J-CIA, J-CIA64. FPGA substitute for MOS 6526 / 8521

2023-08-09 04:07:27

Fashionable spare half for Commodore 64, Commodore 128, SX-64 and 1570/1571 -drives

FPGA primarily based substitute for MOS 6526 & 8521 CIA chips

Full logic and all options of the unique IC’s applied

All diagnostic & software program checks handed 100%, together with all checks in Wolfgang Lorenz’s take a look at suite and Vice-project’s CIA-tests.

[Vice’s ciaports-tests may show partly incorrect results, but then again, original cias show variable results too.]

Tons of of demos and video games already examined, no recognized compatibility points at the moment

Bodily about the identical dimension as the unique CIAs

Plenty of {hardware} examined and located to be appropriate together with (however not restricted to) WifiModem, Final-II+, SD2IEC, TapeCart, 1351-mouse

Examined with all C64 mainboard revisions, SX-64 and with EVO64 mainboard, Commodore 128 (together with CP/M and disk drive burst-mode) and 1570 & 1571.

Works in 1 MHz and a couple of MHz modes.

This 6526/8521 model has been examined to work on a 1581 drive too by a betatester, however full compatibility can’t be assured.

(8520 Amiga -version can be the proper one for 1581)

This “J-CIA64” -version isn’t appropriate with Amiga / 8520-CIA and can’t be later transformed or upgraded to be.

Amiga -compatible model will probably be a separate product that will probably be launched later.

Altering mode between 8521 “new” and 6526 “previous” CIA:

Mode between new (8521) and previous (6526) cia sort might be modified

with a solder jumper on the underside of J-CIA64

“New” 8521 mode is default and 6526-mode might be enabled by soldering

two pads collectively as in the appropriate on the picture beneath:

Normally, the mode does not should be modified,

most sofware and {hardware} are designed to work with each variations.

Set up

Though J-CIA might be soldered on to mainboard, utilizing IC sockets is extremely beneficial.

Pins on J-CIA are gold plated spherical pins, which can work with all types of sockets, however

the pins are a bit thicker than authentic IC-pins, which can trigger slight stress to some leaf-type

sockets. This can be a the identical with all replica IC’s with turned pins.

Watch out when urgent the J-CIA right into a socket and ensure it’s aligned correctly and

pressed down evenly to keep away from bending or breaking of pins.

J-CIA orientation: PIN 1 is marked with a #1 on PCB. That ought to match PIN 1 place on mainboard.

There may be additionally a half circle marked on the highest of the J-CIA. This pertains to the notch on authentic IC’s and the notch on IC-sockets

On a C64 CIA PIN 1 is positioned on high left of the each CIA -locations.

On a C128 the opposite CIA place is “upside-down”, so watch out putting in a brand new CIA the proper approach

Authentic RF-shields might require insulating, modifications and even eradicating.

Earlier than turning on the ability, verify that the RF-shield metallic doesn’t contact J-CIA(s).

Disclaimer

J-CIA / J-CIA64 reproduces the performance of the unique MOS CIA’s

As a result of it is a replica, it can’t be ever absolutely like the unique.

Logic goals to be precisely like the unique, however there could also be variations that haven’t been discovered but.

Electrically J-CIA is “shut sufficient” to the unique CIA, however it’s not precisely the identical.

Though examined with a number of {hardware} and software program, compatibility with all {hardware} and software program can’t be assured.

nstalling the J-CIA64 requires delicate dealing with and taking the right precautions to forestall antistatic discharges.

The vendor or producer can’t be held accountable for any doable harm this product might trigger to your

tools resulting from incorrect set up or mishandling of the product.

Extra information

J-CIAs examined on Retro Recipes youtube -channel: https://youtu.be/EL2HVRtjuIg

The place to purchase?

J-CIA is or will probably be obtainable quickly on the following on-line retailers:

Run Cease Re-Retailer on Retro8bitshop is without doubt one of the largest Commodore 64 spare elements depot on this planet,

with enormous shares of New Outdated Inventory parts, in addition to fashionable options, with quick delivery and top-notch service.

J-CIA at their net store: https://retro8bitshop.com/product/j-cia64/

Run Cease Re-Retailer ships internationally!

Retrospective store could have J-CIA’s in inventory quickly.

https://retrospective.shop/ Retrospective store ships internationally too!

Finnish clients should purchase J-CIA’s at Am-Mek net store at https://shop.am-mek.fi/

Am-Mek ships solely to Finland.

Try additionally: J-VIC / J-CPU / VIDS

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2020-2023 Jani Laatikainen, jani@1nt3r.internet

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