Apple II

Apple IIe HAL equations in vhdl

Submitted by dvador on March 23, 2014 - 3:55pm

I found a file containing the equation for the Apple IIe HAL.

it is in a language I dont understand

do you know if the same file exist in vhdl ?
or is there any information on how to read the file (this is a small extract)

Pin #
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
14M 7M CREF H0 VID7 SEGB GR' CASEN' 80COL' GND ENTMG' LDPS' VID7M PHASE_1 PHASE_0 Q3' CAS' AX RAS' VCC

/RAS':=Q3'
+7M*/RAS'*/PHASE_0
+/7M*/AX*PHASE_0
+7M*CREF*AX*H0*PHASE_0
+/7M*/CREF*AX*H0*PHASE_0

apparently it's just simple equation using just not, and, or...

there is this description

DESCRIPTION:
'=not (inverted)
+=or (# in CUPL)
*=and (& in CUPL)
/=low (! in CUPL)

but it's not so clear, for example the signal on pin 19 is ras' but the the part of the equation is /ras

apparently it is easy to deduce the and / or but with the /signal signal' signal
the not seems comfusing

any idea ?

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Apple II

Come see a Rev-0 in the flesh at VCF east 9.1

Submitted by Corey986 on March 23, 2014 - 6:54am

As I'm finishing up my exhibit for VCF plans I realized some of you may be wondering what makes the Rev-0 so special and different than all the other Apple II that came after it and why do some of us just love the Rev-0. Sure it came first, but it's more than that...

Sure I'll be showing an Apple-1 replica next to a person bringing a real Apple-1.
Sure I'll be showing the Scelbi 8h replica that took me over a year to complete.

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Apple II

II+ Foil Keyboard H--l

Submitted by falter on March 22, 2014 - 7:30pm

Got the parts today that Corey was kind enough to send me (thanks Corey!!!). I decided to go in on my II+ foil tab keyboard. I hesitated initially because after repeatedly fighting it I had finally gotten it previously to a point where the only issues were a dead - key, a space that appeared after 3 was pressed, and a sometimes flaky D. But Corey was kind enough to send me a nice long foil strip so I thought I could pull it off.

Boy was I wrong.

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Apple II

Strange failure on apple IIe motherboard

Submitted by dvador on March 22, 2014 - 3:00am

Hi

I have 2 Apple IIe motherboard and a power supply

when I power the first board, the screen is cleaned and then the simple word "Ram:" is written on the top left corner...
nothing else. I deduced (I may be wrong) that the board is working but lack peripherals and specially a keyboard
(if I remove the 74LS154 decoding the IO I get "Apple II and a prompt"

on the second board, the screen is filled with little colored squares (I guess it's just low resolution) an nothing else.
if I put the rom of the previous board to this one, I columns on screen patterns containing '*'

apparently on of the set of eprom is enhanced the other set standard

any idea to what I should look to solve the problem of the board with the screen filled with colored squares ?

I try to swap many parts without real success...

any idea ?

thanks

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Apple II

Compatiboot?

Submitted by Keatah on March 21, 2014 - 11:52pm

What are these Compatiboot (no FASTLOADER) disk images showing up on Asimov?

No fastloader, but yet they load superfast. And what does "compatiboot" mean anyways?

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Apple II

Apple II late 1978

Submitted by Cosmo on March 18, 2014 - 2:44am

Some pictures of recent finds. Finded an late 1978 original Apple II and early 1980 Apple II europlus among with some cards.

The 1978 Apple II does have however Apple II badge wich i'm in a process of replacing with the original badge.

Oddly the 1978 Apple II had one Integer ROM chip and others were Applesoft II ROM's. I borrowed the ROM's from the Europlus, cleaned it up

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Apple II

Funny smell Apple IIe power supply

Submitted by javster on March 14, 2014 - 12:15am

I recently got an Apple IIe enhanced from a friend who asked me to clean for him.everything went fine, but while trying to run a diagnostics program I thought my wife was cooking, a sweet burning smell began to come out. I then realize it was the IIe, and immediately shut it down. Mi afraid to turn it on again, what can it be? Can it be repaired?
Ranks in advance.
Javster

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Apple II

Lots of Apple II topics @ Vintage Computer Festival East - April 4-6

Submitted by evank on March 11, 2014 - 11:40pm

AppleFritter'rs: there will be lots of delicious Apples at the VCF East this spring! A real Apple 1, an homebrew Apple II sound card, a lecture by Franklin president Joel Shusterman, and several examples of rare Franklin prototypes are all on the agenda. Read on for more info....

-------------------

The Vintage Computer Festival East returns on April 4-6, at the InfoAge Science Center, in Wall, New Jersey. It is hosted by MARCH: Mid-Atlantic Retro Computing Hobbyists.

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Apple II

SSC II and ADTPro not working

Submitted by falter on March 11, 2014 - 11:33pm

As I was going through a lot of Apple stuff I bought from one seller, I found an Apple Super Serial II Card among the pile. I had previously been using my Apple III to write Apple II disks but I think it is going flaky (like sometimes it will 'remember' things you typed at various prompts in ADTPRO and then repeat them at another prompt, or the drive writes the first couple disks ok and then starts coming up with 'bad sectors').

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Apple II

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