ROM checksum error

15 posts / 0 new
Last post
Offline
Last seen: 19 hours 45 min ago
Joined: Jun 16 2020 - 16:58
Posts: 90
ROM checksum error

XPS says that my C0 and E0 ROMs are failing checksum check. Should I be concerned about that? I have an eeprom programmer if that helps - but I would need an UV lamp! :) 

 

Offline
Last seen: 4 days 21 hours ago
Joined: Mar 31 2020 - 19:55
Posts: 396
Do yourself a favour: Orer

Do yourself a favour: Orer the //e Enhanced Kit from ReActive Miicro. This will give you not only fresh ROMs, butalso  the 65C02 CPU and the newer char generation ROM, for the full enhancement update. 

Offline
Last seen: 19 hours 45 min ago
Joined: Jun 16 2020 - 16:58
Posts: 90
But I already have the 65C02

But I already have the 65C02 and I have an eeprom burner! 

What I am trying to understand if this checksum error is some sort of an issue or maybe XPS is expecting different ROMs (not sure where it takes the checksum value?). If it is NOT supposed to happen, then I would be happy to re-flash my ROMs with the appropriate versions.

Offline
Last seen: 4 days 21 hours ago
Joined: Mar 31 2020 - 19:55
Posts: 396
tony359 wrote:But I already
tony359 wrote:

But I already have the 65C02 and I have an eeprom burner! 

What I am trying to understand if this checksum error is some sort of an issue or maybe XPS is expecting different ROMs (not sure where it takes the checksum value?). If it is NOT supposed to happen, then I would be happy to re-flash my ROMs with the appropriate versions.

 

 

It may not know how to validate the enhanced ROMs. Is something not working, that requires diagnostics?

 

https://mirrors.apple2.org.za/Apple%20II%20Documentation%20Project/Computers/Apple%20II/Apple%20IIe/ROM%20Images/

BIT
BIT's picture
Offline
Last seen: 3 days 6 hours ago
Joined: May 3 2020 - 11:17
Posts: 42
Ciao Tony,I think you're

Ciao Tony,I think you're making some confusion.I don't know that EEPROMs are compatible with ROMs.It seems to me that even EPROMs have limits with the use of the board language card.I have your same problem and I'm waiting for news from DeanClaxton :)

PS: which eprom programmer do you use?

 

Offline
Last seen: 19 hours 45 min ago
Joined: Jun 16 2020 - 16:58
Posts: 90
Uhm... maybe I am calling

Uhm... maybe I am calling them with the wrong name but those are programmable ROM chips - the ones you wipe with UV light.

 

Timelord

Nothing seems to be wrong, just wondering if this is just XPS giving a false warning or whether my ROMs need some TLC. 

 

To clarify, I did not program them myself, I found them in the machine. But if needed, I can program them myself with my programmer (TL866II plus, BIT. Those chips are 12.75V so I could do that but I'd need an UV lamp to wipe them first)

BIT
BIT's picture
Offline
Last seen: 3 days 6 hours ago
Joined: May 3 2020 - 11:17
Posts: 42
Ciao Tony,all clear! :)I

Ciao Tony,

all clear! :)I thought you wanted to program EPROMs with a "multipippo" :)EEPROMs cancel electrically.Can you read me the code of your EPROMs?I thought I understood that using EPROM instead of ROMs, you cannot read all 64KB using the board language card.Maybe putting an additional signal adapter socket could work.To clear the EPROM, you could use a mosquito net lamp; are there mosquitoes in England? : D5min, check another 5min, check, etc until it is all "1". :)

Offline
Last seen: 19 hours 45 min ago
Joined: Jun 16 2020 - 16:58
Posts: 90
Not sure I'm following you,

Not sure I'm following you, Bit. 

 

But no, we do not have mosquitoes in England! :) 

Offline
Last seen: 7 hours 6 min ago
Joined: Jun 18 2010 - 13:54
Posts: 269
BIT wrote:I have your same
BIT wrote:

I have your same problem and I'm waiting for news from DeanClaxton :)

 

 

 See the update posted in SMD ROM Replacement for Apple ][, ][ plus, ][ europlus.

Offline
Last seen: 19 hours 45 min ago
Joined: Jun 16 2020 - 16:58
Posts: 90
BTW: which one is C0 and

BTW: which one is C0 and which one is E0? (those are supposed to be zero's...)

Offline
Last seen: 7 hours 6 min ago
Joined: Jun 18 2010 - 13:54
Posts: 269
tony359 wrote:BTW: which one
tony359 wrote:

BTW: which one is C0 and which one is E0? (those are supposed to be zero's...)

 Not sure what they're referring to here. The original Apple's did have a E0 ROM, but never a C0 one. That space is reserved for peripheral cards and softswitches, etc.

Later II's used larger ROMs labelled CD and EF (again, a bit of a misnomer with the "C" ). And eventually the entire D000-FFFF space was placed into a single ROM. Apple //c's did have a single ROM that included the Cxxx space for the built-in peripherals.

Offline
Last seen: 19 hours 45 min ago
Joined: Jun 16 2020 - 16:58
Posts: 90
Thank you then I'm starting

Thank you

 

then I'm starting to think that maybe XPS is just expecting a different HW configuration and that causes the error I'm seeing. 

amauget's picture
Offline
Last seen: 3 days 22 hours ago
Joined: Jan 3 2011 - 11:34
Posts: 282
tony359 wrote:then I'm
tony359 wrote:

then I'm starting to think that maybe XPS is just expecting a different HW configuration and that causes the error I'm seeing. 

You are right. After making some tests in Applewin, XPS does not recognize the enhanced ROMs. You can use Master Diagnostic IIe v7 which is able to test both enhanced and non enhanced Apple //e.

shadmere's picture
Offline
Last seen: 1 week 3 days ago
Joined: Jul 6 2020 - 03:50
Posts: 10
I just got the Enhancement

I just got the Enhancement kit from ReActiveMicro and XPS now results in exactly the same message.

 

I actually emailed Henry there and asked him about it, and now I am sort of embarrassed.  I should have spent longer researching it on my own!  

Offline
Last seen: 19 hours 45 min ago
Joined: Jun 16 2020 - 16:58
Posts: 90
That is great to know, thanks

That is great to know, thanks for sharing! :) 

Log in or register to post comments