From 1f3238ccad6e17a91e0b5ca6619f4ec84766cd7a Mon Sep 17 00:00:00 2001
From: FeralChild64 <you@example.com>
Date: Fri, 4 Oct 2019 21:44:58 +0200
Subject: [PATCH] provided unofficial $E50C routine - for compatibility

---
 STATUS.md                          |  25 +++++++++++++------------
 bin/basic_mega65.rom               | Bin 8192 -> 8192 bytes
 bin/kernal_generic.rom             | Bin 8192 -> 8192 bytes
 bin/kernal_mega65.rom              | Bin 8192 -> 8192 bytes
 bin/kernal_ultimate64.rom          | Bin 8192 -> 8192 bytes
 c64/kernal/e50a.interop            |   4 ++++
 c64/kernal/{plot.s => e50a.plot.s} |   5 ++++-
 7 files changed, 21 insertions(+), 13 deletions(-)
 create mode 100644 c64/kernal/e50a.interop
 rename c64/kernal/{plot.s => e50a.plot.s} (64%)

diff --git a/STATUS.md b/STATUS.md
index 01af1e7c..d5178191 100644
--- a/STATUS.md
+++ b/STATUS.md
@@ -136,7 +136,7 @@ NOTE: Even the 'DONE' routines won't support features described as missing in on
 | `$FFE7`   | `$F32F`    | `CLALL`     | DONE     |                                                    |
 | `$FFEA`   |            | `UDTIM`     | DONE     |                                                    |
 | `$FFED`   |            | `SCREEN`    | DONE     |                                                    |
-| `$FFF0`   |            | `PLOT`      | PARTIAL  | cursor blink not handled                           |
+| `$FFF0`   | `$E50A`    | `PLOT`      | PARTIAL  | cursor blink not handled                           |
 | `$FFF3`   |            | `IOBASE`    | DONE     |                                                    |
 | `($FFFA)` |            | NMI vec     | PARTIAL  |                                                    |
 | `($FFFC)` |            | RESET vec   | PARTIAL  |                                                    |
@@ -150,16 +150,17 @@ Not all of them - only these we want to have implemented.
 
 <br />
 
-| Address   | Name              | Status   |  Remarks                                           |
-| :-------: | :---------------- | :------: | :------------------------------------------------: |
-| `$E544`   | clear screen      | DONE     |                                                    |
-| `$E5A0`   | setup VIC II & IO | PARTIAL  |                                                    |
-| `$EA31`   | default IRQ       | PARTIAL  |                                                    |
-| `$EA7E`   | ack CIA1 + below  | DONE     |                                                    |
-| `$EA81`   | ret from IRQ/NMI  | DONE     |                                                    |
-| `$FD30`   | default vectors   | DONE     |                                                    |
-| `$FE47`   | default NMI       | PARTIAL  |                                                    |
-| `$FE66`   | default BRK       | DONE     |                                                    |
-| `$FF80`   | revision byte     | DONE     |                                                    |
+| Address   | Name                | Status   |  Remarks                                           |
+| :-------: | :------------------ | :------: | :------------------------------------------------: |
+| `$E544`   | clear screen        | DONE     |                                                    |
+| `$E50C`   | set cursor position | PARTIAL  | cursor blink not handled                           |
+| `$E5A0`   | setup VIC II & IO   | PARTIAL  |                                                    |
+| `$EA31`   | default IRQ         | PARTIAL  |                                                    |
+| `$EA7E`   | ack CIA1 + below    | DONE     |                                                    |
+| `$EA81`   | ret from IRQ/NMI    | DONE     |                                                    |
+| `$FD30`   | default vectors     | DONE     |                                                    |
+| `$FE47`   | default NMI         | PARTIAL  |                                                    |
+| `$FE66`   | default BRK         | DONE     |                                                    |
+| `$FF80`   | revision byte       | DONE     |                                                    |
 
