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 Post subject: 901447-18
PostPosted: Thu Jun 30, 2022 3:39 am 
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Posts: 9
First post, so please excuse me if this is the wrong sub-forum.

I have a PET ROM tester board that has a 901447-18 chip on it and i could only find one single reference for that in all of the Google searchiverse.
Maybe someone here has any knowledge about this?
:?:

The tester board is the same as seen here under "Diagnostic Clip/Inside View", a rather crudely made 320370 Rev A:
http://www.6502.org/users/andre/petindex/diag/index.html

The only search result on google is this:
http://mhv.bplaced.net/cbmroms/cbmroms.php

And i just added it to here:
https://www.c64-wiki.com/wiki/MOS_Technology_Products

8) Andy


Attachments:
901447-18.jpg
901447-18.jpg [ 160.43 KiB | Viewed 1004 times ]
s-l1600.jpg
s-l1600.jpg [ 287.07 KiB | Viewed 1004 times ]
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 Post subject: Re: 901447-18
PostPosted: Thu Jun 30, 2022 7:34 am 
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Welcome! It would be great if you could find a way - a safe way - to dump this ROM, and share the contents.


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 Post subject: Re: 901447-18
PostPosted: Thu Jun 30, 2022 3:16 pm 
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BigEd wrote:
Welcome! It would be great if you could find a way - a safe way - to dump this ROM, and share the contents.

Thank you for the welcome.
I hope i can get it out of the socket safely, there is quite a bit of corrosion on the pins on one side.

I have a Retro Chip Tester Pro and it supports the 2316B type ROMs so i should be able to read it out.
:)


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 Post subject: Re: 901447-18
PostPosted: Thu Jun 30, 2022 3:19 pm 
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Sounds good!


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 Post subject: Re: 901447-18
PostPosted: Thu Jun 30, 2022 4:52 pm 
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CybAtSteam wrote:
I hope i can get it out of the socket safely, there is quite a bit of corrosion on the pins on one side.

You might be able to free up those pins by putting a drop of WD-40 on each one using a cotton swab (aka Q-Tip®) and letting it “soak” for about 20 minutes. WD-40 is non-conductive and safe for this sort of thing.

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 Post subject: Re: 901447-18
PostPosted: Thu Jun 30, 2022 11:13 pm 
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BigDumbDinosaur wrote:
CybAtSteam wrote:
I hope i can get it out of the socket safely, there is quite a bit of corrosion on the pins on one side.

You might be able to free up those pins by putting a drop of WD-40 on each one using a cotton swab (aka Q-Tip®) and letting it “soak” for about 20 minutes. WD-40 is non-conductive and safe for this sort of thing.


Didn't have any WD-40 but figured my Deoxit should work similar. Let it soak for an hour and the chip came out smooth as butter.

I ran it through the RCTP several times to make sure i got the same checksum (081c7aad) and then dumped the ROM to SD.

So here it is, i haven't looked at the disassembly yet but i can see some readable text in there so i'm hopeful it worked OK.
:)


Last edited by CybAtSteam on Thu Jun 30, 2022 11:21 pm, edited 1 time in total.

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 Post subject: Re: 901447-18
PostPosted: Thu Jun 30, 2022 11:14 pm 
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Hmm, i guess i can't attach *.bin files?
:(


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 Post subject: Re: 901447-18
PostPosted: Thu Jun 30, 2022 11:18 pm 
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How about a hex dump?

