demo added

2026-01-13 15:27:31 +00:00 · 2019-04-02 13:06:14 +02:00 · 2019-04-02 13:06:14 +02:00 · 8c1e87a4aa
commit 8c1e87a4aa
parent 0799b327d3
17 changed files with 72 additions and 30 deletions
--- a/README.md
+++ b/README.md
@ -1,4 +1,4 @@
-# Tektronix 4010 Emulator
+# Tektronix 4010 Terminal Emulator

 This is a [Tektronix 4010](https://en.wikipedia.org/wiki/Tektronix_4010) terminal emulator
 for the Raspberry Pi.
@ -54,12 +54,12 @@ If you want to test text output, type for example

 	./tek4010 head -n 32 tek4010.c -noexit

-Don't forget the LAST argument "-noexit", which tells
-tek4010 to stay alive after cat has finished so that you have a chance to look at the output.
-By the way, the "-noexit" as the last argument might also be helpful if you want to
-experiment with other commands. Let me know if you find anything which works and makes sense.
-Because tek4010 pipes from stdout of that program and into stdin of that program, some
-programs will not work.
+Don't forget the LAST argument "-noexit", which tells tek4010 to stay alive after cat or
+head has finished so that you have a chance to look at the output.
+
+If you want to see a demo of historical Tektronix 4014 plot files, type
+
+	./tek4010 ./demo.sh

 The emulator does use "rsh" or "telnet", because historical Unix systems do not support
 the secure ssh protocol, and because ssh does not allow using a virtual emulator such as tek4010
@ -198,9 +198,9 @@ Pack it with zip or something else to make sure that the mailing program does no

