Previous Thread
Next Thread
Print Thread
Page 26 of 536 1 2 24 25 26 27 28 535 536
Joined: Mar 2001
Posts: 16,808
Likes: 32
R
Very Senior Member
Offline
Very Senior Member
R
Joined: Mar 2001
Posts: 16,808
Likes: 32
Please do not do a BIOS conversion on the IIgs. The hardware is actually different for each ROM version, although we don't emulate all the differences very well yet. (0/1 are mostly interchangable but ROM 03 and the "Mark Twain" are quite different).

Joined: Mar 2006
Posts: 1,059
Likes: 1
L
Very Senior Member
Offline
Very Senior Member
L
Joined: Mar 2006
Posts: 1,059
Likes: 1
Ok. Should I do a bios select for just rom0/1 then? Or should I leave the driver alone? Also, do you have more info about which IIgs models used which keyboard MCU?

Lastly, what about bios system for IIe or other appleII variants?

LN

Last edited by Lord Nightmare; 05/13/09 12:42 AM.

"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Joined: Mar 2001
Posts: 16,808
Likes: 32
R
Very Senior Member
Offline
Very Senior Member
R
Joined: Mar 2001
Posts: 16,808
Likes: 32
The IIe has no signficant hardware changes through it's lifetime so it can be BIOSed. The IIc did have hardware differences with the BIOS differences, which is why some models don't boot right now.

As far as the ADB MCU, http://www.llx.com/~nparker/a2/adb.html is *the* info source.

Joined: Feb 2003
Posts: 168
Senior Member
Offline
Senior Member
Joined: Feb 2003
Posts: 168
I am not apple IIe expert (I was a commodore guy) but:

"In March 1985, Apple replaced the original machine with a new revision called the Enhanced IIe. This change involved a new processor, the CMOS based 65C02 CPU, a new character ROM for the text modes, and two new ROM firmware chips."

http://en.wikipedia.org/wiki/Apple_iie#The_Enhanced_IIe

Joined: Mar 2001
Posts: 16,808
Likes: 32
R
Very Senior Member
Offline
Very Senior Member
R
Joined: Mar 2001
Posts: 16,808
Likes: 32
Right, but that was a software/firmware change. The hardware was the same aside from the CPU.

Joined: Feb 2003
Posts: 168
Senior Member
Offline
Senior Member
Joined: Feb 2003
Posts: 168
That is my whole point, the basic difference betwen the 65c02 and the 6502 was to remove all the illegal opcodes (since otherwise there was no speed improvement). I have no idea if the pre-65c02 roms had any illegal opcodes in them, but one can be 100% sure without some testing, at least some game software did used the illegal opcodes in the 6502 and stopped working with the new cpu/firmware.

Joined: Mar 2006
Posts: 1,059
Likes: 1
L
Very Senior Member
Offline
Very Senior Member
L
Joined: Mar 2006
Posts: 1,059
Likes: 1
R.Belmont: on that page (http://www.llx.com/~nparker/a2/adb.html), theres instructions to dump the mcu rom for the IIgs rom0/1 and IIgs rom3 machines (the roms are different on those two). Do you have access to a IIgs machine to do that to to obtain one of the roms? also, which of the two mcus is apple part number 341-0024-a?

LN


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Joined: Mar 2001
Posts: 16,808
Likes: 32
R
Very Senior Member
Offline
Very Senior Member
R
Joined: Mar 2001
Posts: 16,808
Likes: 32
manga: the 'C02 also added some new instructions. ProDOS versions 2.0 and later used them to save memory and gain some performance.

LN: I have a working ROM 3 but no way to get data off of it other than by sight. (The 800k floppy drive works but I don't have a Mac of the required vintage to be able to convert that to a PC floppy right now - maybe I'll grab a cheap Classic off eBay or something).

The nice thing about that MCU is that it's the 8-bit parent of the M377xx series I emulated in MAME (except the 377xx added a second accumulator, which is kind of heresy but also useful).

Joined: Jan 2006
Posts: 3,690
Very Senior Member
Offline
Very Senior Member
Joined: Jan 2006
Posts: 3,690
just to add my two cents: I think apple2c0, apple2c3, apple2c4 can be merged to use BIOS (but not with apple2c, due to the lack of IWM), the others may be left separate since they come from different machines, despite analogous but not identical hw (e.g. they have small input differences which would be lost)

Joined: Mar 2006
Posts: 1,059
Likes: 1
L
Very Senior Member
Offline
Very Senior Member
L
Joined: Mar 2006
Posts: 1,059
Likes: 1
Originally Posted By R. Belmont
...

LN: I have a working ROM 3 but no way to get data off of it other than by sight. (The 800k floppy drive works but I don't have a Mac of the required vintage to be able to convert that to a PC floppy right now - maybe I'll grab a cheap Classic off eBay or something).

Why not send me the disk once you've dumped it? I have a catweasel which can read 800k format easily on a pc.

LN


"When life gives you zombies... *CHA-CHIK!* ...you make zombie-ade!"
Page 26 of 536 1 2 24 25 26 27 28 535 536

Link Copied to Clipboard
Who's Online Now
1 members (Olivier Galibert), 30 guests, and 1 robot.
Key: Admin, Global Mod, Mod
ShoutChat
Comment Guidelines: Do post respectful and insightful comments. Don't flame, hate, spam.
Forum Statistics
Forums9
Topics8,974
Posts117,896
Members5,001
Most Online890
Jan 17th, 2020
Forum Host
These forums are hosted by www.retrogamesformac.com
Forum hosted by www.retrogamesformac.com