Code:
00000000h: A2 80 9A D8 A2 00 8A 9D 00 80 A9 20 9D 00 81 9D 00 82 9D 00 83 E8 D0 EE A2 12 BD 81 99 9D 8F 81 ; ¢€šØ¢.Š.€© ..‚.ƒèÐî¢.½™
00000020h: CA D0 F7 CA 8A 5D 00 80 F0 4C A9 FF 9D 00 80 5D 00 80 D0 22 9D 00 80 5D 00 80 D0 1A A0 0A B9 B8 ; ÊÐ÷ÊŠ].€ðL©ÿ.€].€Ð".€].€Ð. .¹¸
00000040h: 99 99 DF 81 88 D0 F7 E8 8A CE E1 81 0A 90 FA FE 00 80 E8 4C 4F 98 A0 B8 29 0F D0 01 88 8C E0 81 ; ™™ßˆÐ÷èŠÎá.úþ.€èLO˜ ¸).Ð.ˆŒà
00000060h: A0 86 8C E1 81 A0 08 B9 A7 99 99 E1 81 88 D0 F7 FE 00 80 4C 70 98 8A D0 AA A2 09 BD 9D 99 9D DF ;  †Œá .¹§™™áˆÐ÷þ.€Lp˜ŠÐª¢.½™ß
00000080h: 81 CA D0 F7 A9 00 9D 00 01 E8 D0 FA 8A 95 00 E8 D0 FA CA 8A 55 00 F0 47 A9 FF 95 00 55 00 D0 1F ; ÊÐ÷©...èÐúŠ•.èÐúÊŠU.ðG©ÿ•.U.Ð.
000000a0h: 95 00 55 00 D0 19 A0 0A B9 B8 99 99 2F 82 88 D0 F7 E8 8A CE 31 82 0A 90 FA F6 00 E8 4C B9 98 9A ; •.U.Ð. .¹¸™™/‚ˆÐ÷èŠÎ1‚.úö.èL¹˜š
000000c0h: A2 B1 E8 0A 90 FC 8E 30 82 A2 09 BD A6 99 9D 30 82 CA D0 F7 BA 95 00 9D 00 01 91 02 4C D5 98 8A ; ¢±è.üŽ0‚¢.½¦™0‚ÊÐ÷º•...‘.LÕ˜Š
000000e0h: D0 B0 A2 09 BD AF 99 9D 2F 82 CA D0 F7 A0 01 BD 00 01 F0 17 A0 0A B9 B8 99 99 7F 82 88 D0 F7 85 ; а¢.½¯™/‚ÊÐ÷ .½..ð. .¹¸™™‚ˆÐ÷…
00000100h: 00 8D FF 01 85 AA 8D 55 01 F0 F4 98 9D 00 01 C8 E8 D0 DC 98 5D 00 01 D0 A6 C8 E8 D0 F6 A0 08 B9 ; .ÿ.…ªU.ðô˜..ÈèÐܘ]..ЦÈèÐö .¹
00000120h: C2 99 99 7F 82 88 D0 F7 84 02 A9 01 85 03 A9 99 85 01 A2 07 B1 00 91 02 C8 D0 F9 E6 01 E6 03 CA ; ™™‚ˆÐ÷„.©.….©™….¢.±.‘.ÈÐùæ.æ.Ê
00000140h: D0 F2 A2 07 C6 01 C6 03 B1 02 D1 00 F0 20 A9 FF 91 02 51 02 D0 C1 91 02 51 02 D0 BB A2 0A BD 93 ; Ðò¢.Æ.Æ.±.Ñ.ð ©ÿ‘.Q.ÐÁ‘.Q.л¢.½“
00000160h: 99 9D CF 82 CA D0 F7 85 7F 8D 80 3F F0 F9 C8 D0 D7 CA D0 D0 A2 0A BD CB 99 9D D0 82 CA 10 F7 4C ; ™Ï‚ÊÐ÷…€?ðùÈÐ×ÊÐТ.½Ë™Ð‚Ê.÷L
00000180h: D6 01 04 09 01 07 0E 0F 13 14 09 03 20 33 32 30 33 35 30 05 81 B8 AD 81 B1 B1 A0 82 81 84 14 16 ; Ö........... 320350.¸­±± ‚„..
000001a0h: 20 12 01 0D 20 0F 0B 89 AD 92 81 8D A0 82 81 84 1A 2D 10 01 07 05 20 0F 0B 81 B8 AD 81 84 92 A0 ;  ... ..‰­’ ‚„.-.... ..¸­„’ 
000001c0h: 82 81 84 13 14 01 03 0B 20 0F 0B 12 05 0D 0F 16 05 20 03 0C 09 10 A9 06 85 09 20 85 06 A2 0B BD ; ‚„..... ........ ....©.…. ….¢.½
000001e0h: CF 82 49 80 9D CF 82 CA D0 F5 EC FC FF F0 E7 C6 09 10 E7 A2 0A A9 20 9D D0 82 CA 10 FA A9 20 8C ; Ï‚I€Ï‚ÊÐõìüÿðçÆ..ç¢.© Ð‚Ê.ú© Œ