 **Screen resolution**

-This tek4010 emulator creates a graphics window of 1024x768 points, which is the display size
-of the Tektronix 4010 terminal according to the manual from Tektronix. Some sources claim
-that actual terminals could display up to 780 points vertically. The Raspberry Pi can handle
+This tek4010 emulator creates a graphics window of 1024x780 points, which is the display size
+of the Tektronix 4010 terminaland the Tektronix 4014 terminal without enhanced graphics module.
+The Raspberry Pi can handle
 sufficiently high refresh rates at this resolution. This emulator makes an attempt to filter
 Tektronix 4014 graphics code with the enhanced graphics module installed, so that such
 graphics codes can be displayed using this terminal emulator, but the lowest two bits of
--- a/demo.sh
+++ b/demo.sh
@ -0,0 +1,21 @@
+#!/bin/bash
+# rricharz 2019
+
+for filename in pltfiles/*.plt
+do
+    # erase screen
+    printf '\033\014'
+
+    echo tek4010 is displaying "$filename"
+
+    cat "$filename"
+
+    # let tek4010 wait 5 seconds (not this script, which just shuffles stuff into the buffer!)
+    for i in {1..100}
+    do
+        printf '\007'
+    done
+done
+
+
+
--- a/pltfiles/barchart.plt
+++ b/pltfiles/barchart.plt
@ -0,0 +1 @@
+7 @&y&T#}@}'H&yHy&@#}@$q@@#}T%e@@#}'H%y&@@$q'H&m&@@%e'HH&y&H%y'HH&y&\m'H#}&@}'_})G-sGs'_#}_$q__#}(S%e'__#})G%y'__$q)G&m'__%e)G'a'__%y)G'u'__&m)G(i'__'a)G(}'__'u)G)q'__(i)G*e'__(})G*y'__)q)G+m'__*e)G,a'__*y)G,u'__+m)G-i'__,a)GG-s(I,u)GG-s(]i)G#}'_})]}+E({E{)]#}]$q]]#}*Q%e)]]#}+E%y)]]$q+E&m)]]%e+E'a)]]%y+E'u)]]&m+E(i)]]'a+EE({)_'u+EE({*Si+E#})]}+\}-D0D}+\#\$q\\#},P%e+\\#}-D%y+\\$q-D&m+\\%e-D'a+\\%y-D'u+\\&m-D(i+\\'a-D(}+\\'u-D)q+\\(i-D*e+\\(}-D*y+\\)q-D+m+\\*e-D,a+\\*y-D,u+\\+m-D-i+\\,a-D-}+\\,u-D.q+\\-i-D/e+\\-}-D/y+\\.q-F0m+\\/e-DD0},@/y-DD0},Tm-D#}+\}-Z}/B-sBs-Z#}Z$qZZ#}.N%e-ZZ#}/B%y-ZZ$q/B&m-ZZ%e/B'a-ZZ%y/B'u-ZZ&m/B(i-ZZ'a/B(