Free 68000 ICs to Good Home.

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Dave
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Re: Free 68000 ICs to Good Home.

Postby Dave » Thu Feb 28, 2019 11:08 pm

lezanderson wrote:68008 CPU (HD/MC68008P12) 12Mhz Max.


The 68SEC000 is the same price and MUCH faster and cooler. Also, two more address lines than the PLCC version and four more than the DIP-48.
I wish Sinclair used the DIP-52 version of the 68008 back then, before the PLCC one was available.

lezanderson wrote:512K SRAM or more
64K,128K EPROM


Flash needs to replace EPROMs and it needs to be in system programmable.

lezanderson wrote:CPLD to emulate ZX8301,ZX8302


Oh, make it easy why don't you? :P If you can do VHDL I can get you the documentation you need - mostly, it's all here and provided with explanations by the very talented Mr. Nasta.

lezanderson wrote:Modern MCU to do functions of 8049 including Handling Microdrives


Microdrives are handled by the 8302. The 8049 does keyboard scanning, sound generation and the receive side of serial.

lezanderson wrote:Extra I/O via ICs like MC68901,68230,68681 etc


And someone to rewrite the OS to support them.

lezanderson wrote:WDC1773 Floppy disc functionality… thou this may be rather obsolete ?


The DP8473 is better supported by drivers, and I have 100 here ;)

lezanderson wrote:SD Card via PIO connectivity.


QL-SD seems to fit the bill.

lezanderson wrote:Real time Clock & Calendar for Time Date: DS12887/DS1310 etc


There's so many RTC choices it's sickening....

lezanderson wrote:Voltage Regulator to supply +12V, +5V to Board.


If you replace the MC1488/1489 with a single voltage serial transceiver, you don't even need +/= 12V.


Yes, we've all had these thoughts 1000 times.


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Whopper
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Re: Free 68000 ICs to Good Home.

Postby Whopper » Fri Mar 01, 2019 1:22 pm

Dave wrote:If you can do all that stuff you said, I'll do the PCB.


Err... I said I could DO stuff!!!


You woke me for THAT!!!
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Dave
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Re: Free 68000 ICs to Good Home.

Postby Dave » Fri Mar 01, 2019 4:20 pm

Whopper wrote:Err... I said I could DO stuff!!!


Then do it! :P


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Whopper
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Re: Free 68000 ICs to Good Home.

Postby Whopper » Fri Mar 01, 2019 4:23 pm

Dave wrote:
Whopper wrote:Err... I said I could DO stuff!!!


Then do it! :P



But . . . but . . . I'm SURE I never said I could do stuff. :oops:


You woke me for THAT!!!
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Re: Free 68000 ICs to Good Home.

Postby Nasta » Mon Mar 04, 2019 8:58 pm

Dave wrote:
lezanderson wrote:68008 CPU (HD/MC68008P12) 12Mhz Max.

The 68SEC000 is the same price and MUCH faster and cooler. Also, two more address lines than the PLCC version and four more than the DIP-48.
I wish Sinclair used the DIP-52 version of the 68008 back then, before the PLCC one was available.


As far as I know, there never was a 52-pin DIP version of the 68008, because the 52-pin DIP package was not standardized or commonly used back then. MAYBE only as a shrink-DIP version with a smaller pin pitch but that was very much a Japan only thing back then.
The 52-pin PLCC was available when the QL started shipping but by then it was probably too late, as can be seen by a rather large number of QLs using a much more expensive ceramic 48-pin DIP package for the 68008.


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Dave
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Re: Free 68000 ICs to Good Home.

Postby Dave » Mon Mar 04, 2019 11:38 pm

Nasta wrote:As far as I know, there never was a 52-pin DIP version of the 68008, because the 52-pin DIP package was not standardized or commonly used back then. MAYBE only as a shrink-DIP version with a smaller pin pitch but that was very much a Japan only thing back then.
The 52-pin PLCC was available when the QL started shipping but by then it was probably too late, as can be seen by a rather large number of QLs using a much more expensive ceramic 48-pin DIP package for the 68008.


It was a Sharp-labeled part, used in one model of their X68000. I am not sure but I think they used a 68000 as the main CPU, and the 68008 was part of a graphics subsystem. I saw a pic and it was in the purple/gold ceramic case. I might be misremembering - it was 30+ years ago.

Sharp also has a wonderful custom of giving their chips names, like Cynthia and Hysteria.


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Peter
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Re: Free 68000 ICs to Good Home.

Postby Peter » Tue Mar 05, 2019 8:12 am

Dave wrote:
lezanderson wrote:Real time Clock & Calendar for Time Date: DS12887/DS1310 etc


There's so many RTC choices it's sickening....

For a chance of software support, it could make sense to use the Q68's DS1374 which includes a reset generator.


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Re: Free 68000 ICs to Good Home.

Postby vanpeebles » Tue Mar 05, 2019 8:21 am

Dave wrote:
Nasta wrote:As far as I know, there never was a 52-pin DIP version of the 68008, because the 52-pin DIP package was not standardized or commonly used back then. MAYBE only as a shrink-DIP version with a smaller pin pitch but that was very much a Japan only thing back then.
The 52-pin PLCC was available when the QL started shipping but by then it was probably too late, as can be seen by a rather large number of QLs using a much more expensive ceramic 48-pin DIP package for the 68008.


It was a Sharp-labeled part, used in one model of their X68000. I am not sure but I think they used a 68000 as the main CPU, and the 68008 was part of a graphics subsystem. I saw a pic and it was in the purple/gold ceramic case. I might be misremembering - it was 30+ years ago.

Sharp also has a wonderful custom of giving their chips names, like Cynthia and Hysteria.


I'll have to check my pair, I can't remember seeing one, but I was more concerned at looking for leaky caps :D


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Dave
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Re: Free 68000 ICs to Good Home.

Postby Dave » Tue Mar 05, 2019 2:45 pm

It was an incredible machine for the time. It relied heavily on custom chips, and Sharp had the kind of relationship with Motorola where they could request features and Motorola would do it.

Back then, the big three were Sony, Hitachi and Sharp.



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