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Nachbau der Programmierbaren Parallelschnittstelle mit 8255 Chip.

Orig. Schaltplan siehe Doku zum MFA System.

TESTED now! Works, but some flaws in the pcb:

A0-A3 at 74LS85 are in reversed order.

View from parts placement - VG64 is on the left side:

A A A A
7 6 5 4

R R R R
4 3 2 1

10x Pinheader on left outer position has the following connections from top to bottom when VG64 is to the right side (It should be PC7-NC-PA7..PA0-NC-PC6):

N.C
PC6 - (ACK)
PA0
PA1
PA2
PA3
PA4
PA5
PA6
PA7
PC7 - (Strobe)
N.C

sp1

Debug session closeups:

dbg1

dbg2

Ready with Talkie/Speech attached:

rdy