Help with Kaiser's Highway Star repro

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tiretrak
Posts: 13
Joined: Sun Sep 27, 2020 11:29 am

Re: Help with Kaiser's Highway Star repro

Post by tiretrak » Wed Oct 21, 2020 9:22 am

krzysiobal wrote:
Sat Oct 17, 2020 2:33 pm
tiretrak wrote:
Sat Oct 17, 2020 1:10 pm
krzysiobal wrote:
Sun Oct 11, 2020 1:22 am
Do you have back-side photo of this PCB?
which pcb ?
Image
sorry.i dont have this. foto from internet

krzysiobal
Posts: 815
Joined: Sun Jun 12, 2011 12:06 pm
Location: Poland

Re: Help with Kaiser's Highway Star repro

Post by krzysiobal » Fri Oct 23, 2020 9:33 am

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

I attach the dump. 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
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)
comparision.jpg

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tiretrak
Posts: 13
Joined: Sun Sep 27, 2020 11:29 am

Re: Help with Kaiser's Highway Star repro

Post by tiretrak » Sat Oct 31, 2020 10:45 am

krzysiobal wrote:
Fri Oct 23, 2020 9:33 am
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

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