}-ZZ'u/B)q-ZZ(i/B*e-ZZ(}/B*y-ZZ)q/B+m-ZZ*e/B,a-ZZ*y/B,u-ZZ+m/B-i-ZZ,a/BB-s.D,u/BB-s.Xi/B#}-Z}/Y}1A*`A`/Y#}Y$qYY#}0M%e/YY#}1A%y/YY$q1A&m/YY%e1A'a/YY%y1A'u/YY&m1A(i/YY'a1A(}/YY'u1A)q/YY(i1AA*`/^(}1AA*`0R)q1A#}/Y}1W}2_(e_e1W#}W$qWW#}2K%e1WW#}2_%y1WW$q2_&m1WW%e2_'a1WW%y2_'u1WW&m2__(e1['a2__(eO'u_#}1W}3V}4^,a^a3V#}V$qVV#}4J%e3VV#}4^%y3VV$q4^&m3VV%e4^'a3VV%y4^'u3VV&m4^(i3VV'a4^(}3VV'u4^)q3VV(i4^*e3VV(}4^*y3VV)q4^+m3VV*e4^,a3VV*y4^^,aJ+m^#}3V}5T}6\.v\v5T#}T$qTT#}6H%e5TT#}6\%y5TT$q6\&m5TT%e6\'a5TT%y6\'u5TT&m6\(i5TT'a6\(}5TT'u6\)q5TT(i6\*e5TT(}6\*y5TT)q6\+m5TT*e6\,a5TT*y6\,u5TT+m6\-i5TT,a6\-}5TT,u6\.q5TT-i6\\.vC-}\\.vWq\#}5T}7S}8[2q[q7S#}S$qSS#}8G%e7SS#}8[%y7SS$q8[&m7SS%e8['a7SS%y8['u7SS&m8[(i7SS'a8[(}7SS'u8[)q7SS(i8[*e7SS(}8[*y7SS)q8[+m7SS*e8[,a7SS*y8[,u7SS+m8[-i7SS,a8[-}7SS,u8[.q7SS-i8[/e7SS-}8[/y7SS.q8[0m7SS/e8[1a7SS/y8[1u7SS0m8[2i7SS1a8[[2q7_1u8[[2qSi[#}7S}9Q}:Y/yYy9Q#}Q$qQQ#}:E%e9QQ#}:Y%y9QQ$q:Y&m9QQ%e:Y'a9QQ%y:Y'u9QQ&m:Y(i9QQ'a:Y(}9QQ'u:Y)q9QQ(i:Y*e9QQ(}:Y*y9QQ)q:Y+m9QQ*e:Y,a9QQ*y:Y,u9QQ+m:Y-i9QQ,a:Y-}9QQ,u:Y.q9QQ-i:Y/e9QQ-}:Y/y9QQ.q:YY/yEeY#}9Q};P}<D-|D|;P#}P$qPP#}<D%e;PP$q<D%y;PPe<D&m;PP%y<D'a;PP&m<D'u;PPa<D(i;PP'u<D(};PPi<D)q;PP(}<D*e;PP)q<D*y;PPe<D+m;PP*y<D,a;PP+m<D,u;PPa<D-i;PP,u<DD-|;Qi<D#};P5|$V#}VB}<D&d$LV(lBl<D*t$LV,|B|<D/d$LV1lBl<D3t$LV5|B|<D#}$V}<D"t$Q0"t(N2"t,K4"t0H6"t4E8"t7[10"t;X12#v"U200(e"U400,u"U6001e"U8005u"G1000
--- a/pltfiles/dafcaf.plt
+++ b/pltfiles/dafcaf.plt
--- a/pltfiles/dmerc.tek
+++ b/pltfiles/dmerc.tek
--- a/pltfiles/usmap.tek
+++ b/pltfiles/usmap.tek
--- a/pltfiles/warandpeace.plt
+++ b/pltfiles/warandpeace.plt
--- a/pltfiles/wizard.plt
+++ b/pltfiles/wizard.plt
@ -0,0 +1 @@
