Apple II

MCL65+ 6502 Drop-In CPU Accelerator for Apple II

Submitted by MicroCoreLabs on February 14, 2021 - 7:43pm

Hi,

 

I thought I would share one of my recent projects, the MCL65+,  which is a drop-in 6502 CPU replacement board which can run either cycle accurate or in an accelerated mode. It uses a Teensy 4.1 microcontrtoller board which is similar to an Arduino, except much faster (600Mhz).

 

The MCL65+ PCB contains the Teensy and the required voltage-level buffers using through-hole logic to make it inexpensive and easy to produce.

 

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Apple IIe Platinum motherboard recap?

Submitted by AlgAppl84 on February 14, 2021 - 10:32am

Hi 

 

 I've just recapped the PSU on my Apple IIe platinum and I was wondering if I should also replace the axial caps on the motherboard? If so where can I get them at a good price since they are very hard to find and not cheap.

 

 

Thanks

Paulo

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Apple II

Possessed ][+ Mainboard

Submitted by Timelord on February 14, 2021 - 7:13am

Here's an anecdote to take to the bank. I have a Rev D ][+ board that was previously damaged and malfunctioned. A while back, I restored it, tested it, did a full burn in, RAM tests, the lot, and it passed them all. I put it into a static bag and put it on a shelf. 

 

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Apple II

5.25" drive works w/ADTPro but not GS/OS

Submitted by djc6 on February 13, 2021 - 4:46pm

I purchased a model A9M0107 5.25" drive off of eBay for my ROM03 IIGS. I've used ADTPro via serial to successfully write several disks, but GS/OS cannot read them. I'm using a box of Dysan 5.25" disks new old stock, shrink wrapped. Double sided, Double Density.

 

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Apple II

Best Openings for Micro-Chess 2.0; what is its ELO?

Submitted by Timelord on February 13, 2021 - 3:51am

I have been experimenting with some modern openings with Micro-Chess 2.0, that tend to work very well with live play, but the software (from 1980) shocked me in finding creative logic branches to defeat or to blunt them.

 

I am curious if anyone has ever proven its ELO (per IQ setting) and what the best openings to use against its logic tree tend to be. 

 

As far as I am aware, and the manual supports this, the user can never play as black, so this rules out some options. 

 

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Apple II

Possible Apple IIe spanish ROM.

Submitted by Ramirofv on February 12, 2021 - 8:28pm

Hi everybody!I recently bought an Apple IIe with the "keyboard switch" underneath, spanish keyboard and -I guess, help me if I'm not correct- SPANISH video and keyboard ROM's. They are labeled "341-0155 revB" for the keyboard and the video ROM is "341-0165 revB" and is mounted in a small daugther board called "AIIE LANGUAGE ADAPTER" (820-094-A).

I would love to contribute this ROM's to the community since -and then again, this is a guess since I'm not expert-, I can't find any mention of them on the web, so I'm under the idea that are unusual or at least rare.

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Apple II

Hot DRAMs

Submitted by Mr.Fix on February 12, 2021 - 8:03pm

Hey all, i have a apple 2+.  I am having an issue with the onboard DRAM on the motherboard.  I have noticed that all DRAM banks are heating up.  I have checked voltage at PSU, and they are within voltage spec (+-5,+-12).   I have tested the DRAMS with APEX diagnostic software and the results are the DRAMs are good (no bad chips). I have taken out all the DRAMs from the motherboard and filled up first bank, and this entire bank is heating up.  Any ideas on what to check?

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Apple II

2716 Char EPROMs

Submitted by Timelord on February 9, 2021 - 5:28am

I seem to recall that 2716 char EPROMS worked on some revisions of the ][/+ mainboards. Which revisions support that? I do not recall offhand what was changed in the char ROM pimnouts.

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