 <br />
diff --git a/bin/basic_mega65.rom b/bin/basic_mega65.rom
index 2b665a44bdbff98f29822d288b4358848a8d014d..a8762c7b25f6d6b3d12cf6b034e59c75f7823a14 100644
GIT binary patch
delta 19
bcmZp0XmHqYk%dkC+tLjR;+wCtXi5VBPjLr#

delta 19
bcmZp0XmHqYk%dj^+tLjRN}I2<Xi5VBP%H<H

diff --git a/bin/kernal_generic.rom b/bin/kernal_generic.rom
index 954448703f6360e140d5439ade471bc779824d85..722812e87e38f179ee9618a45a8c7a232e3b4e53 100644
GIT binary patch
delta 1415
zcmYjRZA@EL7;f)vX<>o2u#GmO<&gQK#Vu=wn`m4_#ZZ@{F(Vo<S#}bBtZ|qulNb^c
z0oPjz3c($w(D_liUP8%Ox?sjyTnxA$D+$^_#@Ga%3zrxc^|rUPY^2op-ojkcoUi-#
zeb4i}&vV*q+G|3;vbr-FK7`I>=scTIk5XsB5pzi6p7+cJ=7;78n$7-o<3z%cwzuKg
zEdAS9L2I=&rGt{s?6(mo-xt%Z^qE}T1!6+iBzjS6X=@Gmh6Z_m1K}f4CdLM{gzqJz
zs-=9?ty;4G3j^uZUFl#hf69=a4yFgDE@!_J)n|}34I}Q_L?n*%>0TD668Q+5R-WG1
zZ~<Jq+PdHzHL-<eR@AtfO{@#oZOSF|-KxDy`3AYrA95k?j+|Q0d!wv)0O{%Ryreog
zR;NobuW;AhVNWDi+OdLOkl_CY7WZwU*V86^Lqca);R25n`63rUwW}c(KNLvR(3=+}
zB2!IFWbBiI*}ONnarcj&34;A{eaD7OiKwXtE?i1#eJi?`fQ;x~#&3j(O2f|SSQ=GG
zXhuN)ticz*E~s)s5G~Q}BQt`_#syr%t`R<9BKS2KdGKX?YE^;JiZm&IR>`7+EH=2T
z4cOubfUFRU>eIY8x0;CuRop<3<-7#rHMq3Gq=*}6S@B1<m)1hBhMO2Uv<&ixKVYIH
zmWNt4aU`L=zl9b(6lkOv>7kmvMtnr*gW}^%JWh|4yx9h=VN3*V2ufZ)j84c@r4mS;
z#Ggq}dXAgN`-JVfWb6LOl9B1i^yZ=W;xMC<G*IBz@quGpAe0A;;0Kb-6(|8d)n}#+
z%QgkCK|dW^cgW2FxIVM$=D29QI&tgfxGAQth6`VlFq=d(ak_Vx&0!XNazOso2@vls
zT$d#Lw}uV>PM(U4zZ97TzYPX{3N+78Vi5j^yN)#~SUky~Du>0B1T28*e3Fl#9V^Nz
zNEB+6HM$+o&8Ou#kr)b#3^$3M-c6x*l5jxx?5;Qp)V3!B{bE6<LwC24iLIMRH37*N
zNnHrKaR|B*Rf~=&Bkm73%F6>={V9avv}Jcy8$|t{i&})Jg{VsW6C%aMCvh7>XbMiy
zh!l#zA?Gz=_geEI_KA$|Ll=mzpwo~cz1p(xzp<8o*Ky&iulonQ7oo@ho70}|2IKTQ
zmFvnGf6iiae#$kBsw7+_(er!W)oK&CR-mVhP1XFD22C&vaDplVaPaAPtJ~)p<iP$>
zO$dAvEe}0b+;7M^Qm$pN-=T*~4_ZOnC%4UYI}WeHWjAx>97DcvGd<^+v9qN?Ez_By
z7Rz(xU8%w>3%_ks%`GdYN}%V#23?!<my#-a$#Ph2rFShYYCC<)ie5aKYG`JBBjAfJ
z&}uNJY|u3bg@8!=WSfDEt?BIzNSGfGjqpwkTYo4zm<l3z^A`MBZ!5CX_sc7v9g(mx
zft%9!HvxaVjt7(YQ3`)9;QBP4iQ^3c?^wZ;0zSHm-=;s6Tb{|L@O7ct#x_^7&HGtw
WNnnqF3k2VyUqw_Z%Suyrarr+bBAR*t