+h e G7yGy=T eTe G"l!Xl"G[l0Xw1HpW#b^"x2E{R#fU$`GpG|Qq]cP#|Y$`3BiFoLpXgY#{Es2_m3CnNeL"{2_u3JV#d4@n3YyXv4HnMvV$cUmYl5S#yUuK"|@{O#v^w6RiOdZ$gZ`7MsI%g6QsSk7@tG&aDt_i8L%x7[kZv8OkU$xBoJg7^b8S}]%p9Wc_$zWmBdDSo[u:OkShGb;@#vCs:Yy9[qUi^m;Ii<@"nLl;Z|:\{IeQfD|9_#aJsIz8]oNa["w\FtBoKpYf9F!vF8O"oBx7MfIaCw6ZyGkGhAt5JoDx4NlJj5CbH!{6ArKp5\xJ~3_"jYlLfF!yGr2_yY"pXrL!~E"f1@l0Yl-\p.G|T#lOo-]l,\`["n-Xl\l'HoSyZ#fWmLm&NdB"yFl'H#d&_bT"|Ww_{'F#aFd&^s%Fs._f-XeP"M{U^#a.Bf-X%m&XgC$m%R#~]|'Z|+Y$sTt\z,@%a+\bPiOwP{X{,IoFo+_iY$p,FfA#~Dz/Ai^e0Sl1EvK$sN|H~Az0]lYg^l1AvAqEiH#wDu0^zW%f/ZmEk.V$~-PxIt,^xZ|Z%`-IfQjPnMBsBzF&`Fu/U0D'|^(d2Gm1ZoHs0\|L)}/I*nA}GUx0Gc1F)pV*sMlV)}2C~G*oBe3AgFlE}2@w3JxO}N+dGi2Bn1\r2En3JqOvJ}2Qz1V,`Rx^-a_dW,~OcEp/M-sMqRiTeVnW{U.tLgY-{[v^w0B.`Cx/]/cV{.\yO2b-TtVj.\j/ErI4f,QgJbA3v+Y0n*RaQ/NtPrKsHyDoCs)XlZhXRc*@.y)^hF-q(\,|ZtXqPd'SJ`F+&X/kAgGaLcRkPlG{%^0b&JRfSlLdAm%VwU|V1cK0~IwOmPdLCf$^iZbX/}\0`_/w%InHjKeLfH.~EyKO}P/gT+&Ls%VmRfTi&Ta%Z*{XxZw_x&I+a[*xOv%\nZj]k&EsPkGeJcPn]eR)|Xm]p'D*fAs])y(Ub]d)A*a(^o)EsJtO(kQ%g*TkLjGbG$|KzTq_pZsM%e)Ef(H`'W$|MuDo&NsEyB}C%`G$~N%gYmXw+Jt*[iZ`+KvH},SgRm[_S'g0LjYqUk\o1Dy0\p1EqM~IwQyV(`T'{W_(b^'h0D}C(h/]nJm.WhObPe/@'|PpUgT&~E.]'fPbO&yVt/@]'g0C(p1E`0Wk[jHrOx/Z)`PiNcT(~^~0K)`-\h.F({R)iPm[p]qR*aM)vFx-ZvZo.B(-\*p.V+aWa/Dl.WyXpRyGfK`-^*|.E+aP*}RtSpV+v/[u0L,bQ+wUz^qY*}\+fT*}J+hHv/[,sMdHfEpEzC+}.TR,sT+~IyA,cBjBb-\+wXvU,`O+mL*wP+z,Y*Ye-Kl,_+mA*|BbJ{+T+nK*J+r*Y*v^+lI,l)\`Z+h*@)K,zEgEhAu(Y.`)D-zEwJw*^z+Rn-MrVzY.eVgZeMp.Z-z/GqEn.\sGkAdAd-ZgTeQaTeIk,_i\`\,}\-jH`Dj+T,yS-dGC,xBw*_}Y-dXfT,|Q-mH,}E-a)\n[gImE|B.rVmShVe^g*Nd+Oe,@cHlOtM}+\/kSpNsR0`N/wWx\0a[/x,D0`I/wLS|YuZ_}-DrDwQnQk^gOj,[aW.zFA/h@jFeI.~EA{*AZ/h^x[rXuPgGcDaIeKgG0l+KwTn_yX1c,A`+UpN`N0*]z+LlK1gHqB2mLk[c,F1xMtLIzB|+RvJmHgH3a,EeQ2|W3gUl\nVvUrNuEmJcEh-F2sViOm,Sr.GzMoO/{Jt-^o.@nOgE.RxW\pZSmMhKcOT,h(W+zO}'[r(JdCjO*}X+pXw)Gy(U,jW*o*PcIg)_)}*GmEuMgUlZzU*a]TnPc,V)yOzArJcEiQ`WlZt-Cy,Y*cV(k+]qPoAh*U'{NlMaT&z^u+Sw]'a,B&+Y'dEn*^x_(d+Rf]k]d-L'qFn,[g-C&v,_'a-H&uS'dOp\M(dL*s']+lN,`Fc1B+wFpD*oO#s%EzEz.Ww_s]&u/Uu2V(dGd5T-a1_a3T/{.\y3[4f,Rf/H1c%Kc)K2r/Ir3P%m&Xm)[&u3Tu4I ` @
--- a/pltfiles/wizidd.plt
+++ b/pltfiles/wizidd.plt
@ -0,0 +1,8 @@
+`7l @ Tektronix 4010/PDP11 Graphic Editor
+
