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#retrocomputing

322 posts227 participants2 posts today
Continued thread
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Amand Tihon

All orders have been delivered, time to replace the the RTC chip on the #PentiumPro motherboard.

Removing the chip went well with the desoldering gun and a bit of help with hot air for the GND pin.

I soldered a socket and used a nwX287 by Necroware. It feels slightly wrong to use a Varta battery in there but I guess that one will be fine.

Close up picture of the corner of a Pentium Pro motherboard. The battery-integrated RTC chip has been desoldered and lies next to the motherboard.
Close-up picture of a corner of a Pentium Pro motherboard. The battery-integrated RTC chip has been removed. Next to the motherboard lie a 24 pin DIP socket, and a small red PCB with a battery holder.
Close-up picture of a corner of a Pentium Pro motherboard. On the motherboard, in place of the battery-integrated, a small red PCB is socketed.
#retrocomputing
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Riley S. Faelan

Such impertinence! To stretch a paw out of software and upgrade the hardware!

SPL requires a Z80 CPU to run and the resulting programs also require a Z80.
On SIMH, SPL will automatically switch the CPU if an 8080 is detected. On
#retrocomputing
Public
Karl Baron

So in my process of porting my MPW C program to CodeWarrior I'm now past the easy part of "need to make missing header files and rename old function calls" and into the need-to-read-a-book parts of "C doesn't have a concept of booleans so what does this compiler expect" and how to make pointers to function kind of stuff...

A macos 9 screenshot of CodeWarrior showing the incomprehensible compile errors
#RetroComputing#VintageApple#CodeWarrior
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rawe

Oh look, a random relic from aeons ago: Original #SunMicrosystems sign from the 1980s featuring the 1984 logo.

It was outdoors for soooo long that the labeling faded away nearly completely so I had to re-apply it and accidentally upgraded to the 1996 logo. Oops...

Did I mention that I collect weird random old stuff?

Faded old sign. Text is only readable by observing surface finish
Sign with new label
#retrocomputing
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Laurent FRANCOISE

Je rattrape (un peu) mon retard dans les montages à assembler avec ces deux "NOP testers" pour #z80 et #mos6502
Et un NOP testeur céquoidon ? C'est un montage qui permet de vérifier qu'un microprocesseur est vivant en présentant la commande NOP sur le bus de données (câblée en dur sur le circuit) et en regardant ce qu'il se passe sur le bus d'adresse : la commande NOP ne faisant rien le processeur passe juste à l'instruction suivante ce qui a pour effet d'incrémenter l'adresse, visualisée ici avec une série de LEDs.
L'horloge est ici un 555 pour que ça aille assez lentement pour y voir quelque chose !
#retrocomputing

Deux petits montages presque identiques, un pour Z80 et un pour 6502, les deux sont alimentés via un câble USB, au centre un support à levier 40 broches et en bas une série de 8 LEDs représentant la moitié du bus d'adresse. Le testeur Z80 est alimenté et quelques LEDs sont allumées.
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