delta 1413
zcmYjRe@Gi=7{1))hdQ*UYxP`>ev%EMYp2v9I#%Y^K|=erxR#DO82doR!pLB(GTa7J
zyIfXWC(g60+Wm+}PE2Vf#er2fwz~e&2<w81Rk5oZNf?D~mt4%*mLz-cqNQ+r?|1LL
zeBbjv&+}e)OLt4~cgAu{k%H)!A}llM7GJ?xHcdioKZ8?=e1gxVd!0khyiRm2icYF%
zEiD#bq3+bOyXM0xs#efK6fH*Ji)aZ@PAC$Fi*1DqQJ0<fyT)CYBtIt{GQC`OKjkYI
z?Zhb!hApu{&c&Z69CD<DizaIqoLAE#-zQpBzohPvPQPz#R1!~VnS2D9n*X$PzvZ%r
zp7@L==R9;Dgnr9J4}JLzP5OH1J_v|Y5v}HcBTUl%A-Ujey=AqH4sUU!iD-?W);O}M
zu;RK@=Zf<R#}w`@XJn(x%`q<Q$ndxIcBPRJBkxDFaNL|Uyg2Ewr06Fe10yUM8z(<4
zSTL6rW*K-07Bld<{vqM7d8WNHMCdJTx8XxEe#-NscQ$wPzniF8fhv~4%_(4v!^cvB
z%~V~4@#YTSGIj|SB_G<^Sn!qUb{g6VRzO?R@6jO=HX}m{&m>G6ydN#agA773VWtG-
zK|$ap5K8!~<T(9yT4;Ro=n>$7<_Mx<Ivvt9I+NCS$dJUJE1e#nca#T$(L(m`pWaNc
zYE2hj$ZjkBi>@^2?NIGNlkmQ^;VB<=V@fW*I(zfR6c;u$0Rl$~GfA|T5ccl2*H0*V
zLH^ZQIPoTSB#HDb`%v5^2{J8~p$SE_!y?Ur%cScVtaf_$;WizdHyNOE;Jiry2OtNM
z(hNGG!5v5jh~BHdN8U^>Mk5dtiLq&!=C7m2-{#QCBqW5=J=F(+tL|jKsp9)@DyzQh
zIsf&Aq2ZB>V1Oc}7XiHofZmWnt`E`jzUek?yMLSTLbzP$*wfGjRe$8F)}d-8M9F_b
zrM&*Aj*126AcIyT!5K*MBOLZ@x(_huf`<M<B7Xx^(M_BO{>^7$sksXaxrEx)UJxgc
zlM;jkBFT_bcdT~euUTB~PPxWWgMy2c0L2e#!vuob)SVX?Pu<YgGz{ljy5Ef6h(kor
zsW6bDMe-l!{XsL#CqAvYO*1}xYK_mc5xbbxe3&;M-m2HksEJ%x`ufq2()iV=^c8Ci
zWMN(c6oI=I`DOf1JY)>gO(awmd_aOm&$4&XzdW|6O|xul0w=iiCfS<XT61u8K3j8F
zc&4nb2%P!Wwp+0`Gx<STz(mIs!D@Z}wRhr=&ua_s$4hZ(SaUoB>_{WI-C6=L3<nr~
zggjzZ-Z>G)v>%l@L}UQR38J;pU=voY9foG%SS5O4E_KRH`#^9UjYu;gI?M#JMC#Y4
z5jZ<|Pp6@lwZN~;4m4<HmxkqH82j<cABqN20R%&_B4$TAQM2%FRqeB@5nP<W8&NDr
z@h4k&G>JPh_=_lRSMgc`Q!#uZjX%y{634#@KUZ0w9#wEC>b5iPTE@MP!PW%!MscC)
QTNf!pQT4I*Z0o)M0Vsc$p8x;=

