Video Repeater

Using, learning, programming and modding the Gigatron and anything related.
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brian
Posts: 7
Joined: 17 Dec 2019, 08:03

Re: Video Repeater

Post by brian »

Hi Walter,

Are kits still available?

We are in France.

Thanks

Brian
walter
Site Admin
Posts: 125
Joined: 13 May 2018, 08:00

Re: Video Repeater

Post by walter »

Still got 3. Will PM you.
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Ammer66
Posts: 9
Joined: 20 May 2018, 12:41

Re: Video Repeater

Post by Ammer66 »

Aloha Walter,

if possible, i would like one of the remaining kits too. Including an additional 74HCT377 (just to be safe).
Shipping to Germany, payment with PayPal.

Thx & Greets,
Karlheinz
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Ammer66
Posts: 9
Joined: 20 May 2018, 12:41

Re: Video Repeater

Post by Ammer66 »

I love the smell of new kits in the morning :P

complete Gigatron Video Reapeater kit
complete Gigatron Video Reapeater kit
20210709_160627.jpg (1.26 MiB) Viewed 398 times

Thank you Walter for making it easy for me by making and sending a complete kit 8-)
And of course thank you to Axelb and Hans61 for developing the thing :geek:
wbushby
Posts: 48
Joined: 16 Jul 2021, 10:59

Re: Video Repeater

Post by wbushby »

Hi @walter,

I would be interested in one of the video repeater kits. I am located in Portugal
walter
Site Admin
Posts: 125
Joined: 13 May 2018, 08:00

Re: Video Repeater

Post by walter »

They're sold out. Nice to see the surplus getting good new homes :)
Hans61
Posts: 29
Joined: 29 Dec 2020, 16:15
Location: Saxonia
Contact:

Re: Video Repeater

Post by Hans61 »

I'm still stuck on the idea of combining the "Video Repeater" and "RAM&IO Expansion" from lb3361 on one PCB. Unfortunately my day has too few hours. I would like to put a MCP23S17 on the board as well. Before I order a PCB I would like to have it tested.
I found these two videos that show it can be done. I have tried to reach the author, but so far no response.
https://www.youtube.com/watch?v=3ugpzAZGCHQ
https://www.youtube.com/watch?v=4vkLmdJQkBA
In the first one the author shows a test in WozMon and ROM v3x. Unfortunately I can't reproduce it. That on 0x50 could still be data. But when I run the program on 0xA0, which the author enters and executes, through the 6502 disassembler I get this:
* = $00A0
00A0 75 59 ADC $59,X
00A2 00 BRK
00A3 2B ???
00A4 79 CF 76 ADC $76CF,Y
00A7 59 14 5E EOR $5E14,Y
00AA 79 1A 0E ADC $0E1A,Y
00AD 5E 7A CF LSR $CF7A,X
00B0 76 1A ROR $1A,X
00B2 0F ???
00B3 8C FF 35 STY $35FF
00B6 3F ???
00B7 A5 63 LDA $63
00B9 FF ???
.END
Unfortunately this makes no sense to me.
Is there a software/example to test the MCP23S17 on the Gigatron? I'm stuck there right now. If the MCP23S17 works on the Gigatron I would make a PCB.
bmwtcu
Posts: 57
Joined: 01 Nov 2018, 12:02

Re: Video Repeater

Post by bmwtcu »

Hans, that was Marcel's youtube channel, which explains why you haven't heard back. Not sure what you're specifically looking for but he went over it in some detail in the RAM Expander log https://hackaday.io/project/164176-giga ... m-expander . I'd imagine Leon would be familiar with the code as well and can advise where a working version resides on the github.
lb3361
Posts: 77
Joined: 17 Feb 2021, 23:07

Re: Video Repeater

Post by lb3361 »

I believe there are two WozMons. The first one (roms v3 and v4) was a vCPU translation of the original 6502 code. There is no point trying to find 6502 opcodes as these roms didn't have the v6502. The second one is the original one that runs in the apple1 emulation using v6502 in rom v5a.

As for using the MCP chip with the SPI extension, I have no experience with it but as long as it uses spi mode 0, things should work.
Last edited by lb3361 on 29 Aug 2021, 09:38, edited 1 time in total.
Hans61
Posts: 29
Joined: 29 Dec 2020, 16:15
Location: Saxonia
Contact:

Re: Video Repeater

Post by Hans61 »

Oh I didn't know it was Marcel's youtube channel. First of all thanks for the information. Then I'll have to look into what SPI support the ROM offers and how to use it.
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