Hi all,
thank you for your suggestions - I have since identified the particular "faulty" RAM chip at location F5. Unfortunately, the RAM is not socketed (then again, the same goes for the 512K board I have). I recognise I've little to lose, so I do intend to remove the F5 RAM chip to diagnose the fault - would it be better off to use a solder sucker to attempt to remove the entire chip cleanly, or snip the chip off at the legs and solder the new chip on top?
I can post pics if useful, however the RAM chip is identified as:
128K: 8432; Apple symbol MT 4264
512K: NEC 8428P6734; D41256C-15
I was planning to post this in Conquests, but the 128K was found last week while driving around for work doing house calls (medical), just like the last 128K I found (about ten years ago, a "Macintosh 128K" with carry bag). The one I found is a bonafide "Macintosh" with Imagewriter I printer, and the white plastic case with all original disks, cassette tape and power cables for other countries! Most amusingly, someone cut all the cords off - anything that gets chucked around my way attracts those who sell the cords for scrap metal value :lol: Exterior and interior it shows next to no signs of use, hardly any dust, perhaps sitting covered in a garage for years after the Sad Mac error cropped up. Made for a nice day in a busy week.
JB
thank you for your suggestions - I have since identified the particular "faulty" RAM chip at location F5. Unfortunately, the RAM is not socketed (then again, the same goes for the 512K board I have). I recognise I've little to lose, so I do intend to remove the F5 RAM chip to diagnose the fault - would it be better off to use a solder sucker to attempt to remove the entire chip cleanly, or snip the chip off at the legs and solder the new chip on top?
I can post pics if useful, however the RAM chip is identified as:
128K: 8432; Apple symbol MT 4264
512K: NEC 8428P6734; D41256C-15
I was planning to post this in Conquests, but the 128K was found last week while driving around for work doing house calls (medical), just like the last 128K I found (about ten years ago, a "Macintosh 128K" with carry bag). The one I found is a bonafide "Macintosh" with Imagewriter I printer, and the white plastic case with all original disks, cassette tape and power cables for other countries! Most amusingly, someone cut all the cords off - anything that gets chucked around my way attracts those who sell the cords for scrap metal value :lol: Exterior and interior it shows next to no signs of use, hardly any dust, perhaps sitting covered in a garage for years after the Sad Mac error cropped up. Made for a nice day in a busy week.
JB