diff --git a/bin/kernal_mega65.rom b/bin/kernal_mega65.rom
index e692530224c01f7400eed964459726f3032d7417..b978c8a2f26bbf456d57a200d054f283880c74be 100644
GIT binary patch
delta 1156
zcmYjRe`p(39KYT*=~CD3(qBnff4tH$({9BQrPP5KN5mk{Dig*gt$R|$GU7i&q2SPp
zy=>G9b#H20tER`@*vSS56}EIva0oMEp)9j*lF2%DFp9d%CAqg5viQAp9m4T=y!U<I
z@8|RRe!e#z9uMp3>Z-FeTH7Dct0z|DX=U|PnxHG?I~Rv7k#&E7uaxQE-cA~Eh56UA
zH0}y@qWT=ZQyNnerxsNC070*o5YMIsY+IhNq~ORpz3U4046#Wx&$OG8f+Fi^ilOB!
znT*avw~V3mZ4_qc4-17@5SI&dmwRUwPxra=Rc97osImFyr1KNW_);Yt{biu1b7#35
zqJTX%yz}F8Ido(l>iuhZ%u04$z*CH*#A$bmnEU|olg0OIGj5N@Noi>ncNuiVd-xT=
zsXdF|T7L-Qod<Fm()NfozpMZZkL^HFXMu_?pdqHtZS0n_kY!dAq&b3d0cuoun)nSy
z+Zx_|{ClSFO^)zRY%3H<zRjn|iW`*;ykxmHxI?-rnr!IY0@b?1=6ynMHSFWFS=!(D
zQZER{`w0kD$*U&Ou*1x@(CZ~s%;96X&58t&Q@yddwT_{G3UZCAyeKKU8x1m?$vJX9
zUqE$qt+CnVu^ml|jobO<EcG`9Ljfbf{dCUUDqlcncxdg<IFcvoS7K4#rc#raeJEha
zL0HsF$Y-lRVjn%yG#IL2isv<M15-Q?fB@Txyt;%g8<m|#D*9LU=(jAjnxcDw`gk6w
z_7zE8S%8nsM8PqW2&4*uRH-VnFU6a?lLwt`??dtGAf@hyGvu}C(dJ!mLiC>-(HV%o
zmg3AcxHU76;^&!u$%$8T`Vt&UbACKgh=qhl-na>hkwooru|xolN9_Ln6Yd6qZk`-H
zJ^C$(o-a^eOBX%Svft&haKxZ%)guk+r((5M_LBjPBV!YZ_<}@5U*IuyDaEe{TA8TR
z^hw{IdhpVrP45Bm_k7(0`2zF+r2qdsAbi!BcC~&p-`?@{ho61^#mwy7m&%M;d%Uma
z`ayo>9@HU=zxrNw@y8y}wzj9XPTEoRq**<H^xP;NZu_V|UjXo8adUKFXrR}(O0pM@
zd&F(vUDTNa7l0|?My}DgC`=Y@Y42(tWTQbzamcEQpF|zsqaAdx9R&{A2V#7}Q3Zh}
z-FKaZ!9wVsmhEnJ*7PEto^JoH{s~({@CUdim*>Xd?ct8zon8ya7(UAI)q8j$kIx(U
zV*?K{yqv}J3|}^|pW$cL>BWwY9rtbggAoe~u^u6|Tfl7=jvKhvNMvM=aNKocq@20^
EA4qK<PXGV_