+*lw%D+pC,tE-xL.zX/z&F0xZ1t'R2k(L3`)Jp*H|+J4c,Me-Pc.T3{/Tp0V`1V2m2S1u3NiXeFjB2`2Ir1N3b0Qm/Ps.Qu-Pt,Om+Na*N2q)P1(Vi'\0oF/r&S.tE-t%Z,rT+pRaS%u'_a(V$n)R#*Pt+On,Qk-Rn.Ru/S$a0Rp1Q%c2Ly3E&rZ'o4L(m[)n5G*oL+rN,cMd[+q]*mZ)iT(gI'g4Y&iE%o3O$w2Ub1X#r0Xf/W".T}-R,O#f+Kq*J$a)Kv(M%k'T1h3SrJ2h2P{1U3k0Vw/T~.S4`-Q3~,Nw+Kk*K2{)Mh(P1q'V0u&_/wK.x%]-vR,sJ+pH*zI~O+pN,tO-uW.v&A/tP0r'C1mZ2c(Sw)O3g*Mr+My,Oz-Qx.Rr/Rf0S2x1Re2M1m3GfM,c5S+qT*nR)mL(k@'l4R&o3_%uI$~2Ok1T#}0Up/Ui.Se-Sg,Rn+Nz*O$g)Q}(T%r'\oX$z(Qd)N#u*Mi+Nc,Pa-Sd.Tj/Wv0W$g1Wz2P%r3L&l4C'iV(j5F)P*mW+qY,dX~%G.}"T/gLwL1~Y4m#RuXw$A5h&Nr)@oG3v*YqO5f(^4}&Pk$Dh#^1{D/t"Xj\-l%J/d#Sq"_1y#K3iY2z$K/d#S3c$Nr#\4`$BcJ3uXcNw%E4h$T5a(V4n)I3w%E0v&Y2m$X}[1`'BlK3m%HpV1s'R'g4Y%l6[d_${_v7DqDn@iAa6\#xZvSlQiGaFc5]"|[~SzQJ~Ez@|4W$w2Uh7Bf6\`\%d3E#~4P$kV%l3N&s4M%n5Uv6E'`4U"~5E#g4]m[p5@z@}G$fGiMsPtW~\~6C%eGcNgReQY${_%eYmWoQKj@$u5H#x4WkUdWe5AaKiAlDeMaKkNuCyFqPkNwT~J$dL#|WwT$d\lRpUh_d\m6Fu5\{6@qImFuO}G%aK$xSuOyZ%`QbV$z^yZ#rB{@$cGdN#O{FuJrBr2Vq_n3IiSdZ"}_s4DiF!GuFkDa3_ zZuSqIm2_lVmLqBu1XzR!aMkIuED"iEsI}M#dRiXn2BqLrV!cA"{A]z3AxFtJlKfJcF!B|FxJqLcLc2_p_s^x]zZLcLA"LrLZp^l_g^cZL#kVj_f3IbQ"{Xs\i4@!Au@k3\cX ~QzIv2_uVvLzB~1Z!cVkRuNM"iNsR{V#bZf2BjLkV$w8P&k3Qk*NtAo)T{NtHv(]~['p)G{G(d(^'|Tr_mXpPwM{H{']u]m(MgScOdF&}HvSrIr'_}W'd]k]iPdLiDrEyBy&LkJiS&w\vO'iCj%R`T&}K'uKp$[~_(l%StQnFu@~C)k$LcA(wOnPv#_nZa$J'{CuMr#[(eSr"]iVb]'y#OsM@{"ZIxFvPr![iXg"AkZf_`Wc!S`@&m Vl!Ew^v"NgGhRwV{#H'gIlSd$@&{#UtTy$FqJnBo#VhK%|K&c_n$Jt[h_d%DtKu[k[i&@qSnYt'KlNj&YeU`@%z%Xx&D~S&b'Xj]l(HhM%LzSX&oXp)BbHh*GkkMll,[oRwG'bKd[b-V&zWm,_l[l2NnDu1^~2A'cJc3C&}MuJl2N}U{^w\tUvO{O}V'g4Eg+^&~,_}-FyHvAv,Z{V~_(p2[l3M'y[oRm1^m.T~XQ(bNgQh[m\w[zUFqIOmT'{ItMoJl+\`D&}*R'bCi)^~\(d*AeGbJ'yMuIyG(`G'|CwAjDiIlO(k+GpYn,Fe-FaK'~U(aXdXgKkEnFpHQtQyN}N)l+Ls*_*gIm)GsRt*AwK}X+u+V,`\kWlLg*\+yBk)U,d]+UuJG,aK+z(Q|MM,k)Mg(IEkFpLs)KwPzHw(IyE|I-a^,)U-cXtN{M}Tx[f*Co+R.gRfN`L-}K.dJmL~SuHmGiDjAp@/aEiKz,AxK1k-Bx@q,Aq+YvV2{.