 512k 64mb ROM - No chime and steady screen distortion. Second image is with ST M27C512 ROM's with Mac 512k flash. - No chime. Distorted Growl, then screen would flash, then go blank. This would repeat. Any...

All wired up. EDO RAM in place. Switches are set. I'm going to attempt to boot later today. ROM I think will be my issue with booting. I currently have stock ROM installed. I have some ST M27C512 ROM's programed for the 512k. I also have a BMOW ROM-inator that I am setting up later today. I...