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MHDD. An older version for CHS only disks.

Laptop IDE is just IDE with two extra pins for power, so if drive is "almost" good any cheap adapter like this (the first I found!) will do the job...

To test diodes and transistor use a multimeter in diode mode (plenty of YT videos ...). This is a link to the swicther IC datasheet : http://images.100y.com.tw/pdf_file/38-ST-TEA2018A.pdf at page 6 there's a schematic with a typical application. R8 could be a low value resistor that acts...

Since the fuse is blown, be aware that most likely you have more damage on the primary side other than the switcher IC. I can see a dark spot on R8 too. I would check thoroughly any component on the primary side, especially semiconductors. TR1 is probably shorted.

This is a set of pictures of a full recap I made years ago on a Olivetti 286, original caps were fully rotten ... This power supply is used in several machines. The switcher should be this : https://www.alldatasheet.com/datasheet-pdf/pdf/25314/STMICROELECTRONICS/TEA2018A.html

Take a look at this link too https://lemonspawn.com/turbo-rascal-syntax-error-expected-but-begin/

According to datasheet EH11A is a marking ID for AZ1117H-ADJTRE1 that's the actual product, an LDO voltage regulator. Look at page 15 of datasheet, lot of markings for different packages and output voltages. AZ1117H-ADJTRE1 is the adjustable version of SOT223 package.

Bridge them with some jumpers or use some switches. They select wich one of the three 8K ram bank (BLOCK 1,2 and 3) are used.

With a little practice can be easily removed with a standard iron, but if you want to be safe just cut all the pins with a good flush cutter and clean the pads adding some solder and flux.

You can use MHDD if you want just a full dump of the drive, https://hddguru.com/software/2005.10.02-MHDD/ there's a command that copy a range of sectors (or the whole drive to a file) https://hddguru.com/software/2005.10.02-MHDD/mhdd_manual.en.html#tof Even DMDE can make a dump of a drive...

Back in the days, when I had just the datasette, I used "Super Assembler" found in this magazine. https://ready64.org/download/scheda_download.php?id_download=291 It's the italian translation of this...

Try ZU files.hddguru.com/download/Software/zu.betta.050911.rar

The Transactor Magazine published these : https://archive.org/details/transactor-magazines-v9-i02/page/n68/mode/1up 256K https://archive.org/details/transactor-magazines-v9-i06/page/n25/mode/1up 512K

Could be just the polarizer. However not so easy to replace.

What's the drive? Brand and model.

The LM323K is not a transistor, it's a linear regulator and it's actually rated for 3A. https://datasheet.ciiva.com/26904/lm323k-26904502.pdf Can't read properly the marking on the picture, but on the service manual I found CR5 and CR6 are a couple of 1N5402 rated at 3A...

Take a look here http://m1web.de/ADTWin/

Nice work. Back in 1991 I used "KEYBIT Lite" with my first PC 8088/10MHz/Hercules Mono ... My C64 died and it was an ... upgrade! I found the latest version here with source code included : https://digilander.libero.it/pnavato/ita.html

If I remember correctly Turbo Pascal supported Boolean Short Circuit Evaluation since version 4.0.