Help with Kaiser's Highway Star repro

[tiretrak]

Do you have back-side photo of this PCB?

which pcb ?

sorry.i dont have this. foto from internet

[krzysiobal]

I've just bought the Highway Star LH42 with hope that it is the same blob version as yours.

I attach the dump.

Highway Star Highway Star 7402+138+174+373+74 [apply over Highway Star (J)].ips

(244 Bytes) Downloaded 27 times

One important thing that I ignored: if you look at the schematic, there is the part with 7474 that I considered wrongly weird, because it does nothing (I thought its Q is used, not /Q). It actually inverts the PRG-A16 line, so before burning your EPROM, either:
* swap the lower and upper 64kB of your 128kB ROM
or
* tie the PRG-A16 to 7474's pin 12, not pin 8.

inv.png (8.83 KiB) Viewed 2376 times

BTW. Mine PCB slightly differs from yours by placement of few vias. The reason is that your PRG blob has a DIP28-mask rom pinout (pin22=PRG A16), while mine has a DIP32 jedec pinout (pin3=PRG A16)

[tiretrak]

I've just bought the Highway Star LH42 with hope that it is the same blob version as yours.

I attach the dump.
Highway Star Highway Star 7402+138+174+373+74 [apply over Highway Star (J)].ips

is it correct file ? i see no data inside
https://prnt.sc/vb2twq