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Macintosh-SE-Reloaded
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Update README.md 

Addition of A18 pin
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Kai Robinson 2024-02-27 22:21:33 +00:00 committed by GitHub
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![Finished Logic Board](/macseboard-final-rev15-release.jpg)
![Finished Logic Board - Bottom](/macseboard-final-rev15-release-rear.jpg)
**Latest version, v1.6 adds an A18 address pin next to UE1, a 74F257 to allow for potential ROM upgrades as the standard ROM sockets only allow A1 to A17 address lines.**
So many classic macs, starting with the SE, have died because of Apple's short sighted decision to add a battery to the board. This inevitably leaks and causes a horrific amount of damage. Luckily - most of the custom chips survive even this, so I decided to make a near 1:1 reproduction of the board, using Sprint Layout v6.0
Project inspired by Rob 'Peepo' Taylors work on the A500++ and the SixtyClone PCB's, which in turn were inspired by John 'Chucky' Hertell.
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* **AM26LS32's** - Available new, but still worth reclaiming
* **MC3488A** - NLA - replace with Texas Instruments SN75150
* **Rockwell 338-6523** - This is identical to the 65C22N VIA, still available new
* **RTC Chip** - Custom Chip - maybe possible to clone using pin-compatible ATTiny85
* **RTC Chip** - Custom Chip - this has been reverse engineered, see project here: https://github.com/pgreenland/attinyrtcmodule
* **ADB Chip** - Apple branded PIC16CR54 - maybe possible to re-produce/clone
* **GLU Chip** - Apple branded HAL16L8 - this has been reverse engineered for both GAL16V8 and discrete logic!
* **BBU Chip** - Custom Chip