00000200h: 00 40 CC 00 40 D0 12 8E 00 40 EC 00 40 D0 0A 0A A2 33 8E 78 07 CA 8E 79 07 85 0E 0A 38 E9 08 85 ; .@Ì.@Ð.Ž.@ì.@Ð..¢3Žx.ÊŽy.…..8é.…
00000220h: 0D A2 02 20 3A 06 F0 10 A2 0A BD 25 07 9D CF 82 CA D0 F7 8D 00 E0 F0 FB A9 1B CD FE FF D0 07 A9 ; .¢. :.ð.¢.½%.Ï‚ÊÐ÷.àðû©.ÍþÿÐ.©
00000240h: E6 CD FF FF F0 13 A2 0A BD 25 07 9D CF 82 CA D0 F7 EE D0 82 8D 00 F0 D0 FB A2 06 BD 2F 07 9D CF ; æÍÿÿð.¢.½%.Ï‚ÊÐ÷îЂ.ðÐû¢.½/.Ï
00000260h: 82 CA D0 F7 20 85 06 CE D5 82 AD D5 82 C9 30 D0 F3 20 DE E1 A2 08 20 FE 06 58 20 D1 06 F0 0F 30 ; ‚ÊÐ÷ ….ÎÕ‚­Õ‚É0Ðó Þá¢. þ.X Ñ.ð.0
00000280h: 56 A2 08 20 9B 06 20 29 E2 20 85 06 F0 F3 A2 08 20 A5 06 20 D1 06 F0 E9 A2 04 20 A5 06 A2 0D 20 ; V¢. ›. )â ….ðó¢. ¥. Ñ.ðé¢. ¥.¢.
000002a0h: C4 06 A5 8F 20 85 06 C5 8F D0 03 4C 37 04 A9 FE 85 8F A5 8F D0 FC AA A8 C8 D0 0B E8 D0 08 A2 0D ; Ä.¥ ….ŏÐ.L7.©þ…¥Ðüª¨ÈÐ.èÐ.¢.
000002c0h: 20 9B 06 4C 37 06 A5 8F F0 EE A9 E1 20 1A 07 C9 04 B0 04 E0 05 F0 04 A2 15 D0 E5 A2 0D 20 B3 06 ;  ›.L7.¥ðî©á ..É.°.à.ð.¢.Ðå¢. ³.
000002e0h: CE 13 E8 2C 12 E8 A2 19 20 C4 06 A0 00 2C 4F E8 10 05 88 D0 F8 F0 1B A0 00 2C 4F E8 30 05 88 D0 ; Î.è,.è¢. Ä. .,Oè..ˆÐøð. .,Oè0.ˆÐ
00000300h: F8 F0 0F A0 0A 2C 4F E8 30 FB 88 D0 FD 2C 4F E8 30 06 20 9B 06 4C 37 06 EE FF FF 2C 4F E8 30 F2 ; øð. .,Oè0ûˆÐý,Oè0. ›.L7.îÿÿ,Oè0ò
00000320h: 20 B3 06 A2 22 20 C4 06 A0 FF 84 06 C8 A6 0D 84 00 A9 08 85 01 98 18 65 01 45 06 91 00 A5 00 D0 ;  ³.¢" Ä. ÿ„.Ȧ.„.©.….˜.e.E.‘.¥.Ð
00000340h: 24 C8 D0 F1 E6 01 CA D0 EC A6 0D C6 01 98 18 65 01 45 06 51 00 F0 60 A9 FF 91 00 51 00 D0 33 91 ; $ÈÐñæ.ÊÐì¦.Æ.˜.e.E.Q.ð`©ÿ‘.Q.Ð3‘
00000360h: 00 51 00 D0 2D A2 37 E6 01 A5 01 E8 4A 90 FC A9 41 20 BA 06 8A C9 3A 90 0A 38 E9 0A 48 A9 31 20 ; .Q.Ð-¢7æ.¥.èJü©A º.ŠÉ:.8é.H©1
00000380h: BA 06 68 20 BA 06 A2 29 20 9B 06 85 7F 8D 80 3F 30 F9 A2 31 E8 0A 90 FC 8A 20 BA 06 A2 49 A5 01 ; º.h º.¢) ›.…€?0ù¢1è.üŠ º.¢I¥.
000003a0h: C5 0E 90 01 E8 8A 20 BA 06 A2 25 20 9B 06 A9 AA 91 00 4A 91 00 90 F7 C8 D0 93 CA D0 8E E6 06 D0 ; Å..èŠ º.¢% ›.©ª‘.J‘.÷ÈГÊÐŽæ.Ð
000003c0h: 03 4C 2D 03 A2 22 20 B3 06 A2 1F 20 C4 06 A2 03 20 3A 06 F0 0F 8A 18 69 36 20 BA 06 A2 1D 20 9B ; .L-.¢" ³.¢. Ä.¢. :.ð.Š.i6 º.¢. ›
000003e0h: 06 4C 37 06 CA 10 E9 A2 1F 20 B3 06 A2 2D 20 C4 06 A9 FD A0 09 8C 10 E8 CD 12 E8 F0 0D 20 9B 06 ; .L7.Ê.é¢. ³.¢- Ä.©ý .Œ.èÍ.èð. ›.
