chart45

i bought that game ,very nice and you made the coleco talk.... thanks and hope more game will be aviable the way you did.... i think people will buy more game and im the kind of guys to buy the cart and the rom to play with my atarimax sd thanks and tout mes condoleaces

ok now i receive everything i need i think 74ls74 to divide clock 74ls 138 to decode address for sound,24k and lower 8 k 64k chip 32k chip ay-3-8910 now with my new baby girl i dont have a lot of time to learn all this decodind technic but i will try my best to be able to play all those sgm game

receive my game today really happy and i took a picture of rollerball im sad that i had miss the collectorvision controller any chance of another run of those arcade controller

for sure if you alredy have a sgm you dont have to try to build something to play those game hope that one day my turn will come... i pay for one but eduardo didnt comfirm or reply but since he is mia but people still receive sgm i have some hope

lucky you can now play king valley and thexder with sound.... the only thing i dont understand is that you and 5-11 could mod a coleco to play those games why you did'nt ??

nanochess i was writing the msg when you post ill try thanks

that's my problem i cant figure the output since i dont understand what go in i know when z80 output rd or wr iorq go low . i read a lot of stuff on the z80 and 74ls138 but nowhere i found info on what the address output i know i have a big lack of knowledge about that level of electronic but i try very hard cause i really want to play those sgm game ... could you tell me if i have to use the 74ls00 with the output of the 74 ls138 like the circuit i found on google and i will try every possibility thanks for your time 5-11

5-11 ,nanochess help

now i output audio and clk if someone could comfirm im still on track please still trying to figure the decoding part but i dont understand im missing to much of theory

clk of the ay chip direct to the clk of the expension port nothing in between resistor ???? have you seen a good copy of that circuit from opcode for the audio out it look like the 3 chanel goes to audio out(pin 56) of the expension port with resistor and I think a capacitor

ok now im at that point i put bc2 to 5v since is always high to read or write. i draw the address decoder like you said 5-11 but i cant figure it out. i think i have to use the y0 y4 and y7 with a 74ls00 to output the bdir and bc1 but since i cant understand the decoding i cant draw the bc1 and bdir. do you know a site or a pdf that could help me to understand the decoding part...

a0<and>a1 mean with resitor and diodes to c

ok now I try to understand address decoding so don't laugh at me "si chu dans le champs" ok so port 50h a0=0 and a1=0 51h a0=0 and a1=1 52h a0=1 and a1=0 53h a0=1 and a1=1 the ay-3-8910 to be read need bdir=0 bc2=1 bc1=1 write bdir=1 bc2=1 bc1=0 the decoding is made by the 74ls138 chip ok on the z80 when its time to read iorq=1 and rd=1 than iorq=0 rd=0 write iorq=1 and wr=1 than iorq=0 wr=0 but I don't understand how to decode a0 and a1 or why a4 - a7 /iorq since iorq is always 0 if rd or wr is not selected is that a4 a7 are duplicate ??? the way to hook the chip will be very appreciate but i'm here to learn and understand so please give me the explanation is where im at

yes the cart offer

i reserve a copy of load runner in the collectorvision offer is that version i will receive i hope so

ok i foud this circuit to show the clock with a 74ls74 but if i dont have to use this only to plug on the expension port that will be easier but i was thiking that the clock was to high for the ay chip

i found this circuit on google its just a starting point.... i read that the sgm look for 50h to 53h for me that mean nothing but for you probably ill try to find info in the z80 programation nano did the software to detect the sgm so i think he could help us with that part.

5-11, nanochess could you look a this to see if im going some where or im not on track at all thanks guys

found that maybe it's close

i already ordered the ay-3-8910 and i try to understand how to hook it up to the coleco

my coleco now have 24k ram thank to you guys now i will receive my thexder cart soon and i want to play do i really need to hook the ay-3-8910 sound chip what the cart look to start i look the technical spec of the sgm i dont understand everything since im not familliar whit ic and programation but if im right it look to port 50h 51h 52 and 53h it's a0 and a1 can i use a sn74ls138 and use the a0 and a1 to output a cs to a8 and a9 of the ay chip???? im probably wrong that's why i.m here to learn and i dont mind if i have to order ic and programer and if the sound its not 100% i dont care my goal is to be able to play .. i dont want to creat another sgm since that thing is perfect but i want to play until eduardo get back on track. im sure im not the only one so other people will probably do the same if it's working goal be able to play

ill take rollerball a.e loadrunner

the signal to switch the bios come from where the cartrige port ??? and do i really need a separate cpu to doing it ??

so by using the master 6801 of the adam i will be able to doing it with your help : )

the sgm have is own cpu an bios ??? if yes is it possible to replace one of the adam to the opcode 32k bios