@|ExMpT0g/T/~U|XuVsZt]x0@qAtJoIlJOiDbE.vYf1B-wDqEoLf2DLcO[/n3NlIgEi@nBoIzQ~G@0a2_e3E`NfXmXqXv4ArBm3]f]`4@GaLcO/~Q{M}KwBpCnAj@kCeFbAb3]e]lY-cE,zXv[qYs2^n3TjVgTPHn2Xg3CfR`T+~RK,dB+~IzGyB,`2W+z3@t2[iWkQ{S,d1\+rHbAc0^w1@,a0ZdVeR*rP(l/SnZ^h^dZbS'|J{N~Y(j0Zk1Sg2AdI'Q{3C~K(bMeMgIeCl2Zp[w/@uMmNg._v/B{-^l_pW|T^)x*XzMQ{K~D*eK)C)]*h*@d)YeUjWfTMkN)y*_*h+@oEtUs,EoKkKm+]gP)LxLrYs,@xKuKoFk+]sEx@*u*CjOrLq\vV{+G+`PgQbL*D*Y+`,[fS*}I+gKiAk@lIwMpSq]p]kV`[,bFnEn+Zu,EDxIRqOmZjTnKkIeHbF|+G|*X-eT,}QIyMkKqRkZs\|+G-qRfVhYoYv[a,GIqGbQ,W-fVjVe[,}_|-A-cF,vIgFYlY+zJT,v.MjL+xE,jXw_l/@zOfJu\-l0GcI,sD-cUvZhZi^r1D.p0[lZjVj/Jl.Zd-Hf@l,^t-@u,]t-H{,Bl+WfYd,AgRbW-}W]-B}E{B}K.bT`V-zVxV.a.G-zJ.aX-uY}/CFtGJxO}O~SwU.c]-x_{0G.dH-W.cZm]}LyOvLtEu/Xs.\tNrGyA~C/eQnYr]tZ}]wUQ~RwJ}FwDw-^zYuXT{PsPwEpEn,Zl-FnWg[b.IhiLoMqHmEhIiLkb0Dlf/NlJwMsOuVl^i0@g/\jZl^0e._mXgOoUvMsW]s]s/Ko._e_x/BG1s._rRlIdCaDFfLgZc/@0}BxB2a.Jd@1}-[2e\iVj[p\m.BoJiEbJf-N1w@pFs^v,R|MtK/zPuZqXpKlTfIaEA.{BHyMvOrKG-i1F,M-a^,zQpWtMkExE}0Y1H-jF,a/V+y\|0Du/^i_oYeRiNrRwKS,`V+y-[r.AMmEbJg@`-[iXnPrYy[*r.Pv[t/HoRfX)|YtSoJl.YmPtLsTv/E}J*dJm.ZnPrPm-I)N}WxPlTtLlCvF,[-H*mI,d1\u2H-cOkf*B,l}BxDkd)\'lg4FlFl,Ej+^g,@)l+Ll(Z*m)Gm&K-{)M{(A/z,Az']2{-_{+V0v4Av0U1v+Vv(D(p2[p0H)l(Al'O7j![j"WI5yIy#EE7jEj$H5yH6uHu#Eu%Ru$V7j%Yj$V5yVy%Y7j'X5y_6n(FM5yT7j[j)Wj*Ej)^5y^Wy*E7jZj+]5y*Zy+]y,R7j-@5yN6n,Yn-G5y\\7j\j.Xc_6|_uXu-\u.Q5y_y/MM7jMj0IcP6`P5yIy/M7j3Kj2VcO6`O5yVy3K6`R7cRjK5y4@@7j@j5C6u4\@7j7P^W5yWP^y8SS7jSj9OcV6`V5yOy8Sy:DD7jDj;@cG6`G5y@y:Dy;U7 @
+
+
+
+
+
--- a/pltfiles/wizwarp.plt
+++ b/pltfiles/wizwarp.plt
--- a/pltfiles/z_Einstein.plt
+++ b/pltfiles/z_Einstein.plt
--- a/pltfiles/z_aswan.plt
+++ b/pltfiles/z_aswan.plt
--- a/pltfiles/z_bostonufo.plt
+++ b/pltfiles/z_bostonufo.plt
--- a/pltfiles/z_fudge.plt
+++ b/pltfiles/z_fudge.plt
--- a/BIN
+++ b/BIN
--- a/tek4010.c
+++ b/tek4010.c
@ -246,6 +246,15 @@ int tek4010_on_timer_event()
        // or there is still a bright spot, return 1 to ask for
        // one more redraw
       