00000400h: A0 0A 8C 10 E8 88 10 FA 30 F6 4A 90 02 09 80 88 10 E3 8C 10 E8 CC 12 E8 D0 E3 20 B3 06 A2 33 20 ;  .Œ.èˆ.ú0öJ..€ˆ.ãŒ.èÌ.èÐã ³.¢3
00000420h: C4 06 A2 00 20 FE 06 A9 C0 8D 4E E8 CA 8E 44 E8 8E 45 E8 58 20 85 06 A2 37 A9 7F 8D 4E E8 20 A0 ; Ä.¢. þ.©ÀNèÊŽDèŽEèX ….¢7©Nè  
00000440h: 06 4C 37 06 2C 4D E8 A9 7F 8D 4E E8 AD 44 E8 70 18 A2 09 BD 35 07 9D FF 7F CA D0 F7 A2 1F A9 20 ; .L7.,M詍Nè­Dèp.¢.½5.ÿÊÐ÷¢.©
00000460h: 9D 08 80 CA D0 FA 4C 37 06 A2 33 68 C9 F7 D0 05 68 C9 CD F0 05 20 9B 06 30 C7 20 B3 06 A2 46 20 ; .€ÊÐúL7.¢3hÉ÷Ð.hÉÍð. ›.0Ç ³.¢F
00000480h: C4 06 A2 02 20 FE 06 A9 A0 8D 4E E8 A2 FF 8E 48 E8 8E 49 E8 58 20 85 06 F0 9D AD 4D E8 29 20 F0 ; Ä.¢. þ.© Nè¢ÿŽHèŽIèX ….ð­Mè) ð
000004a0h: B0 A9 7F 8D 4E E8 AD 48 E8 A2 46 68 C9 F7 D0 C5 68 C9 CD D0 C0 20 B3 06 A2 50 20 C4 06 A2 04 20 ; °©Nè­Hè¢FhÉ÷ÐÅhÉÍÐÀ ³.¢P Ä.¢.
000004c0h: FE 06 A9 F7 8D 40 E8 EE 11 E8 2C 10 E8 58 0E 40 E8 4E 40 E8 20 85 06 78 CE 11 E8 2C 10 E8 4C 37 ; þ.©÷@èî.è,.èX.@èN@è ….xÎ.è,.èL7
000004e0h: 04 CE 11 E8 10 35 2C 10 E8 A2 50 20 B3 06 A2 55 20 C4 06 A2 06 20 FE 06 A9 90 8D 4E E8 2C 40 E8 ; .Î.è.5,.è¢P ³.¢U Ä.¢. þ.©Nè,@è
00000500h: 58 0E 40 E8 4E 40 E8 20 85 06 F0 D2 AD 4D E8 A0 7F 8C 4E E8 AC 40 E8 29 10 D0 03 4C 51 04 A2 55 ; X.@èN@è ….ðÒ­Mè ŒNè¬@è).Ð.LQ.¢U
00000520h: 20 B3 06 A2 5A 20 C4 06 A0 00 98 8D 22 E8 4D 20 E8 F0 18 48 20 A0 06 68 A2 30 E8 4A 90 FC 8A 20 ;  ³.¢Z Ä. .˜"èM èð.H  .h¢0èJüŠ
00000540h: BA 06 20 9E 06 EE 22 E8 4C 45 05 C8 D0 DC 20 B3 06 A2 62 20 C4 06 A2 6B 2C 20 E8 A0 04 20 90 06 ; º. ž.î"èLE.ÈÐÜ ³.¢b Ä.¢k, è . .
00000560h: 2C 21 E8 30 08 20 9B 06 20 90 06 D0 FB A2 71 A0 02 2C 40 E8 50 EF 20 93 06 2C 40 E8 70 E7 20 93 ; ,!è0. ›. .Ðû¢q .,@èPï “.,@èpç “
00000580h: 06 A2 6E A0 3C 8C 23 E8 2C 40 E8 10 29 A9 34 8D 23 E8 2C 40 E8 30 1F A2 79 8C 11 E8 2C 10 E8 50 ; .¢n <Œ#è,@è.)©4#è,@è0.¢yŒ.è,.èP
000005a0h: 18 8D 11 E8 2C 10 E8 70 10 A2 75 8C 21 E8 4E 40 E8 B0 1B A0 21 2C A0 23 2C A0 11 20 9B 06 8C C7 ; ..è,.èp.¢uŒ!èN@è°. !, #, . ›.ŒÇ
000005c0h: 05 8C CA 05 A9 08 4D 00 E8 8D 00 E8 D0 F6 8D 21 E8 4E 40 E8 B0 DD A2 7C 2C 22 E8 EE 43 E8 CE 43 ; .ŒÊ.©.M.è.èÐö!èN@è°Ý¢|,"èîCèÎC
000005e0h: E8 2C 23 E8 30 0B 20 9B 06 EE 43 E8 CE 43 E8 F0 F8 A2 62 20 B3 06 A2 05 FE DC 07 BD DC 07 C9 3A ; è,#è0. ›.îCèÎCèðø¢b ³.¢.þÜ.½Ü.É:
