https://www.ebay.co.uk/itm/223046561834
Never seen one with markings shown (Plessey) and dated 1990 week 29.
Don't think the Commodore 64 or Atari used them though
Microdrive ULA2G007E5
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Re: Microdrive ULA2G007E5
Hi!
Thanks for flagging-up this sale. I picked-up a couple to replace dead MDV ULA's in some of my ageing units - just to see whether they were legit...
They arrived promptly this morning and tested OK - I have a bare MDV unit with the original ULA replaced with a DIP socket (I know - not best practice, but seems to work), which allows me to easily swap-out ULAs.
I can't comment on the accuracy of the date-stamping (mine are also marked 'Plessey' - Batch code '9029'), but as they work, I've ordered another few for posterity - seems like they have plenty more in stock.
I wonder if these were produced aftermarket for the OPD and/or Merlin Tonto?
Thanks for flagging-up this sale. I picked-up a couple to replace dead MDV ULA's in some of my ageing units - just to see whether they were legit...
They arrived promptly this morning and tested OK - I have a bare MDV unit with the original ULA replaced with a DIP socket (I know - not best practice, but seems to work), which allows me to easily swap-out ULAs.
I can't comment on the accuracy of the date-stamping (mine are also marked 'Plessey' - Batch code '9029'), but as they work, I've ordered another few for posterity - seems like they have plenty more in stock.
I wonder if these were produced aftermarket for the OPD and/or Merlin Tonto?
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Re: Microdrive ULA2G007E5
Good to hear they are legit, happened upon them when looking for Z8S18020 CPUs (20Mhz Z80 *).
Have bought a few items from same seller, well priced too, some stuff very cheap (HY29F400BT Flash). Has some other interesting 68000 stuff (68060/68030/68302/68340**).
*Update: BTW beware Z80 DIP40 20MHz PEC chips - feedback cites failure at 5 to 6MHz and suspects 4MHz parts.
**Update2: correction to misspell, was 68430, doh!.
Have bought a few items from same seller, well priced too, some stuff very cheap (HY29F400BT Flash). Has some other interesting 68000 stuff (68060/68030/68302/68340**).
*Update: BTW beware Z80 DIP40 20MHz PEC chips - feedback cites failure at 5 to 6MHz and suspects 4MHz parts.
**Update2: correction to misspell, was 68430, doh!.
Last edited by ones' complement on Sun Apr 17, 2022 12:50 am, edited 3 times in total.
Re: Microdrive ULA2G007E5
I found some 33MHz Z8S18033 - they passed all the test that I can throw at them - and being CMOS - you can run these at 20Mhz tooones' complement wrote:Good to hear they are legit, happened upon them when looking for Z8S18020 CPUs (20Mhz Z80).
Have bought a few items from same seller, well priced too, some stuff very cheap (HY29F400BT Flash). Has some other interesting 68000 stuff (68060/68030/68302/68430).
guy was selling them in Tubes of 10
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Re: Microdrive ULA2G007E5
I was going to build something like https://www.tindie.com/products/tindies ... board-kit/Pr0f wrote:I found some 33MHz Z8S18033 - they passed all the test that I can throw at them - and being CMOS - you can run these at 20Mhz too
guy was selling them in Tubes of 10
Z8S18020 is OK for 18.43MHz system, have you tried running them at 36.86MHz? Author of SBC reckons it might be OK.
Re: Microdrive ULA2G007E5
I have it running at 36Mhz in 2 retrobrew boards https://www.retrobrewcomputers.org/doku ... :sbc:n8:n8 and https://www.retrobrewcomputers.org/doku ... 80_mark_iv
and the little pocket computer here: https://www.tindie.com/products/tindies ... puter-kit/
In all cases using the clock doubler feature - so xtal is still 18.432MHz.
Lockdown led me to these things -
and the little pocket computer here: https://www.tindie.com/products/tindies ... puter-kit/
In all cases using the clock doubler feature - so xtal is still 18.432MHz.
Lockdown led me to these things -
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Re: Microdrive ULA2G007E5
36.864MHz cool
Price on microdrive ULA just gone up
Update: But only 9 left...
Price on microdrive ULA just gone up
Update: But only 9 left...