I thought the machine I have is an Apple II. Then I thought it was an Apple II with updated II+ ROMs. Now I don't know.
The machine boots up (thanks for all the suggestions!!) with "Apple ][" on the display and a "]" prompt. This an Applesoft BASIC prompt, not Integer BASIC. That is what I'd expect on a II+. I naively tried the various keyboard tricks of escaping/switching to INT Basic- no go.
What do I look for to determine if this is a II motherboard with II+ ROMs, or really a II+?
What else I know:
** It ain't a Rev 0 board (based on http://www.willegal.net/appleii/appleii-first_page.htm )
** The center of motherboard has a "1978" printed below the "apple computer inc" text.
** The board has a hand-marked as 7928 (serial number?) in the corner near the power connector.
** In Apple's Model number scheme, A2S0xxxx is a II, A2S1xxxx is a II+, right?
** The case sticker has a X-mark next to "A2S0016" (So it's a II ??)
** The same case sticker gives a serial number of "A2S1-61847" (So it's a II+ ??)
** In locations D1, E1, F1 (where it says "Memory Select") it has the 3 chips/plug-in-things on each is printed "16K 16K 16K"
** The ROMs have manufacture dates of 1978 (if I read them correctly).
Some commentary (see the note from vbriel) here:
Practically the only difference between a ][ and a ][+ is the ROMs. If this Apple II FAQ is to be believed some "Original" ]['s and early ][+'s actually shipped with the same revision motherboards. By that standard then if your case lid doesn't say "plus" in green type under "Apple" then you're probably perfectly justified in calling it a ][. It's just not an early one, and thus you're probably not going to get *MILLIONS OF DOLLARS* on eBay for it.
As for trying to switch it into Integer BASIC, do you have a ROM card in one of the slots? Without that card in *hardware* an Apple ][ only has one BASIC at a time resident on the motherboard.
Of course, I've owned a grand total of one Apple II machine (a Plus), and that was years ago, so what do I know.
from Apple II History
- the strapping blocks that had made it possible to use either 4K or 16K RAM chips on the original Apple II were removed.
- the Revision 0 board had only four colors (green, violet, black, white)
- The "color killer" circuit they added fixed things so that non-graphics text would display in black and white only.
Well- The model/serial numbers indicate it's a II with II+ ROMs.
I forgot to mention-
** it has both 8T28s at H10/11 (see http://www.applefritter.com/node/23664 )
** the original owner didn't have the original lid. We was using an ill-fitting IIe lid.
** I don't have a ROM card (which would have the Integer BASIC ROMs)
Since then I've found-
** It's a Rev. 4 board (look through the lower hole of the Slot 4 connector)
** Motherboard part number is 820-0001-04. Found under the 6502. The -04 also indicates it is a Rev. 4 board.
** It looks like this board is a II on the edge timewise. To quote Kevin at http://mirrors.apple2.org.za/ground.icaen.uiowa.edu/MiscInfo/Hardware/IIMBrevisons :
Anyone have a source for Integer BASIC ROMs? I figure I own the machine, I can legally get original/copy ROMs.
This number means it was produced the 28th week of '79.
Sure, it's right on the DOS 3.3 System Master disk (INTBASIC). However, finding old PROMs and a burner might be difficult. Luckily you can find pre-burned ROMS here:
Can it be run from the disk or does it need to be burned to ROM?
INTBASIC can run either way - ROM or disk.
To run from disk, you will need a 16K RAM card in slot 0. It will function as a ROM card after the DOS System Master has copied the ROM image into the RAM card. Switch back and forth with the INT and FP commands.
EDIT: note this works either way; when booting from the System Master, it will load whatever version of BASIC isn't in ROM into the RAM card. My Apple II with INT BASIC load AppleSoft into the RAM card. My II+ loads Integer BASIC into the RAM card. Pretty cool.
It's very possible the cheapest way to get one of those 16K RAM cards (Also called a "Language Card") might be to get your hands on a complete working ][+, since they as of yet lack the pricing cachet of ]['s. ;^) I'd be surprised if you were to ever fine a Plus lacking one.
It's a fuzzy memory, but I seem to recall that some CPM cards for ]['s that had onboard RAM could also serve as a Language card.
Yup, Integer BASIC works!
I booted it from a DOS 3.3 disk. It automagically loaded Integer BASIC into the Language card. Now I can switch to Integer BASIC by typing INT and back again to AppleSoft by typing FP (for Floating Point?)
Thanks for all the good information!!