00000600h: 90 0A A9 30 9D DC 07 CA 10 EE 30 EA A2 7F 20 A0 06 A9 92 20 D8 E3 20 85 06 AD 41 E8 29 04 D0 08 ; .©0Ü.Ê.î0ê¢  .©’ Øã ….­Aè).Ð.
00000620h: A9 0D 20 D8 E3 4C 23 03 A2 0E A9 14 20 D8 E3 CA D0 FA 20 85 06 F0 D5 4C 37 06 BD 3F 07 85 09 BD ; ©. ØãL#.¢.©. ØãÊÐú ….ðÕL7.½?.….½
00000640h: 43 07 85 01 A9 00 85 07 85 08 85 00 A8 18 71 00 90 06 E6 07 D0 02 E6 08 C8 D0 F2 E6 01 C6 09 D0 ; C.….©.….….….¨.q..æ.Ð.æ.ÈÐòæ.Æ.Ð
00000660h: EC DD 47 07 D0 0E A5 07 DD 4C 07 D0 07 A5 08 DD 51 07 F0 08 E0 02 D0 04 A2 04 D0 E5 08 E0 04 D0 ; ìÝG.Ð.¥.ÝL.Ð.¥.ÝQ.ð.à.Ð.¢.Ðå.à.Ð
00000680h: 02 A2 02 28 60 A2 00 A0 00 88 D0 FD CA D0 FA 60 20 93 06 98 4D 40 E8 8D 40 E8 60 20 A0 06 A2 00 ; .¢.(`¢. .ˆÐýÊÐú` “.˜M@è@è`  .¢.
000006a0h: A9 12 20 D8 E3 BD 56 07 08 29 7F 20 D8 E3 E8 28 10 F3 60 20 A5 06 A2 04 D0 EB 48 A9 12 20 D8 E3 ; ©. Øã½V..) Øãè(.ó` ¥.¢.ÐëH©. Øã
000006c0h: 68 4C D8 E3 86 0C 20 A5 06 A2 4A 20 A5 06 A6 0C 60 A2 00 A0 00 2C 41 E8 50 08 88 D0 F8 CA D0 F5 ; hLØã†. ¥.¢J ¥.¦.`¢. .,AèP.ˆÐøÊÐõ
000006e0h: CA 60 A2 00 A0 00 2C 4F E8 70 08 88 D0 F8 CA D0 F5 F0 ED 2C 4F E8 70 FB AD 4D E8 29 02 60 78 BD ; Ê`¢. .,Oèp.ˆÐøÊÐõðí,Oèpû­Mè).`x½
00000700h: E3 07 85 90 BD E4 07 85 91 60 2C 13 E8 30 03 4C 51 04 E6 8F 2C 12 E8 4C E4 E6 84 07 38 E5 07 10 ; ã.…½ä.…‘`,.è0.LQ.æ,.èLäæ„.8å..
00000720h: 04 49 FF 69 01 60 B8 84 AD 92 8F 8D A0 82 81 84 09 0E 09 14 20 39 97 92 8F 8E 87 A0 89 92 91 10 ; .Iÿi.`¸„­’ ‚„.... 9—’Ž‡ ‰’‘.
00000740h: 10 08 10 C0 D0 E0 F0 38 6A BF 98 EA 38 50 FD 7C 05 07 07 03 08 04 20 42 41 C4 20 4F 4B 8D 56 49 ; ...ÀÐàð8j¿˜ê8Pý|...... BAÄ OKVI
00000760h: 44 45 CF 36 30 48 5A 20 49 52 D1 56 45 52 D4 48 4F 52 DA 44 2D 52 4F CD 31 36 4B 2D 52 41 CD 2D ; DEÏ60HZ IRÑVERÔHORÚD-ROÍ16K-RAÍ-
00000780h: 41 44 D2 4B 45 59 42 52 C4 54 4D 52 B1 4E 4F 20 49 52 D1 57 52 4F 4E 47 20 49 52 D1 54 4D 52 B2 ; ADÒKEYBRÄTMR±NO IRÑWRONG IRÑTMR²
000007a0h: 20 54 45 53 54 8D 43 41 53 53 B1 43 41 53 53 B2 49 45 45 45 20 44 49 CF 49 45 45 45 20 43 54 52 ;  TESTCASS±CASS²IEEE DIÏIEEE CTR
000007c0h: CC 41 54 CE 44 41 D6 4E 52 46 C4 4E 44 41 C3 45 4F C9 53 52 D1 20 43 59 43 4C 45 20 30 30 30 30 ; ÌATÎDAÖNRFÄNDAÃEOÉSRÑ CYCLE 0000
000007e0h: 30 30 A0 44 04 9A 04 E1 04 0C 05 0A 07 AA AA AA AA AA AA AA AA AA AA AA AA AA AA AA 00 98 AA FF ; 00 D.š.á.....ªªªªªªªªªªªªªªª.˜ªÿ


