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Posted Sun Feb 11, 2018 9:14 PM
Posted Sun Feb 11, 2018 11:41 PM
Well, if your EPROM hasn't suffered from bit loss, it's a new one to me. Comparing to dumps I've acquired of Rev J, K, L, and WST, your ROM is least different from Rev J, in four places:
File1=your 1050 ROM Chip.BIN File2=1050-revJ.rom Compare error at OFFSET 0 file1 = FF 11111111 file2 = FB 11111011 Compare error at OFFSET 3EA file1 = EA 11101010 file2 = 46 01000110 Compare error at OFFSET 3EB file1 = EA 11101010 file2 = B6 10110110 Compare error at OFFSET FF9 file1 = 48 01001000 file2 = 4A 01001010
EPROM's erase to FF's (1's), so I would think that if it is suffering from long term bit loss, we'd see random 0's change to 1's. This fits offset 0, but not the other three offsets.
Edited by Nezgar, Sun Feb 11, 2018 11:48 PM.
Posted Sun Feb 11, 2018 11:50 PM
Oh. EA's are 650x NOP's - maybe disabled checksum for development?
This post supports the double NOP disabling checksum, done in the WST ROM, and those bytes compare same with your ROM.... http://atariage.com/...roms/?p=3581252
Comparing WSTR5 not support WD2797 no checksum.BIN and 1050 ROM Chip-from prototype board.BIN... Compare error at OFFSET 0 file1 = F3 file2 = FF Compare error at OFFSET 1 file1 = E7 file2 = F7 Compare error at OFFSET 2 file1 = CF file2 = EF Compare error at OFFSET 3 file1 = DB file2 = DF Compare error at OFFSET 4 file1 = 46 file2 = F6 Compare error at OFFSET 1D file1 = 28 file2 = 38 Compare error at OFFSET 27 file1 = 28 file2 = 38 Compare error at OFFSET 29 file1 = 73 file2 = 71 Compare error at OFFSET 3C file1 = 60 file2 = 5E Compare error at OFFSET 4D file1 = 4F file2 = 4D 10 mismatches - ending compare
Edited by Nezgar, Mon Feb 12, 2018 12:03 AM.
Posted Mon Feb 12, 2018 12:47 PM
Before I start a new thread to ask - does anyone have a scanned version of the original install documentation for the ICD US Doubler? I've only found OCR'd/retyped versions online. Surprising since there's scanned docs for many other ICD products. Or maybe original docs are rare since it was so heavily pirated... There is one on eBay right now, but it's just a photocopy, not the usual pink cover: https://www.ebay.com/itm/302439408036
Posted Mon Feb 12, 2018 3:25 PM
Posted Mon Feb 12, 2018 4:35 PM
ICD did put it in the SDCS manual, it's all there except the cover art. Don't recall seeing it as a standalone manual but why do you need one anyway?
The purist in me thought it would be nice to include a printout with an upgraded 1050. Otherwise yeah, the content would be the same as the SDCS manual, but that eBay auction is evidence they did make a standalone manual at one point.
Posted Mon Feb 12, 2018 7:40 PM
Logical thing is to let DavidMil know to re-post the roms with the pre-pended ff omitted... or snip it off your self and post them..
Posted Tue Feb 13, 2018 12:32 AM
Posted Tue Feb 13, 2018 1:16 AM
exactly, we all see it, we know it's not correct. We personally don't need to know the reason. He should investigate to find a fix. The posted roms should be replaced because the average bear will just burn the rom and it can be a problem, as they won't more than likely know what to do with it. It might not even be in this thread, or on AtariAge by the time they possess them.
I forget what I used to have to pad on one of the old burners. but it's something I remember having to do at one time in my life.
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