Posted By
C16Terminal
on 2019-10-30
06:17:42
|  Re: C16 Expansion Port to User Port
So I made a few steps - but there are also problems.
1.) Via a friend it could also be that I get a printable layout for the pcb - let's see.
2.) Meanwhile I made the Userport with a breadboard and the chips:
IC UM 6522 A
74 LS 04 N
74 HC 133 B1
according to the manual in the compute magazine (here page 51 and here page 53)
BUT I do have problems to test it:
a) I need the Poke's to open the channel to the WiModem.
In the manual is written:
"For this purpose, the corresponding register number is added to the basic address" - an example is given to sett all port B lines as output:
10 Poke 64770;255
b) What for Poke do I have to program to open the line to the WiModem (this was made for the C64 Userport and the one that I built is identical with that)???
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