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 Post subject: Re: 901447-18
PostPosted: Fri Jul 01, 2022 12:27 am 
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I also disassembled the ROM, if anyone is interested.

Can i attach text files here?
:?:


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 Post subject: Re: 901447-18
PostPosted: Fri Jul 01, 2022 3:09 am 
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CybAtSteam wrote:
Hmm, i guess i can't attach *.bin files? :(

Embed the binary file into a ZIP file and you should be okay.

Quote:
Can i attach text files here?

Yes.

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 Post subject: Re: 901447-18
PostPosted: Fri Jul 01, 2022 3:20 am 
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BigDumbDinosaur wrote:
CybAtSteam wrote:
Hmm, i guess i can't attach *.bin files? :(

Embed the binary file into a ZIP file and you should be okay.

Quote:
Can i attach text files here?

Yes.


Alright, here's a *.zip with the .bin binaries and the .txt disassembly.
8)

NOTE: I updated the zip file with the new disassembly starting at $9800


Attachments:
901447-18.zip [10.62 KiB]
Downloaded 28 times


Last edited by CybAtSteam on Fri Jul 01, 2022 3:58 pm, edited 1 time in total.
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 Post subject: Re: 901447-18
PostPosted: Fri Jul 01, 2022 3:25 am 
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CybAtSteam wrote:
Alright, here's a *.zip with the .bin binaries and the .txt disassembly.
8)

Looking through the disassembly, i put it at $9000 as a base but that might not be right.

The last 4 bytes have jump vectors to $9800 and $FFAA. Hopefully that makes sense to somebody out there.
:wink:


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 Post subject: Re: 901447-18
PostPosted: Fri Jul 01, 2022 7:37 am 
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Well done, and thanks for preserving it!


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 Post subject: Re: 901447-18
PostPosted: Fri Jul 01, 2022 8:51 am 
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Looking at the absolute references in the early part of the code $9800 might bea good candidate for the origin?


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 Post subject: Re: 901447-18
PostPosted: Fri Jul 01, 2022 3:53 pm 
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Martin A wrote:
Looking at the absolute references in the early part of the code $9800 might be good candidate for the origin?

I agree, the base address looks to be $9800. I did another disassembly with that, see attached .txt file.
:)

PS: I also updated the .zip file above with the new disassembly


Attachments:
901447-18.9800.txt [40.53 KiB]
Downloaded 41 times
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