Tag: cpld

Adds two configurable joystick ports, reset control, activity indicators, and an expansion pass-through to ZX Spectrum hardware.

Lotharek marks the interface discontinued and explicitly says it does not work on the Timex 2048. A used unit can contain first-release or later firmware with different mode choices and address decoding, so identify the firmware and test pass-through hardware before relying on it.

Provides ProFile-style block storage from a raw SD card for enhanced Apple IIe and Apple IIgs systems.

The repository publishes binaries, firmware, VHDL, schematics, layout files, Gerbers, and a bill of materials, but no explicit license was verified. Capacity is limited to four 65,535-block volumes, or about 128 MB total. Under ProDOS, programs on the third and fourth partitions have a documented launch problem. This is a build project rather than a current assembled product.

Adds 512 KB of SRAM to an Amstrad CPC 6128 or CPC 6128 Plus through the Z80 CPU footprint.

The Lotharek page exposed a login-or-register-to-buy path on 2026-07-27. The CPU must be removed or desoldered, the module fitted in its place, and the CPU installed on the module. Confirm pin-1 orientation, socket quality, board clearance, and the computer's condition before beginning the invasive installation.

Combines CompactFlash storage, four selectable firmware slots, AY sound, stereo output, and two joystick ports on a ZX Spectrum expansion interface.

The seller exposed a login-or-register-to-buy path on 2026-07-27. Use a CompactFlash card with one active FAT16 partition and remove it only while power is off. The page distinguishes Sinclair and Amstrad bus modes, says the grey +2 is not an Amstrad-mode machine, and explicitly names +2B and +3 for Amstrad mode. It does not clearly establish +2A support, so that model is not attached.

Replaces the Atari FREDDIE memory-management chip with a CPLD module.

Lotharek marks FreddieCPLD discontinued. It is a full replacement for a computer already fitted with a FREDDIE chip, unlike the current Freddy Module v2 companion clock board. Installation requires safe removal of the original chip and correct orientation. The supplied bottom socket can make the module too tall in XE cases; the seller recommends removing it after testing and soldering the module into place. Confirm that the exact motherboard actually uses FREDDIE.

Provides selectable Apple Slinky or RAMFactor-compatible memory using modern low-power SDRAM.

The assembled Tindie card was out of stock on 2026-07-24 and had been sold out since January 23, 2025. Schematics, board files, CPLD firmware, utility software, and fabrication files remain available under the project's dual-license terms.

Open low-power 2 MB geoRAM-compatible expansion cartridge for the Commodore 64.

The assembled Tindie cartridge was out of stock on 2026-07-24 and had been sold out since June 10, 2024. The open design remains buildable. This is geoRAM memory, not an REU: software must explicitly support geoRAM. Most C64 programs use neither expansion-memory type, and GEOS needs an added geoRAM driver on its boot disk.

Adds AY sound, stereo output, joystick and mouse modes, reset controls, and edge-connector pass-through to ZX Spectrum-compatible expansion buses.

The seller exposed a login-or-register-to-buy path on 2026-07-27. The page describes ZX Spectrum and compatible expansion-port use but does not give an exact computer, power, or later-Amstrad compatibility matrix. Human review supplied no readable model-specific evidence, so the record remains only on the shared expansion-bus page. Confirm the intended machine and power off before changing the edge connection or input hardware.

Adds two configurable Atari-style joystick or mouse ports and a pass-through connector to broadly compatible ZX Spectrum expansion buses.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and spells the listing name Kemspton MAX 2. Power the computer off before connecting or removing the interface, joysticks, or mouse. Original Sinclair joysticks are not supported. Human review supplied no readable exact-model matrix, so the record remains only on the shared expansion-bus page; confirm power rails and later Amstrad-model behavior before purchase.

CPLD replacements for failed PLA chips, currently sold for Commodore 264-series computers and previously made for the C64.

The 264-series module exposed a login-or-register-to-buy path on 2026-07-27, while the separate C64 version is discontinued. Human review says the module plugs into the original socket, but the seller does not establish that every supported motherboard is socketed or document the original MOS part, board revisions, orientation, removal, or clearance. Treat it as a plug-in replacement only after confirming a compatible socket and orientation. A used C64 module needs the same checks.

A Xilinx CPLD module replacing specific failed gate-array chips in late ZX Spectrum 48K, 128K, and grey +2 computers.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and gives an unusually precise chip and host list. Neither the page nor human review supplies a removal, socket, orientation, or board-revision procedure. Treat this as skilled rework and obtain exact installation instructions before buying or disturbing the original gate array.

Replaces a socketed 6502 with a W65816 running at up to 10 MHz, backed by fast RAM and programmable flash ROM.

The project publishes Eagle board and schematic files, VHDL and CPLD binaries, test software, and GPLv2-licensed documentation, but no current assembled seller was verified. Revision 1.2b is marked 'ok'; older revisions are prototypes. Building it depends on older Xilinx ISE-era tooling or a compatible programming path, two programmed flash devices, and a socketed host CPU. The author's 10 MHz timing uses 55 ns SRAM outside its rated access time; his burn-in test passed, but builders should not treat that result as a component guarantee.

Adds 4 MB of auxiliary-slot RAM to an Apple IIe in assembled or through-hole kit form.

The current page offered assembled and kit selectors with an Add to cart path on 2026-07-24. This is a complete 4 MB card, distinct from A2Heaven's 64K RamWorks III clone kit.

A revised CPLD ULA replacement for the original ZX Spectrum 128K and grey Spectrum +2.

The seller exposed a login-or-register-to-buy path on 2026-07-27 and explicitly limits this revision to the original 128K toastrack and grey +2. It does not support the black +2A or +2B. ULA removal and replacement is skilled board work; confirm socketing, orientation, current installation instructions, and motherboard condition before starting.

Implements Sound Blaster-compatible audio for Micro Channel systems with OPL2 synthesis and CPLD-managed bus, interrupt, and DMA logic.

Installation requires the supplied ADF and the host reference-disk configuration program. The maker warns against LS or HCT logic because it may not meet Micro Channel timing margins.

Adds SD mass storage to Commodore 264-series computers and can replace the paddle cartridge in a real 1551 drive.

The repository provides Gerbers, firmware, hardware instructions, and release files sufficient for a DIY build. The maker invites requests for a completed unit but does not advertise standing stock. Disk images are read-only, and the device does not reproduce a 1551 exactly. When a TCBM cable is fitted, both specified ground pins must be connected as documented.