evietron
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Posts posted by evietron
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There are a few pots inside the machine. Get yourself a ceramic tuning tool. On mine there were still some display issues after adjusting them, so I ran a PCB for a composite mod.
As for the voltage it goes through a rectifier and then a 5V regulator, so higher voltage just means more heat generated in the machine.
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On 10/25/2010 at 6:20 AM, GroovyBee said:
The "half width" looks like the video mode has changed from 160A to 160B. Does this happen in the emulator? I don't play Choplifter much on my 7800. Writing junk to the Display List will cause a variety of problems including "half width" and the bars above.
I can confirm this is caused by the display list RAM being corrupted due to contention with the joystick/6532 input. It's most likely a hardware bug with earlier revisions of the MARIA chip.
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OK save games have been implemented in latest BackBit firmware. It passes the JLP test program. It will not save permanently until you press the cart button to return to the menu. Let me know if you run into any issues.
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I made a tentative implementation of JLP flash. The way I set it up it will use the BackBit versioning system to store saves, and they will be appended to the ECS file internally, with the option to export them as well to standalone files. And it should work for any JLP flash saving cart. After I get it working I'll send you a build to test.
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Tell me what mappers are still glitchy, and I can check if there are improvements that can be made.
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There were some bugs that were fixed. I can still add saving support.
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On 4/15/2023 at 6:26 PM, rensoup said:
Given what @Solitaire01 said regarding the game crashing at the exact same spot on both fujinet and your cart, I'm guessing that's not it but in any case here's the code I use for bank switching (I'm guessing you already know)
.IF .DEF ATARIMAX_128KB BANK_OFF = $80 BANK_ON = $00 ROMBankSize = $2000 ROMBankSwitch = $d500 ROMBankSwitchOff= $d510 .ENDIF .IF .DEF ATARIMAX_1MB BANK_OFF = $80 BANK_ON = $00 ROMBankSize = $2000 ROMBankSwitch = $d500 ROMBankSwitchOff= $d580 .ENDIF .IF .DEF MEGACART BANK_OFF = $80 BANK_ON = $00 ROMBankSize = $4000 ROMBankSwitch = $d500 ROMBankSwitchOff= $d580 .ENDIF .IF .DEF SIC BANK_OFF = $40 BANK_ON = $20 ROMBankSize = $4000 ROMBankSwitch = $d500 ROMBankSwitchOff= $d500 .ENDIF CurrentROMBank .byte 0 ; IN: X = BANK SwitchROMBank pha txa stx CurrentROMBank ora #BANK_ON sta ROMBankSwitch,x pla rts DisableROMBank pha lda #BANK_OFF sta CurrentROMBank sta ROMBankSwitchOff pla rts
OK, I'll revert AMax to use the bank mask for disable -- other than that everything should work fine on BackBit. Good to hear you guys caught the bad RAM issue.
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Most AtariMax releases work fine, including that sampled sound demo. I think the issue might be bus noise triggering bank changes in certain cases. I'll look into it.
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I support MAX & MEGA banking schemes. Just updated AtariMax scheme to use 0x80 for disable. Not sure what else the issue would be, and I can't test as I only have a 64K XEGS.
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On 3/20/2023 at 7:13 AM, e5frog said:
Hope I didn't scare @evietron away, I see I forgot to @ her in my reply.
Hope the BackBit's availability an my temporary wealth coincide at a later date.
Thanks, I prioritize requests based on who posts at the BackBit Forum. Post the ROMs you want supported there, and I'll do my best. Just received a big batch of chips, so orders are only dependent on build time now (although there is a 1-2 month backlog currently).
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3 hours ago, Gemintronic said:
Comparing the Concerto to Backbit is like comparing a swiss army knife to a steak knife.
When you want to eat steak a steak knife just works. You get a swiss army knife because it does other things too.
So, I'll keep my steak knife. Save up for a swiss army knife. Collect adapter ends like pokemon.
Yep, BackBit is definitely not a steak knife. I don't particularly care for steak actually, though I do enjoy a good hamburger.
As for the 7800, I've made a number of fixes just in the past few days:
- Faster startup & some stability fixes
- Can now be operated without the reset wire
- Improved POKEY accuracy, sounding great on Popeye for instance
Next I'll be working on supporting additional banking schemes for some of the modern homebrews.
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It runs all titles I could find. Exposed memory is from 0x0800 to 0xffff (i.e. 62K). The format is BIN, although it would be possible to add support for another format if I can see a spec. Any ROM memory that is unused can be used as RAM.
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I prioritize feature requests based on what users request on the BackBit Forum. The higher price point of the 7800 adapter compared to other BackBit adapters is because it has its own CPU. The adapter's firmware is upgraded automatically by the BackBit cart itself.
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My guarantee is that if your game does not work on BackBit, I will work to make sure it does.
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On 1/29/2023 at 5:20 PM, cmadruga said:
Unfortunately the testing process involves many iterations, and I think having to send games to each hardware developer is not practical.
If the issue is a cartridge issue and not a software issue, then once the issue is fixed in the firmware, it will work for all games. Having non-working games sent to me is the only way to improve support. I support 29 systems, and I don't have time to test every game on every system. But having a specific game that works in an emulator but not on the hardware is something I can easily look into. Caleb has been very helpful in identifying ROMs that don't work (yet), and I've fixed a lot of issues thanks to him bringing them up. If people just bitch and complain that something doesn't work and don't communicate with me like a human being then we all suffer. I added Intellivision support to BackBit based on dozens of requests I got from people, and I've spent a lot of time debugging various issues that have come up. I work diligently to fix anything that is broken in the firmware, and by the way I also build all the hardware myself.
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Do you have a Fairchild Channel F that works but doesn't play cartridges? These brand new cables will fix your cartridge bay.
https://www.ebay.com/itm/134422695625
Feel free to ask me any questions about repairs or symptoms you may have with your Channel F.
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The 2600 is one of those systems that can't be halted to communicate with BackBit, so the menu interface won't work without the reset pin. On my 2600 Jr, it crashes and restarts itself, so you can sometimes go without it, but I guess the implementation on the Flashback is different. Without the wire, you'll need to press reset after the startup screen, each time you change menu pages, and after you select a title. If that doesn't work, maybe there is a pin somewhere else that can trigger a cold reset.
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Is there any information on this HYB / DAT format? I'm happy to support it if I can find the spec.
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It's a SD multi-cart that works on multiple systems through adapters.
https://backbit.io/downloads/Docs/BackBit Cartridge Documentation.pdf
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I thought this screen effect looked pretty cool. Turns out it's a faulty CD4081 AND gate on the blue color line.
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Very similar, but my own design. I have a new revision which fixes timing issues that happen on some machines.
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BackBit now supports Vectrex. Cartridges are still on backorder, but a queue is forming.
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You can autostart a game on one platform, but if you change devices it will reset it.
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Multi-cartridge for INTERTON VC4000 VIDEO COMPUTER
in Classic Console Discussion
Posted
If anybody's interested, BackBit now supports full RAM expansion for Interton and Acetronic/Radofin machines.