Apple II

Trying to burn a F8 ROM for an Apple II PLUS

Submitted by A2forever on January 26, 2007 - 9:53am

Need some help guys , can someone please tell me what type of Eprom you use in an Apple II PLUS for the F8 ROM , I am trying to burn a new one and it does not work at all , if there are any kind of modifications , that would be nice to know also.

Thanks.

A2forever

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Apple II

Pig-Font & Lowecase Chip for the II PLUS

Submitted by A2forever on January 25, 2007 - 12:30am

Hi everybody.... Just thought I'd post this , was pretty interesting to see it work at all! I burned a working Pig-Font Chip for the II PLUS , if you don't know what a Pig-Font chip is , well is a Character Chip for the II PLUS that is Enhanced , has some really kewl characters added into the chip , Example... There are Skull & Crossbones , little Piggy characters , etc.. PLUS! It has all the Lowercase characters as well! I am working on a few modified Non-Autostart F8 roms right now , they seem to work quite well in Apple II Oasis Emulator...

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Apple II

Hacker Emblem

Submitted by mmphosis on January 23, 2007 - 5:22pm

Here is a smattering of code written with Applesoft BASIC...

Hacker Emblem

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Apple II

Strange data bus waveform from II+

Submitted by jaksel on January 22, 2007 - 4:38pm

This is an image I took with a digital oscilloscope, showing the D0 (data bit zero) signal plus some address bits on my Apple II+:

http://www.applefritter.com/node/20136

The logic high level looks really terrible. It is usually around 3.5 V, with occasional spikes at 5 V and occasional drops to 2.5 V. I checked on my IIe, which looks much better. Can anyone tell me if this looks OK, or should I assume something is very wrong?

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Apple II

Help needed with Apple //c

Submitted by sonnyhung on January 22, 2007 - 11:49am

Hey! I'm placing an SOS Call out for any assistance!

If you're in the NYC area with a working Apple //c Power Adapter Brick please contact me!

I recently acquired an Apple //c without the Power Adapter Brick. Can anyone loan one out to test this Apple //c to see if it boots up fine or not? If it boots up then I'd be in the market for the Power Adapter Brick for it... but for not I'd just like to see if it works at all.

TIA

God bless,
Sonny

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Apple II

Is it possible to play Apple IIe disks on a new Mac?

Submitted by J_Cangelosi on January 21, 2007 - 1:22pm

I have an old Apple IIe with all of the old floppy disks. I am planning on getting a new Mac, but wanted to know if there was any possible way to play those old floppy disks on a new Mac. The disk drives are not built into the computer (as any Apple //e person would know) and are able to attach to another computer. Any suggestions? I am willing to buy anything to play them on a new Mac!

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Apple II

Typical PROM output levels?

Submitted by jaksel on January 17, 2007 - 4:41am

Does anybody know the typical output high/low voltages for the Apple II PROM's? Mine has Voh of 2.6-2.9 V, which seems low considering the 6502 has minimum Vih of 2.4 V.

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Apple II

Raycasting 3D walkthrough demo

Submitted by resman on January 17, 2007 - 2:57am

Here for your enjoyment is a technology preview/demonstration of a raycasting and rendering algorithm I have developed as part of my Apple II 30th birthday-retro-game-just-because-I-can thing.

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Apple II

My limping Apple II+ - yet some kind of hardware problem

Submitted by jaksel on January 13, 2007 - 12:21pm

Yesterday I finally got the NTE6889 transceiver ICs, that were going to replace the faulty 8T28 IC's in my Apple II+. However, when trying to boot from disks, my Apple still crashes. And NO, it is not a disk problem. I have tried moving the disk drive + floppy to another Apple, which can boot fine.

My Apple will crash only after reading the floppy disk for some time. Different floppy disks will make it crash differently, but it is always the same type of crash for a certain disk. E.g. if I boot my DOS 3.3 system disk I get this:

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Apple II

Difference between european/american Apple IIe ?

Submitted by jaksel on January 5, 2007 - 8:27am

I am looking around for an Apple IIe, but it struck me that I don't know about differences between american and european IIe models, except for the AC rating of the power supply. Are they identical, or can the american model be mod'ed to fit european video standards (as on the II+)?

Anyone happens to have an old IIe for sale?

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Apple II

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