delta 1193
zcmYk6aY!3?6vxjylW5lJX`*IS<Ig&}#8xIE&Iw~8js^LxD=i&%Q1=7>kuLkAV*}aB
z>X?^_n_&CvHg#@`N3QgSgBuRoxb+XUe=K7KsiLjusKqNq*m_>#{p^Bf@8T?jBfPx#
z?)|>+^WN`zTY6ix`P>3@C-dm$SyN=ei}+544wQD$Hb)D8L#Gi({fjCm%}a~;ug!!w
zBw)+TH}H8D8#dhib*_77__=K#X(H&uUF2bV@fInD7dGiVN5C6q189P&_oWzG*hFIt
zEt`ZMbsov_(38$o&aacNxh(#fAGy_hG{~(69}m)n+{Vd|-7C&~a0VGT3GFI6hol>Q
z@yHYz2n~l2{}8>Dgs>=JuZ2!9AHJTX)sCt{jJK4j1V1OJ8KMjkT2cJL^S5=aHQvR8
zIISE+#^2==WX_379^xs}v8PKD&=`#uSLH!meFcAH(FesRd1;q6dS0)Erg$HLCbGRL
zadh6wTBvgerIYxx<USQ*zo>ai%KZ$zzbm_xSi2O{oT!uGl_aP{uWlhfUGtPUycTv_
zH0?RWFPqfo4b(5KN4Z<qjRW#8Xo81f{D#|7MEO=s%Y_Oxc)1KMt;+%UQD)F#OPR)p
z>3iPe^;u1kl*;XCiljggXuF(JrqHUMwN#QNpS96xi<;h0E41F50(^C8axf#nLx5>P
zasUCUdO(%PG3pY$aV&nuHf#TbcMwWyKJcMwon9z8dJ(e!+{<2p?7IohSc9ms@-%;f
zX)|_yEU8U_QyTT*zO8V*fFd@*f6V;*K#ai2_|c9%*SsF|)}{^WiG^BO02smMUFp8o
z{R8k1vi(1>f!m?>c6zAP+mYANcPla*tsHX2y~3qg&GFOhh*#(rw*%Qtfr>A0$QkIh
zMs)o?2Q|HxUH7R1BTGjU@E9X7M`wZ<d=v2z`a<cOfstL@rYo1kTr~q5u5twG1Y3+J
zq^B<$8JFY^(i4kb9am_k^jSB=^2OlNAh$}Z%bE*dk>1{~4cOl)3kHJr2H1!H@1`KU
zp$|FAzaR5ge)q|jUwu71GWyNrA7yVi_-2b%R5Tn|Ti0^?79;bq#jEr5Y{jRIK?Wy@
z>HYQq6##p%BNu_YMl6ITQB@Ll4ptB%vP<Pcz>}8xt4lgrcR-5SJe8P_gtAwufgbmx
z<{7Ia%txc{esPC{lq*JV6Vj61L>aMfjex>T8Qrs%O_;)nDoCRcG>VXiUi1H4aM@B3
zd^hgOnb989K+jdy9+}qh1%|(1cwrllr|{of_;VeH8D2K=1jDO3E;8}$O?tDk^0^#_
h-7Fjs!Zkwpn1Cxx9MSQqo#=|p5srJTcV$j&{0j#QGm`)S

