WonderVIC

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MCes
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WonderVIC

Postby MCes » Wed Mar 01, 2017 9:37 am

WonderVIC is ready!

This is a modified VIC20 PAL board,
the modification is a FULL expansion RAM (37K) and an alternative kernal,
all is "on board" leaving the cartridge expansion free for user ,
the RAM/Kernel setting are chosen (during HW reset) through the function keys: no hole on case!
HW reset can be generated by continuos pressing of "RESTORE" key.


Code: Select all

 continuous pressing of RESTORE will generate a HW RESET,
 during HW RESET the function keys could select:
  _____________________________________________________
 |          | 3k RAM |  16k   |  8k  |   2K   |   8k   |
 | F5 F3 F1 | 1+2+3  | BLK1+2 | BLK3 | I/O2+3 |  BLK5  |
 |__________|________|________|______|________|________|
 | -- -- -- |   --   |   --   |  --  |   --   |   --   |
 | -- -- ** |   **   |   **   |  --  |   --   |   --   |
 | -- ** -- |   **   |   --   |  --  |   --   |   --   |
 | -- ** ** |   **   |   **   |  **  |   --   |   --   |
 | ** -- -- |   **   |   **   |  **  |   --   |   **   |
 | ** -- ** |   **   |   **   |  **  |   --   | R.ONLY |
 | ** ** -- |   **   |   **   |  **  |   **   |   **   |
 | ** ** ** |   **   |   **   |  **  |   **   | R.ONLY |
 |__________|________|________|______|________|________|

      (R.ONLY = Read only: ROM emulation)
     
 F7= second kernal (example: JDos + cartridge autostart disabled)


Price is 64€+shipment.

Note:
This motherboard is on sale without plastic case and keyboard to reduce the price of object and the shipment,
but if somebody is interested I can sell its keyboard and plastic case

Image
Image
Doom with empty cartridge slot!!!
Last edited by MCes on Sat Sep 02, 2017 11:05 am, edited 4 times in total.
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Vic20-Ian
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Re: WonderVIC

Postby Vic20-Ian » Tue Mar 14, 2017 3:38 pm

Interesting. Can you describe a bit about what you did here?
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MCes
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Re: WonderVIC

Postby MCes » Wed Mar 15, 2017 11:41 am

Vic20-Ian wrote:Interesting. Can you describe a bit about what you did here?


This HW solution could be sectioned in three parts:
1) the part that feel the continue pressing of key "RESTORE" and consequently perform an HW RESET
2) the part that on "HW reset" check the keyboard with a "micro scan" and memorize the status of "function keys" on a proper "internal register."
3) the part that dinamically compare the bus configuration with the "internal register" and decide which memory (RAM8K/RAM32K/epROM32K) has to be selected and the proper block-address

The epROM with 3 images (BASIC / originalKERNAL / alternative patched KERNAL) is on BASIC-ROM socket, the 2 RAM chip (8k+32k) are soldered toghether and placed on KERNAL-ROM socket.

It wasn't simple organize & put all system management inside a simple chip!
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MCes
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Re: WonderVIC

Postby MCes » Sun Mar 19, 2017 11:38 am

Note:
This motherboard is on sale without plastic case and keyboard to reduce the price of object and the shipment,
but if somebody is interested I can sell its keyboard and plastic case
“Don’t argue with idiots because they will drag you down to their level and then beat you with experience” (Mark Twain ?)

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MCes
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Re: WonderVIC

Postby MCes » Mon May 29, 2017 1:49 am

New price!
“Don’t argue with idiots because they will drag you down to their level and then beat you with experience” (Mark Twain ?)

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R'zo
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Re: WonderVIC

Postby R'zo » Wed May 31, 2017 1:19 pm

What is the purpose of the alternate kernel in this mod?
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MCes
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Re: WonderVIC

Postby MCes » Thu Jun 01, 2017 12:18 am

R'zo wrote:What is the purpose of the alternate kernel in this mod?


in my prototype the "alternative kernal" is a modified jiffydos,
the modify skip the cartridge auto start:
it's useful for copying cartridges or if you had a cartridge image on ram but you want not start it (for a new software session....)
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javierglez
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Re: WonderVIC

Postby javierglez » Sat Jun 03, 2017 3:40 pm

Is the VIC chip socketed so that it can fit the s-video mod without soldering ?

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MCes
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Re: WonderVIC

Postby MCes » Mon Jun 05, 2017 8:29 am

unfortunately 6561 is soldered
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Re: WonderVIC

Postby MCes » Sat Sep 02, 2017 11:06 am

price drop!
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COREi64
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Re: WonderVIC

Postby COREi64 » Sat Sep 16, 2017 6:45 pm

Have you ever thought of building/selling a WonderVIC PCB that people could install in their own VIC?

COREi64

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MCes
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Re: WonderVIC

Postby MCes » Wed Oct 04, 2017 12:56 am

SOLD!
This HW mod is a lot of job and now I won't make soon another "wondervic".


COREi64 wrote:Have you ever thought of building/selling a WonderVIC PCB that people could install in their own VIC?

COREi64


May be that I will make a PCB for a better ingegnerization, but "wondervic" had a too small success, not sufficient to justify PCB projeting and realization....

I had also developed a SW patch for the kernals that read the function keys during startup ( this for minimize the HW wiring job),
but some wires have to be soldered from PCB to motherboards, and not all are able (or want) to do this into own VIC20...

I could try a "preorder", with people that make reservation for a modifying kit.... if reach 5 pcs I could start the PCB project.....

What do you think about?
“Don’t argue with idiots because they will drag you down to their level and then beat you with experience” (Mark Twain ?)

COREi64
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Re: WonderVIC

Postby COREi64 » Fri Oct 20, 2017 2:18 pm

What do you think you the kit would cost? I am certainly interested in hearing more! I can speak for my VIC-20 in that it would love to have one installed! :D

I certainly understand you wanting to make sure you get enough people interest. Having a board that pops in, and perhaps wires that are attached with IC clips could possibly make the installation more attractive to those adverse to soldering...

Thomas


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