Recent content by T-Man

Relooking at the boards I have (one battery bombed IIci and three battery bombed IIsi) and online pictures now pretty sure I have a number to add for MDU identified both on IIci and IIsi logic boards. That is 344S1018-03 which is both on the Recap-a-mac picture of IIci logic board and a IIsi...

Bummer….not finding the part number on another board to replace UK11 MDU on the IIci board…. maybe file some edges and microsurgery someday

So it’s looking like the MMU on IIsi and IIci are the same chip. The build will be a while but will give it a shot. Thank you for posting. Will go look again, on looking at the traces leaving the chip, there seems to be diffeneces.

I have a battery bombed Iici with several legs of the MMU (and multiple traces) eaten away. Aside for the MMU, the other chips look salvageable. I have a Bolle Iici new board and some parts for it and had planned to use a IIsi board to salvage chips /IC's as a backup. However, now looking closer...

Still pulling this one out every so often. So no charge or any activity on the screen, however, the analog/screen combination work fine when I put in a known working logic board. On start up about half of a second noise from the internal floppy, a minimal static from the speaker; nothing at...

Anyone out there with PAL/NTSC experience? I'll start by saying I'm amateur so my terminology below may not be correct. This computer is powered by a 9V DC jack. So it is not getting any type of 60 hz from the AC. The design of this ZX 128 MAX is for PAL output and I'm pretty sure that is...

Thank you. Strange but fixed. Lots of focus on the video circuit and resolution. Checked the main oscillator and it was slow. I thought there would be no way I was getting any kind of picture if this wave form was accurate. One of the caps connected to the oscillator had a trace, like...

Hello all. A bit of a shot in the dark but after buiding and then after some delay programming the ROM and FPGA I was excited to get the following screen. At first I thought this was a PAL/NTSC issue, but on the schematics the RBG output comes before the video processor (AD724JR0 IC). The AD724...

Have been getting a RaSCSI updated to PiSCSI which never did workout using a headless Pi Zero installation; not a realistic process, however did get it working by putting a Pi 3B in the mix. After removing the PiSCSI (w Pi Zero W) from the case I noted it was really hot almost to the point of...

Parts machine; have a Cutting Edge external drive and plugged the internal cable in off 1 pin; now no screen, no beep.

Yes...after removing the double sided tape on the analog board, there were a couple of broken solder joints at J1; so after reflowing, I am back to the smiley postage stamp pictured, it seems to boot based on disk drive activity but the screen remains as pictured . The screen looks about right...

Awesome thread. After looking at your recaps, rest assured, I will never be posting a picture of my recaps. Looks great.

Speaking of caps......power supply of same IIsi

Sorry if this is obvious or posted somewhere else, but I have a Macintosh plus that chimes and then HAD a small postage stamp with smiley face and no error code. After a few off and on's, it now has a thin line the width of a postage stamp in the center of the screen. It still chimes and I...