diff --git a/bin/kernal_ultimate64.rom b/bin/kernal_ultimate64.rom
index f2e21005026ff3e59d38c8ed18af75497f4ee32c..0eff723afeff861635a9c4e4cc2e400ea86b647e 100644
GIT binary patch
delta 1372
zcmYjRe@q)y94~jY1(J2guhB*dZ*G|dM$&*;(6ESxXhWWxanUf7#g`B#Suk0Y82rb9
z>s5l2R39qTUr>9<E!%PildWvVjQPh(f)dCWE~uN~%!G*7UfYA=QNMQuvgGpKyL;bz
z-_Q5+{d`_`Q+Jc}3u`~E3lci5(|K0Uxk!Blhg?#we?Bl5nID}aXf|{IhZ6}-t2%>c
zGxVRry|mfd#Jm!x0c)K%XusfRE}dn_IX}}6Q_y~?hq>?`L;8D|ewg}vgFbXjN2@6q
zao;Ab-}7>bHG!LD{<g7~Cxl|GQi~k)MO%`|PmlZTDduVZia#2d$o_moMNg;~Ex&Or
z9@s>!niI2|=*{IIiytKN6+VKRmn9Z2$Rx%EZ84%S4a7;t-z}K674w(<*8*1w4sVJU
zevY5V`()Zyc<LyM>*7=R^<@)47n)bY8Awpg*{5bS4`lHGP+<r;G>Ju>nh?sarsHtR
zkjU~Of^iD6u{aF~@H@1;=<UZEQ_?fhHpU1ohx4OvFflS?L!Fy=B4NF|1rsgMXwlw0
zNLJOPtP}cY(GlC<D#7tMJyiUBtwRekPJ-4`=FvhFoiNHwCs0ljzi)8h-5_0&;n5Kx
z+)Ak3cAy5n<)aVbxPOg7gMkeCB7;gnZ}d2WZe;L^+CGNrRqRk{PKlG5j?+g<JYJVP
zZ29T3lK<UR=<ZGYT#^W1avR~@0#%rB8FI;C4-CR2h(frIK^bqAw6vPA0!h)5g%wBw
zEP(fMQkX!lw7C+AS*W>2x8m8k#@I_FMxzSDUq=tWO`?~QsD_r7K6)5<>Q0)#z4l*^
zGc#*W(g39(huVjL+B%>%mZNxMjB*evgJta&*}EV&?JTW715v+cqZT1*A!bqTL8P*{
z6Stm{CJk1+nlu3)`H&O)Qyq2ej+pL(B#6N%S9RN9650su1n|&igb$>H*7C2vsHps^
z=aWxA8ypIK{_uWNJs-i%+lsoA0HLB4JzNOKRdc&RS7@(_PHHHVhMllowD{1S1iiLr
zpW~#~?%^ZtW9{dKh?CHJxot;<kGNbh0}O~30u11q^l(8hr;{%KaA1Uo-p6t!ka?_9
zda#A}4+F0-5o2apF++r)VFnX7ftskVtlUsal@Vns#r$hWH%6i2tJ_Yx6(2uaHfUvf
zb?SCMUfGx4m0{sA&6wAP=9Y}opuiTe3i$cw;(Gdx``Oo4Q;>n%AU<J0$!$RY>Frtj
zx^?(zMGxB0hzc`u861S|LZpR{NH(AZdkj|_cLZ!5)2Fy4k7-9PZ)#@EYnUF=_{@8x
zkshf)Pdfi<?O=w_gERZUDq_}KXhBBPaRLq<FsK9<t){kLpnt-UQV4g<SjG2_`?84O
zB3lS&LS3klo~o>_@oKm*fv?E;ri{<6;gKX>PvZ|{+^ON|I9^X-R~qlv@Zn|r0{yYl
lz2B<gZ`BSD+fmJS9AvROfdeuwkcSt;7GkkTYFlP;>3^kPj8*^u

