I'm running into an odd problem. My Apple //e won't load any ProDOS disks. I've tested each disk on my //c, and //gs, and they work fine, but if it's ProDOS, my //e won't load it.
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Posted Fri May 18, 2018 12:43 PM
Occasionally it will simply say "Unable to load ProDOS," but most of the time the disks actually load for a few seconds before stopping, and displaying some odd text at the top of the screen. The errors are as follows:
ADTPro/ProDOS Master/Pasport Utilities (5.25 Disk II, Slot 5, or 6):
0DF8- A=10 X=C8 Y=C4 S=F5 (or S=EE)
AppleWorks 4.0 (3.5 UniDisk, Slot 6 only)
0C90- A=00 X=C8 Y=00 S=F3
These disks also display "APPLE II" along with the version of ProDOS, and a date in the middle of the screen, and Apple copyright info at the bottom.
Bank Street Writer Plus (5.25 Disk II, Slot 5, or 6): tree bwoop sounds (I really don't know how else to describe them), and then:
0C7F- A=00 X=C8 Y=C4 S=F5
There is nothing else on the screen.
Bank Street Writer III (5.25 Disk II, Slot 5, or 6) gets nothing but bwoop sounds, still no picture (not even Apple //e).
Some others (usually macros add ons for AppleWorks) it just spins the drive, and nothing else. Apple //e remains at the top of the screen. This is only with the 5.25 Disk II.
All these disks have been tested on my //c, and //gs. AppleWorks 4.0 has errors in load, but the //gs can work around them. The //c not so much, but usually I get the expected "Unable to load ProDOS" message. Also the bwoops from Bank Street Writer III are present on the //c, and //gs, but the program still loads. Bank Street Writer Plus loads without issue.
Also I have tried not having both controller cards installed at the same time, but the malfunctions persist.
Edited by DistantStar001, Fri May 18, 2018 12:46 PM.
Posted Fri May 18, 2018 9:12 PM
Which version of ProDOS and is the IIe enhanced (65c02)?
ProDOS 2.x (well, classic versions, not the new 2.4+) required a IIe enhanced, while 1.x will run on an original IIe, or a II with language card.
Edited by R.Cade, Fri May 18, 2018 9:13 PM.
Posted Sat May 19, 2018 12:12 PM
This is a //e enhanced. Anything after v2 seems to be giving me problems. I found an old apple //c tour disc with v1.1, and it booted fine. Interestingly, when I bootstrapped ADTPro with v2.0.2 over the cassette line it booted from a v2.0.2 system disk without a problem, and Bank Street Writer Plus gave me a splash screen. After that, it was acting up again. It took me forever to get it to run an internal diagnostic (even without the keyboard plugged in), but eventually I got it to run, and this is what I got:
I'm guessing that means one of my ram chips is bad. Also, given that there are 8 chips, and 8 digits, can I assume that my //e is trying to tell me which one? If so, then is it the second from the right, or second from the left, when the keyboard is facing towards me? (7 or 12 in fronton it?) And finally, if this assumption is correct, where do I go to get a replacement (other than another //e)?
Edited by DistantStar001, Sat May 19, 2018 12:22 PM.
Posted Mon May 21, 2018 7:51 PM
I replaced the RAM chip, and on the last diagnostic it gave me an MMU error. It loaded a ProDOS startup disk, but when I tried Bank Street Writer Plus, it loaded the splash screen, and then it just spun the disk, and nothing else. I tried the backup disk, and I got a similar error listed above. After that, *UNABLE TO LOAD PRODOS* on everything I tried.
The MMU seems to be a much harder component to find, but I think I might have located a generic substitute. the part # is 8250, and is described as a "8250B COMMUNICATIONS INTERFACE-40 PIN DIP PACKAG" (sorry about the uppercase, I bitterly just copy/pasted from the website). From the picture it seems to be the right size, and has the right number of pins, but I'd still like to know if it's the right part.
I'd post the picture, but I'm not sure if it's copyrighted, so this is the url: https://www.electron...cts/CHP8250.jpg
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