68kMLA Classic Interface
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| Reverse Engineering the Macintosh SE PCB & Custom Chips for 1:1 reproduction | |
| Posted by: Kai Robinson on 2020-11-21 02:55:46 @Trash80toHP_Mini - here you go: https://drive.google.com/file/d/1qXWsemDG4Ypb7kUFZebFNU_NZiY-CQuv/view?usp=sharing | |
| Posted by: Kai Robinson on 2020-11-21 02:56:55 Porchy has worked some magic and behold - a .JED for the GLU!! A Proper fuse map! 😱 Is anyone in a position to test this aside from me? View attachment apple1.jed | |
| Posted by: Bolle on 2020-11-21 03:36:28 What type of PAL is this originally? Converting it to use a GAL or an ATF replacement would be useful I guess. Edit: nevermind, fusemap already is for a 16V8 type device. I'll give it a try later on. | |
Posted by: cheesestraws on 2020-11-21 05:24:44Porchy has worked some magic and behold - a .JED for the GLU!! A Proper fuse map! 😱 That was an impressively quick turnaround! | |
Posted by: Kai Robinson on 2020-11-21 05:30:30That was an impressively quick turnaround!I know! I'm unreasonably excited for this now 😀 | |
Posted by: Trash80toHP_Mini on 2020-11-21 09:36:26@Trash80toHP_Mini - here you go: https://drive.google.com/file/d/1qXWsemDG4Ypb7kUFZebFNU_NZiY-CQuv/view?usp=sharing Nope, Guide to the Macintosh Family Hardware Second Edition is the book @quorten was referencing and it's available on vintageapple.org already. Got that one new off the shelf in the day, it's the 1990 update to the three part series. Technical Introduction to the Macintosh Family is the first book on the map and may suffice Macintosh Family Hardware Reference has (more or different?) info for the SE and Mac II, that's assumed to be understood in GttMFH2e. So MFHR is the one to search for in .PDF out in the wilds. Unfortunately abebooks is sold out, but you might find a hard copy at a reasonable price somewhere else.
edit: found one: used copy for $28.32  | |
| Posted by: Kai Robinson on 2020-11-22 12:49:15 Only $254... | |
| Posted by: Trash80toHP_Mini on 2020-11-22 16:11:13 LOL! Gotta love the listed prices for new books And that only gets you the paperback version! Click on the 7 used from $25 link to get over the sticker shock. [🙂] I'm wondering if the selling of "new" books on Amazon angle is a faster, safer path to laundered money than the usual eBay schtick? | |
| Posted by: ronan on 2020-11-22 17:09:40 Did you have a look here : https://www.abebooks.com/servlet/SearchResults?cm_sp=SearchF-_-topnav-_-Results&ds=20&kn=Macintosh Family Hardware Reference&sts=t ? 🙂 | |
| Posted by: Crutch on 2020-11-22 18:34:44 +1. AbeBooks (which is owned by Amazon!) is the place to get such things. Never Amazon proper. | |
| Posted by: Trash80toHP_Mini on 2020-11-22 19:51:26 Definitely +1 for AbeBooks, looked there first yesterday and search reported the title was sold out. Didn't know Amazon owned them or I'd have been more hesitant to use them in the past. Finally got past my hatred of Amazon, now it's just skin-crawly when I buy from there. This time a couple of Amazon prices are lower: https://www.amazon.com/gp/offer-listing/0201192551/ref=tmm_pap_used_olp_0?ie=UTF8&condition=used | |
| Posted by: Kai Robinson on 2020-11-24 07:17:47 Okay, it's done... See pics for details! No boot, but a checkerboard again at least...   | |
| Posted by: ronan on 2020-11-24 07:31:10 Congrats on all the work done ! I'm really impressed ! Good luck for the future of this project 🙂 | |
| Posted by: cheesestraws on 2020-11-24 07:49:24 Well done! I'm lagging significantly behind you, I fear... but most of mine is done too, so I will hopefully join you in checkerboard land shortly | |
| Posted by: techknight on 2020-11-24 08:12:04 Nice! that looks like uninitialized RAM, so the CPU isnt starting up for some reason. Wonder if theres another address/data line that was missed or unconnected. | |
| Posted by: Kai Robinson on 2020-11-24 08:32:08 I just checked the test points for voltages - instead of reading +5v, it's reading +7.5v!!! I think my analog board has potentially killed some chips... | |
| Posted by: quorten on 2020-11-24 08:36:49 Oops, well... actually I'd vouch the essential chips are still working: GLU and BBU for one. You can double check that the ROM and CPU are okay, and if so, that should actually be good enough for initial oscilloscope debugging. | |
| Posted by: quorten on 2020-11-24 08:39:52 Easy way to check the CPU is still working in some vein: If you can trigger *HALT + *RESET and it will respond by de-asserting/asserting *AS after a few clock cycles, it should be okay. | |
| Posted by: Kai Robinson on 2020-11-24 08:40:07 I'm thinking my analogue board is potentially in need of repair as well - seeing as the video is very off centre as well as being wonky...voltages are something i'll have to measure....if only i had an extension cable to be able to test this flat on a bench! Anyone make one at all? | |
| Posted by: max1zzz on 2020-11-24 09:20:12 Very nice! As for extension cables, iirc you can get a normal 20pin ATX extension cable and just use one side of it (I haven't tried this personally though) | |
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