delta 1370
zcmYjReM}o=7%z9U1<cs-H5#Gt;&c`q2_I%b!y++D*35SkU0lG#_$F)#TQD(^7~CHY
zMz1c&8r(Y_)GxU72wmoK2IE%d*U&^u;v_)mBuqC$ahXxCcWsXiul2brEK4r;zVF@h
zJn!%M{hsIPZRu^1eqrs`R8d0LRJzFO`DiYE`|DQ}POCnF=hAdwTL;}^ZDH&h^;#RA
zAI&?(>EtuZjcV<*<pvqDU+iNpoMecvkMY5Rc4&yxhFF|bauFtaU|7yORcHUTota&8
zkR~$V9(JSF7^>IcjlWc>RJ7x<^XRZPfFjZ0O+J7YVn~akC57-2!#GFuhgrE6ar8x7
zoM}!>y6p+(A-F#m!Tr_$o~8@gyC&bxo3j;dNwe?}ETnooquw!IXd|?v;27dBdA{;q
z$z1*LDtbx<Z;r*^sYpvWFq@*=tyTFLC&F9?w~UX{^1?SC|1&B*8|q*nAE_Mj3cbdJ
z$*c|4uHq@hnt>{@NTZ>`svP(qd<GBd^pC;=wz4F_M|8TYX#aD-1>+!)n;BXRp_96~
zLs@bBj>=#5guGJ*o157Hr9lgSwsWHMJh;_sn+M>NzV2+KS;Y=!Nug!MuDZy|sO5)C
za_;9>K(U|j-Z&9I=GKL+B9$4T6h&497rex2&{e#OLEJZr_qCZoyz!tV1H>B#AOPr0
zT%1A&4QOZLL1L<4?vXc@S$#=Z6=ggmGyGNb;AtAY6h}T<Qu4@dV5T=dWG(;nql(H;
z`riNG-0+D1L(n^49Y8>41CSZclIy~Zyff5pY-=~@-2!*h?vln6VD($ZY8kAqhb{6g
zu#}hY+eM<%G<-qFQ_>WC<oyopNpv-^=$rxmo|1bLL?AtZ(eW`6^ap0Ef6vqjFl*LR
z5Beqw!lQH&9nxG-g2QgJNR6mlzE5LkvU378syJVzx2=a7-_r4(=!PS>fa71fPylgj
zxUDm@8mdy!go-X3Aq9KT;)b}iecSe<6Kbc64;VU%0S6J^<FbQkXn>%F03FzuG?2B(
zcMY}Y`9=J9ESxPdO(a|?-6K-AXVE(!SR9`xZt<*~-Gu(rJIyNLsw0pM5vRh;EE`M{
zafs07((+29{9ZL>lUVFcL0ew%Fc<q7GU#D^{mf*4>9CbqRjJeY<O{b}9&FMUK7bcu
z;)qe@EcBu1&+L{IKsFL&c|W<&t-N`I7A4RuwlI+avV#iFy+`Ub$cS6tKxuHEX*j2z
z(*u+Z*-&>1Rut2LEWs`Y_VEG92Has+%3u{{0{m)?&2TF&A#KFUnVDUyGujk1a+`C*
zO%GI{r#q5uUCbz0)U6vR%uz!?^$n4B-!a{5I6KJW0(V1WaYQbF5i(KnMSf#4h+wW=
z7t;P7<fg|eYo0is!UYQM*6@!}Jh+C(;`nY7zZ=DeHN2$YNE9E`akGZURQxmjw$l0N
k%Q5^<qRYj0)v#SVS?pA>H;T)&(PhCxEEfA}N4oXS|CzIu&j0`b

diff --git a/c64/kernal/e50a.interop b/c64/kernal/e50a.interop
new file mode 100644
index 00000000..392ddf02
--- /dev/null
+++ b/c64/kernal/e50a.interop
@@ -0,0 +1,4 @@
+The original reason to move PLOT routine into its original position was to provide support for unofficial $E50C address:
+
+- it is well known: https://www.lemon64.com/forum/viewtopic.php?t=3296&amp%3Bstart=15
+- 'Duotris' game calls $E50C during startup screen initialization
diff --git a/c64/kernal/plot.s b/c64/kernal/e50a.plot.s
similarity index 64%
rename from c64/kernal/plot.s
rename to c64/kernal/e50a.plot.s
index 0f439cde..e72b33d2 100644
--- a/c64/kernal/plot.s
+++ b/c64/kernal/e50a.plot.s
@@ -11,6 +11,10 @@
 PLOT:
 	bcs plot_get
 
+	// Note: the 'set' part has to start from $E50C, as this is a known address
+	// - https://www.lemon64.com/forum/viewtopic.php?t=3296&amp%3Bstart=15
+	// - 'Duotris' game calls $E50C during startup screen initialization
+
 plot_set:
 	sty TBLX
 	stx PNTR
@@ -23,4 +27,3 @@ plot_get:
 	ldy TBLX
 	ldx PNTR
 	rts
-