PCjr Accelerator

Hardware questions and modifications

PCjr Accelerator

Postby Tempest » Wed Mar 10, 2021 6:08 am

Did anyone see this? He's claiming that the PCjr can reach AT speeds with his plug in accelerator and a command line program. Seems too good to be true.

https://your.cheer.id/ibm-pcjr-fpga-acc ... r-mcl86jr/
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Re: PCjr Accelerator

Postby Brutman » Wed Mar 10, 2021 7:19 pm

Old news ;-)

You can find the original discussion of it right here on this forum: viewtopic.php?f=1&t=603&p=4489

(Ted is an engineer at one of the bigger Tech firms.)
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Re: PCjr Accelerator

Postby Tempest » Thu Mar 11, 2021 6:04 am

I see that now. Did anything every become of this? The last post is from 2017.
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Re: PCjr Accelerator

Postby DoctorOctal » Thu Mar 11, 2021 7:17 am

The link you posted above is to an illegitimate, mangled copy of Ted’s original blog entry that describes what he’s done:

<https://microcorelabs.wordpress.com/2020/11/12/ibm-pcjr-accelerator-mcl86jr/>

You can backtrack to earlier entries for more of the story.

He ended up designing a plug-in board with RAM as discussed in the thread on this forum. He made a few copies, and I have one.

I’ve done some preliminary testing, and it mostly seems to work well. Benchmarks show AT-like speed and applications run noticeably faster. I’ve run into some compatibility issues, however, that aren’t just because of the speed difference. For example, even in cycle-accurate mode, some benchmarks lock up the machine, and the built-in diagnostics are very weirdly screwed up. I think there may be some bugs to work out but haven’t yet had a chance to finish my testing and follow up with Ted.
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Re: PCjr Accelerator

Postby Tempest » Fri Mar 12, 2021 6:42 am

Ok, thanks for the info. I await the day my PCjr can run some of those later games that support Tandy graphics at a normal speed.
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Re: PCjr Accelerator

Postby GHiero » Fri Mar 12, 2021 5:12 pm

Tempest wrote:Ok, thanks for the info. I await the day my PCjr can run some of those later games that support Tandy graphics at a normal speed.


With a PC Sprint Mod your PCjr. can run games faster than many Tandys.
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Re: PCjr Accelerator

Postby Tempest » Sat Mar 13, 2021 7:05 am

GHiero wrote:
Tempest wrote:Ok, thanks for the info. I await the day my PCjr can run some of those later games that support Tandy graphics at a normal speed.


With a PC Sprint Mod your PCjr. can run games faster than many Tandys.


Too fast isn't a good thing for compatibility. Got a link to this mod? PC Sprint Mod is a bit too generic for Google to figure out.
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Re: PCjr Accelerator

Postby GHiero » Sun Mar 14, 2021 9:32 pm

Tempest wrote:
GHiero wrote:
Tempest wrote:Ok, thanks for the info. I await the day my PCjr can run some of those later games that support Tandy graphics at a normal speed.


With a PC Sprint Mod your PCjr. can run games faster than many Tandys.


Too fast isn't a good thing for compatibility. Got a link to this mod? PC Sprint Mod is a bit too generic for Google to figure out.


You cast your line too far, your fish are much closer to shore : viewtopic.php?f=1&t=763
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Re: PCjr Accelerator

Postby Tempest » Mon Mar 15, 2021 7:59 am

GHiero wrote:You cast your line too far, your fish are much closer to shore : viewtopic.php?f=1&t=763


Ah, thank you. Are these boards still being made?
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Re: PCjr Accelerator

Postby RiverBoa99 » Tue Mar 16, 2021 10:16 pm

He may make some more in the future. I'll let you know what I hear from him.
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