Recent content by RetroTheory

Hmm, how many chips on the SIMMs ? if its 2 or 3, its kinda hit or miss if they work. 8 or 9 is more common to work, having said that I have 2 chip 30pin SIMMs in my Plus. https://support.apple.com/en-asia/112183

Have you checked the RAM is correct and matches the cut resistors config on the board ? Sometimes resistors are cut and then RAM is downgraded which can lead to odd behavior

I made a program with Retro68 cross compiler with a strange likeness to the like clock Maclock. Watch out for the clock bug, where DAY does not match date. I find 1998 works for this year. @This Does Not Compute gave me the idea when he converted the clock into a vintage Mac, I wanted to see if...

5155 monitor system, 12v composite video input I took the yokes off . and kept the mac yoke with the Mac. The 5155 tube has the anode cap on the opposite site with respect to the end connector. I had to extend the wires to rotate the board so it would fit with the anode cap in the...

The naked CRT is the CRT module for the IBM 5155 , but all it needs is 12V and an ntsc composite video signal. The video is inverted with CloseView , with magnification turned off , but leaves a tell-tale zoom box see bottom right , its also a little slow. There is an invert video program...

Unfortunately not easily. You would need a composite to sync separated video. However it could be a project for rgb2hdmi with 15khz rgbhv video out to cpc , I have never tried that output mode

This is my tube swap between a mac and a 5155 monitor chassis , as long as crt band mount is the same you should have no issues

Wow great job, congrats on getting it going again. That board was with a stack of 4 840AV boards that originally was part of Apple waste back in the day when the 840av was current. Apple were less careful with their waste back then and these were thrown out due to cosmetic issues. At the time...

Happy 40th!

There is also this clone made by ALPS (MEADB-), But inside we have a familiar IC. Not sure if the membrane layout is the same though

Great project , I have a few different ones Made in Czech Rep. 3 Screws on base Assembled in Thailand, 4 screws on base

The VGA monitor config is not available on the IIsi, best to select something like "Apple Macintosh Color Display" or any of the monitor types here without the '*' https://bitsavers.org/pdf/apple/mac/monitor/monitor_sense/hw_30.pdf and hope the monitor can do composite sync / sync on green

Great work , I got a chance to try it out today on the Powerbook 180. Speed is about 30K/s. I coudn't pin it down, but it seemed I had to ping out from the powerbook with MacPing to get the network to go live. Will do more testing ..

Sounds like a cool event, here are my two entries. o7

Some cool things are possible with SCSI target mode and bluescsi, here I have no drive at all in IIsi, both the HD and the CD image are mounted over target mode from my powerbook 180.