+        // is child process still running?
+        
+        int status;
+        if ((!noexit) && (isInput() == 0) && (waitpid(-1, &status, WNOHANG))) {
+                tek4010_quit();
+                gtk_main_quit();
+                printf("Process has been terminated\n");
+                exit(0);
+        }
        return (isBrightSpot || isInput());
 }
 
@ -306,6 +315,15 @@ void clearPersistent(cairo_t *cr, cairo_t *cr2)
        plotPointMode = 0;
 }

+void clearSecond(cairo_t *cr2)
+// clear second surface
+{
+        cairo_set_source_rgba(cr2, 0, 0, 0, 0);
+        cairo_set_operator(cr2, CAIRO_OPERATOR_SOURCE);
+        cairo_paint(cr2);
+        cairo_set_operator(cr2, CAIRO_OPERATOR_OVER);
+}
+

 void tek4010_draw(cairo_t *cr, cairo_t *cr2, int width, int height, int first)
 // draw onto the main window using cairo
@ -321,10 +339,7 @@ void tek4010_draw(cairo_t *cr, cairo_t *cr2, int width, int height, int first)
        showCursor = 1;
        isBrightSpot = 0;
        
-        cairo_set_source_rgba(cr2, 0, 0, 0, 0); // second surface is cleared each time
-        cairo_set_operator(cr2, CAIRO_OPERATOR_SOURCE);
-        cairo_paint(cr2);
-        cairo_set_operator(cr2, CAIRO_OPERATOR_OVER);
+        clearSecond(cr2);
        
        // clear persistent surface, if necessary
        if (globalClearPersistent) {
@ -345,14 +360,15 @@ void tek4010_draw(cairo_t *cr, cairo_t *cr2, int width, int height, int first)
        
        do {
                ch = getInputChar();
+                if (isInput() == 0) todo = 0;
                
                // fade away last bright spot vector
                if (vectorTable.intensity > 0.1) {
                        cairo_set_line_width (cr2, vectorTable.linewidth);
-                        cairo_set_source_rgb(cr2, 0.25, 0.7, 0.25);
+                        cairo_set_source_rgb(cr2, 0.45, 0.8, 0.45);
                        cairo_move_to(cr2, vectorTable.x0, WINDOW_HEIGHT - vectorTable.y0);
                        cairo_line_to(cr2, vectorTable.x2, WINDOW_HEIGHT - vectorTable.y2);
-                        cairo_stroke (cr2);
+                        cairo_stroke(cr2);
                        vectorTable.intensity = 0.0;
                        isBrightSpot = 1;
                }
@ -569,7 +585,13 @@ void tek4010_draw(cairo_t *cr, cairo_t *cr2, int width, int height, int first)
                                break;
                        default: switch (ch) {
                                case 0:     break;
-                                case EOF:   break;
+                                case 7:     // bell function, delay 0.1 sec
+                                            // cannot delay if bright spot is on, needs to be turned off first
+                                            clearSecond(cr2);
+                                            usleep(50000);
+                                            showCursor=0;
+                                            todo = 0;
+                                            break;
                                case 8:     // backspace
                                            x0 -= hDotsPerChar;
                                            if (x0<leftmargin) x0 = leftmargin;
@ -633,14 +655,4 @@ void tek4010_draw(cairo_t *cr, cairo_t *cr2, int width, int height, int first)
        // display cursor
        
        if (showCursor) doCursor(cr2);
-        
-        // is child process still running?
-        
-        int status;
-        if ((! noexit) && (waitpid(-1, &status, WNOHANG))) {    // Is child process terminated?
-                tek4010_quit();
-                gtk_main_quit();
-                printf("Child process has been terminated\n");
-                exit(0);
-        }
 }
--- a/tek4010.h
+++ b/tek4010.h
@ -1,6 +1,6 @@

 #define WINDOW_WIDTH    1024                // proposed width of main window
-#define WINDOW_HEIGHT    768                // proposed height of main window (as per Tektronix manual)
+#define WINDOW_HEIGHT    780                // proposed height of main window (as per Tektronix manual)
 #define WINDOW_NAME     "Tektronix 4010"    // name of main window
 #define ICON_NAME       ""                  // path to icon for window
				`@ -0,0 +1 @@`
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				`@ -0,0 +1 @@`
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